1. Introduction
Fossil fuels are continuously being replaced by greener, sustainable forms of energy with energy storage devices to account for intermittency and efficiency. Rechargeable secondary batteries are suitable for this purpose, and lithium-ion batteries are popular among all reported batteries due to their unique advantages: high energy density, specific capacity, life span, and safety [1,2]. The performance metrics of these batteries are gradually improving to meet the increasing energy demand worldwide. Choosing cathode-active materials (CAMs) is crucial to improving energy density. LIBs use various cathode chemistries with merits and demerits concerning energy density, life span, safety, cost, and other parameters. The most widely researched CAMs broadly belong to three categories: (a) layered oxides; (b) spinel oxides; (c) polyanionic compounds [3]. Polyanionic cathodes such as LiFePO4 (LFP) show good thermal stability due to the strong covalent bond between oxygen and phosphorus. The intrinsic poor electronic conductivity of phosphates is improved by carbon coating [4,5]. Spinel oxides, such as LiMn2O4 (LMO) and LiNi0.5Mn1.5O4 (LNMO), are less expensive due to the absence of costly Co elements and are high-voltage cathodes operating at ~4.7 V vs. Li/Li+. The lack of high-voltage electrolytes, capacity fading, and low specific capacity of spinels have limited their use as commercial cathodes compared to layered oxides [6,7]. Among the ternary layered oxides, LiNixMnyCozO2 (NMC) and LiNixCoyAlzO2 (NCA) are the most common high-energy-density commercial cathode materials for LIBs, especially for e-transportation. NMC is superior to NCA for cost and mechanical and thermal stability. NMC offers a better cycle life compared to polyanionic and spinel cathodes.
Extensive reports on novel synthesis methods of NMC to control morphological and compositional modifications are available in the literature [8,9,10]. The commercialization of NMC as a cathode is at a mature stage, led by Panasonic, Toshiba, and LG Chem. The theoretical capacity of stoichiometric NMC materials is around 275 mAh g−1, but its accessible capacity depends on the material’s transition-metal ions ratio. In the layered transition metal oxide class LiNi1/3Co1/3Mn1/3O2, the Ni-rich cathodes (NMC 811) show higher capacity and operational voltage as Ni is the main active redox species (Ni2+ ⇄ Ni4+). The Ni-rich compounds show poor thermal stability. The role of Mn is to maintain the battery’s excellent cycle life and safety. Co is responsible for the increased electronic conductivity, leading to better rate capability. In a commercial sense, (NMC111 or NMC333) are at a more mature stage as they inculcate all the advantages of the transition metals in the material. For Ni-rich NMC materials, the accessible capacity is much higher than NMC111 but suffers from various degradation processes [11], such as cation mixing [12], surface reconstruction to rock salt [13], phase transformation [14], particle cracking [15,16], transition metal dissolution [17], and parasitic reaction with electrolyte [18].
Another critical factor for excellent battery performance at high voltages is the choice of electrolyte. At higher potentials, i.e., >4.4 V, the electrolyte tends to oxidize, leading to the loss of oxygen from the cathode, increased surface reactivity in the de-lithiated phase, and the dissolution of transition metal from structural instabilities. Among the various strategies, one way to tackle this problem is using electrolyte additives to improve the capacity retention of NMC cathodes. Additives are sacrificial/non-sacrificial species that increase the cathode–electrolyte interface’s stability, reduce interfacial resistance, and control the transition metal dissolution under high operating voltages through protective layer formation at the cathode. Binders are electrochemically inert materials that bind the components of the electrode materials to the current collectors in a coated electrode. The choice of which will impact the performance, cost, and environmental benignness of LIBs. NMC cathode material processing predominantly uses a polyvinylidene difluoride (PVDF) binder with a carcinogenic organic solvent, N-methyl-2-pyrrolidone (NMP). Many efforts have endeavored to replace the expensive, toxic polyvinylidene difluoride (PVDF)–N-methyl-2-pyrrolidone (NMP) binder–solvent combination with more nature-friendly water-based binders (linear polymers, co-polymers, and ion-conducting polymers) to simultaneously improve the electrochemical performances and reduce the manufacturing costs of the aqueous processing of LIBs. The review article focuses on the impact of non-electrode components on NMC cathode to develop and optimize novel functional electrolyte additive systems and polymer binders for commercialization.
2. Electrolytes
Electrolytes are vital in transferring Li+ ions from one electrode to another within a battery. In general, the electrolyte must follow specific characteristic properties, such as:
(1). The viscosity of electrolytes, which influences ionic mobility, should be low (<2 cP);
(2). The high dielectric constant (>20) of solvents helps to dissociate salt;
(3). Ionic conductivity should be high enough with a value greater than 1 mS cm−1;
(4). A wide electrochemical stability window (0.01–5 V vs. Li/Li+) of operation;
(5). Chemical and thermal stability in a wide range of voltage and temperatures;
(6). Inert behavior towards other battery components such as separator, current collector, and packaging materials [19,20];
(7). Environment friendliness, cost-effectiveness, and safety in operating conditions.
Liquid electrolytes are (i) carbonate-based, (ii) ether-based, (iii) ionic liquids and common solid-state electrolytes, (i) inorganic solid-state, (ii) gel polymer, and (iii) solid polymer.
2.1. Non-Aqueous Solvents
2.1.1. Carbonate Solvents
Commercial batteries mainly use carbonate-based solvents as electrolytes. The physical properties of different carbonate solvents are given in Table 1. Carbonate esters can be divided structurally into cyclic carbonates (Propylene Carbonate (PC), Ethylene Carbonate (EC)) and linear carbonate (Dimethyl Carbonate (DMC), Ethyl methyl Carbonate (EMC)). A mixture of electrolytes optimizing the viscosity, salt-dissociation, solvation/de-solvation energies, and salt conductivity is the current norm in LIBs. EC: DMC mixture synergistically combines the high anodic stability of EC, a high dielectric constant of EC, and low viscosity of DMC. DMC can be substituted by other linear carbonates solvents such as Diethyl Carbonate (DEC) and Ethyl Methyl Carbonate (EMC). EMC can undergo a transesterification reaction and lead to the formation of DEC and DMC, whereas EC gives oligo-carbonates [21,22,23]. Fluorinated carbonates such as Fluoroethylene Carbonate (FEC) and 4,5-Difluoro-1,3-dioxolan-2-one (DFEC) [24,25] are effective SEI-forming additives or co-solvents. These fluorinated compounds face various types of challenges, such as high melting points and viscosity.
2.1.2. Ether Solvents
In the 1980s, ethers were chosen as possible alternative solvents because of their low viscosity, high ionic conductivity, and stability during cycling. Some of the well-known ethers are tetrahydrofuran (THF), 2-Methyltetrahydrofuran (2-Me-THF), 1,2-dimethoxyethane (DME), Polymethoxy ethers, dimethoxy propane, and diethyl ether [19,30]. Ether-based solvents have oxidation stability < 4 V but provide excellent stability with Li metal electrodes. It oxidizes when the CAMs are high-voltage cathode materials (LixMO2, M = Mn, Ni, or Co). Despite such demerits of ether solvent, a high-concentration ether-based electrolyte (LiFSI/DME) performs well in an NMC/Li-metal full cell with a capacity retention of 92% after 500 cycles at 4.3 V [31]. Ren et al. reported a localized high-concentration electrolyte (LHCE), creating an effective protective interface layer upon Ni-rich cathode material [32,33]. Again, adding some carbonate-based additive (EC or FEC) helps improve battery performance [34]. A new class of fluorinated ethers with high ionic conductivity and oxidative stability contributes electrochemical stability to Ni-rich NMC for around 100 cycles [35].
2.1.3. Other Solvents
Phosphorous-based organic solvents are used as non-flammable co-solvents to prevent fire hazards, mainly due to the radical propagation mechanism. Recently, they have been used to enhance the anodic stability of high-voltage cathodes by reducing flammability. The high viscosity of solvents makes them unfavorable to use because they lead to low ionic conductivity and wettability toward separators and electrodes. The phosphorus-based solvents, in combination with carbonates or ethers, can cope with high-viscosity problems [36,37,38,39,40].
Alkyl sulfones are another suitable option as a solvent because of their low flammability and excellent anodic stability. High melting points and high viscosity can be an issue that hinders them in commercial applications. They are suitable for high-voltage and high-energy-density Li-ion batteries [41,42,43,44].
2.2. Lithium Salts
LiPF6 is indispensable as Li salt because of its well-balanced properties in all the commercialized LIB electrolyte systems [45]. The improvement of the salt is taken into account at the expense of anodic stability as it gets easily oxidized on the charged surface of cathode materials below 4.0 V vs. Li/Li+. Most salts can fulfill the solubility requirement by using a complex anion formed by stabilizing the anion core with a Lewis acid agent. In LiPF6, F− ion is stabilized by Lewis acid PF5. The anionic charge is well distributed by an electron-withdrawing Lewis acid ligand, and the salts have a low melting point and are readily soluble in low dielectric media. Milder Lewis acid-based salts such as LiClO4 and LiMXn (M = B or As, P, and Sb and X = F or O and n = 4 or 6) are frequently used at lab-scale levels. The physical properties of lithium salts are tabulated in Table 2.
LiPF6 is very sensitive to both moistures, even at low ppm levels, and decomposes at ~70 °C, which restricts its applications and causes safety issues. The proposed reaction scheme [46,47] of LiPF6, with residual moisture is
LiPF6 → LiF + PF5(1)
PF5 + H2O → 2HF + POF3(2)
The interaction of PF5 with organic carbonate solvents can accelerate the formation of HF. HF can easily react with the delicate NMC surface, leading to the loss of active Li+ and even accelerating the dissolution of transition metal ions (TMs). To an extent, insulator coatings, such as SiO2, can limit HF from reacting with the electrode material. The schematic (Figure 1) shows HF formation and SiO2 protection with LiPF6 salt. To substitute LiPF6, other chemically stable salts, such as LiBOB [48], lithium bis(fluorosulfonyl)imide (LiFSI) [49], lithium 4,5-dicyano-2-(trifluoromethyl) imidazolide (LiTDI) [50], and lithium difluoro(oxalato)borate (LiDFOB) [51,52], have been reported.
2.3. Dual-Salt-Based Electrolytes
Dual-salt electrolytes were extensively researched to replace LiPF6-containing electrolytes for high-voltage cathodes. The conventional LiPF6 carbonate-based electrolyte results in a poor SEI layer formation, consisting of many resistive decomposition products of LiF and Li2CO3 and other inorganic and organic by-products. Dual-salt electrolytes can replace LiPF6-containing electrolytes with no highly resistive LiF in the SEI layer. A dual-salt electrolyte of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and lithium bis(oxalato)borate (LiBOB) in a carbonate solvent mixture (Figure 2b) [53,54] or using LiPF6 as an additive [55] in electrolytes results in the improved performance of full cells with NMC as the cathode and Li metal as the anode. High-voltage cathodes with Li metal as the anode in these electrolytes showed an areal capacity of 1.75 mAh cm−2 after 450–500 cycles at a current density of 1.75 mA cm−2 [54,55]. There are other dual salts reported in the literature, such as LiTFSI-LiDFOB(lithium difluoro(xalate)borate), LiFSI (lithium bis(fluorosulfonyl)imide)-LiDFOB, and LiFSI-LiDFOB. The cycling stability of the Li metal batteries with these electrolytes grades in the following order: LiTFSI-LiBOB > LiTFSI-LiDFOB > LiFSI-LiDFOB > LiPF6 > LiFSI-LiBOB, which is in good accordance with the density functional theory (DFT) calculation results (Figure 2a) [54].
Recently, Zheng et al. confirmed 300 cycles of stable cycling of Li/NMC with an areal capacity of 0.9–4.1 mAh cm−2 with the limitation of discharge current 2 mA cm−2 and a charge current density of around 1 mA cm−2 in a LiPF6-assisted LiTFSI-LiBOB dual-salt EC-based electrolyte [56]. Dual-salt is also reported in ether electrolyte solvent through ether oxidizing easily by highly catalytic cathode surface at lower potentials (<4 V). The concentrated ether-based electrolyte containing 2 M LiTFSI and 2 M LiDFOB in DME increases the oxidation stability of ether molecules. This dual salt also passivates the NMC cathode surface at high voltage and forms a better SEI layer on the Li metal anode, resulting in a long Li/NMC full cell lifetime. It shows more than 90% capacity retention after 300 cycles and ~80% after 500 cycles with an upper cut-off voltage of 4.3 V [57].
2.4. Additives
Additives without an effect on the skeletal composition of the electrolyte result in specifically targeted properties in a very efficient and economical way. The electrolyte’s bulk properties persist as the additive forms only <5 wt% of the electrolyte. Additives are sacrificial and form a protective layer during the initial activation cycles. Usually, a solid electrolyte interface (SEI) layer-forming additive is crucial for Li metal or graphite anodes. Vinylene carbonate (VC) or 1,3-Dioxol-2-one is one of them, with a strained cyclic alky carbonate with a polymerizable double bond improving the cycle life and thermal stability of different Li-ion systems [58]. Recently, it has also shown beneficial effects on the positive electrode. Burns et al. studied the role of VC in varieties of Li-ion cells by changing the content of the additives [59]. 1–2% of VC can improve battery life and reduce cell impedance. Another group studied the effect of VC in the cycling stability of LiNi0.5Mn0.3Co0.2O2 (NMC532)/graphite cell at a high temperature. The addition of 1% VC suppresses the formation of undesirable decomposed products [60].
LIBs have used Fluoroethylene carbonate (FEC) as an additive to improve the battery metrics. An FEC-induced SEI layer is more stable and conductive. It regulates the uniform Li stripping and platting and enhances the cycle performance of Li/NMC cells. FEC leads to the formation of LiF-containing components on Li metal anodes. This LiF-rich SEI is efficient and effective in subduing dendrite formation on Li metal. Zhang et al. presented a stable cycling of Li/NMC532 cells with an areal capacity of 1.9 mAh cm−2 at a current density of 2.16 mA cm−2 for about 100 cycles with 5% FEC in EC-based electrolyte solution [61]. Aurbach group demonstrated the performance of Li/NMC622 in different current densities of 0.5–2 mA cm−2 with 33 µL cm−2 FEC-based electrolyte, and at 1.5 mA cm−2, the cell shows an areal capacity of about 2 mAh cm−2 after more than 600 galvanostatic cycles [62]. Im et al. demonstrated a fluorinated electrolyte (1 M LiPF6 fluoroethylene carbonate (FEC) and methyl (2,2,2-trifluoroethyl) carbonate (FEMC) (FEC/FEMC = 1/9, v/v)) for LiNi0.5Mn0.3Co0.2O2/graphite system at 4.5 V [63]. FEC can be used with other co-additives LiPO2F2 to suppress electrolyte decomposition and transition metal dissolution during cycling [46]. Both produce a stable cathode–electrolyte interface (CEI) layer on the cathode. (Figure 3).
Tris (trimethylsilyl) phosphite (TMSPi), which tends to decompose and form the CEI layer at the cathode–electrolyte interface, is another exciting additive used in NMC chemistry. This layer prevents excessive electrolyte decomposition, transition metal dissolution, and other parasitic side reactions. Mai et al. demonstrated that TMSPi was responsible for improving the cycling performance and rate capability of an NMC electrode by forming a stable and less resistive surface film due to oxidation on the cathode surface [64]. The combination of TMSPi and VC improves the long-term cycling performance of NMC111/graphite cells [65,66]. Adding 1% TMSPi and 1% VC in a standard electrolyte consisting of 1 M LiPF6 in EC: DMC (1:1 vol.) increases the capacity retention of NMC811/graphite full cell to 91% after 200 cycles at C/3 [67]. Peebles et al. compared the capability of TMSPi with structurally analogous electrolyte Triethyl Phosphite (TEPi) in NMC532/graphite full cell and proposed a mechanism for oxide film formation on the surface (Figure 4) [68].
Sulfur-containing additives are also very popular for enhancing the battery lifetime, regulating impedance growth, and suppressing gas production, especially when combined with other additives. Better coulombic efficiency with lower impedance and reduced voltage drop can be obtained using 1,3,2-dioxathiolane-2,2-dioxide (DTD) and tetramethylsulfone (TMS) additives [69]. During the formation cycles, DTD and TMS generate gases but suppress gas generation in combination with VC. Prop-1-ene-1,3-Sultone (PES) also improves the performance of NMC111/graphite in the presence of VC with less gas production and an increase in cell impedance [70,71]. A ternary mixture of PES, 1, 5, 2, 4-dioxadithiane-2, 2, 4, 4-tetraoxide (MMDS), and TMSPi or VC, MMDS, and TMSPi can yield improved battery life and excellent safety [65,72,73].
The main boron-containing additives reported for NMC cathode is lithium bis(oxalate)borate (LiBOB) [48,74]. LiBOB leads to the formation of a stable SEI on graphite, resists the unfavorable reactions of the electrolyte with high-voltage positive electrodes and also improves capacity retention. The cell impedance increase issue faced by LiBOB can be limited by adding triphenylamine (Ph3N) or 1,4-benzodiozane-6,7-diol (BDOD). The low oxidation potential of LiBOB and BDOD can protect the cathode surface by producing stable conducting polymer through the radial polymerization process [75]. Lithium difluoro(oxalato) borate (LiDFOB) is also used with LiBOB to improve cell performance by passivating the electrode surface against electrolyte decomposition and transition metal dissolution [76]. LiDFOB in a carbonate-based electrolyte (with fluorinated ether as diluent) showed capacity retention of 84% of LiNi1/3Mn1/3Co1/3/Li cell after 100 cycles [77].
Lithium Difluorophosphate (LiDFP) became a good additive for high-voltage NMC cathodes [78]. It is one of the decomposition products of LiPF6. Wang et al. demonstrated using 1 wt% of this additive in conventional carbonate-based electrolytes for a high-voltage LiNi1/3Mn1/3Co1/3O2/graphite pouch cell at 4.5 V [79]. The capacity retention of the cell increased notably to 92.6% after 100 cycles and 78.2% after 200 cycles. A full cell— a LiNi0.5Co0.2Mn0.3O2/graphite pouch cell—at 4.5 V showed capacity retention of 93.8% after 100 cycles, and its discharge capacity obtained around 118.9 mAh g−1 at 5 C [80]. The Yang group also conducted a low-temperature evaluation of LiDFP on NMC532/graphite [81]. The additive improves initial capacity by 71.9% at −20 °C and 57.93% at −30 °C, improving capacity retention by 16.8% at 0.5 C after 100 cycles at 0 °C. Recently, another electrolyte additive, Tripropargyl Phosphate (TPP), was reported in the literature, which produces a protective interface layer upon both positive and negative electrodes [82].
2.5. Ionic Liquid Electrolytes
Ionic liquid electrolytes were chosen as an alternative to conventional carbonate electrolytes for their superior properties, such as wide electrochemical windows, low volatility, and non-flammability [83,84]. They are low-temperature molten salts comprised of cations and anions without any molecular species. Two types of ionic liquid (IL) based electrolytes are often identified as (i) purely ionic electrolytes (mixture of an IL and a lithium salt) and (ii) IL-organic solvent(s) blends (mixtures of an IL, a lithium salt, and co-solvent(s)). The cyclic or linear carbonate co-solvent improves the solution’s transport properties (viscosity and ionic conductivity). Chaudoy et al. demonstrated the use of room-temperature ionic liquid (RTIL)-based electrolytes in improving Li/NMC full cell compared to conventional electrolytes. RTILs mentioned in their literature are N-butyl-N-methylpyrrolidinium bis(fluorosulfonyl)amide(P14FSI) and N- propyl- N- methylpyrrolidinium bis(fluorosulfonyl)amide(P13FSI), and LiTFSi was the salt. A reversible capacity of about 145 mAh gm−1 at C/10 and 110 mAh gm−1 at C with approximately 100% coulombic efficiency for these electrolytes in Li/NMC full cell [85]. Matsui et al. reported the ionic liquid-based electrolyte (mixture of EMIMFSI and LiTFSI), which gave a reversible capacity of 163 mAh gm−1 in a full cell with an NMC cathode [86]. Passerini et al. showed the improvement of cycling behavior for Li/NMC half-cells at different temperatures (Figure 5a).
The effect of organic solvents on the aluminum dissolution and rate performance of an NMC cathode to improve the electrochemistry were analyzed. The electrolytes used are based on a blend of P13FSI and 1.2 mol·L−1 LiFSI or P13FSI, 10 vol% (or 50 vol%) EC: EMC (1:2 wt.) and 1.2 mol·L−1 LiFSI (Figure 5b) [88]. Reiter et al. also reported using PP13TFSI and LiFSI or LiTFSI as electrolytes for graphite anode and NMC cathode. They also showed that graphite could produce a discharge capacity of 340–345 mAh·g−1 at a C/10 rate with a coulombic efficiency of 97–98%, and NMC cathode material can produce a discharge capacity of 160 mAh·g−1 with coulombic efficiency above 99% [49].
2.6. Solid-State Electrolytes
Conventional liquid electrolyte-based battery brings safety issues due to perennial problems such as dendrite formation on the lithium anode, electrolyte leakage, fire, and explosions [89]. Solid-state electrolytes are critical in limiting the usage of volatile organic electrolytes.
2.6.1. Inorganic Solid-State Electrolytes
Kato et al. reported the oxide-based solid electrolyte (Ox-SSB) Li/LLZ/NMC-LATP composite film shows good capacity retention of about 99.97% after 90 cycles at a C/10 rate at 100 °C [90,91]. There is an aerosol deposition technique to synthesize the composite films and a thick composite of crystalline NMC and amorphous solid electrolyte Li-Nb-O at room temperature. Another method to infuse solid electrolytes on electrodes is an atomic layer deposition coating of Li3PO4, a solid electrolyte, on Ni-rich NMC to reduce the capacity and voltage fading mechanisms [92]. Alexander et al. reported surface-modified garnet structured solid electrolyte Li6.28Al0.24La3Zr2O12 (LLZA), which leads to an initial capacity of 162 mAh g−1 at 50 µA cm−2 [93]. Philip et al. introduce lithium phosphorus oxynitride (LiPON) electrolyte, which reduces the degradation of the NMC622/LiPON interface and helps in stable cycle performance [94]. Figure 6a,b show a better specific capacity for LiPON than the conventional electrolyte.
2.6.2. Gel Polymer Electrolyte
Gupta et al. reported a polymer electrolyte that contains polyethylene oxide (PEO), LiTFSI, and IL (ionic liquid). The cell containing this electrolyte and NMC622 as a cathode gives a specific discharge capacity of 137 mAh g−1 [96]. Goodenough and his members investigate the reason behind the degradation of PEO-based electrolytes with the help of an in situ scanning electron microscope [97]. Kobayashi et al. explained the decomposition of polymer electrolytes and the utilization of a CMC binder to suppress such degradation, leading to better performance [98].
2.6.3. Solid Polymer Electrolyte
The inorganic solid electrolyte has high Li+ ion conductivity and a wide electrochemical stability window but with a poor and unstable interface of a Li anode or different electrodes, whereas a polymer electrolyte offers a stable interface. Goodenough et al. reported NASICON/polymer electrolyte, which gives good cycle stability (100 cycles) of Li/NMC811 at 40 °C [99]. Manthiram et al. designed a dual polymer/polymer–ceramic composite electrolyte (LDPPCCE) with an ionic conductivity of 1.31 × 10−4 S cm−1 at room temperature (Figure 6c) [95].
3. Binder
The choice of binder in LIBs is critical because of its ability to control the density, porosity, and thickness of the coated cathode slurry, and it should (1) have a wide electrochemical window (0–5 V), (2) be nonreactive with other cell components, and (3) be easily soluble in appropriate aqueous and non-aqueous solvents. Polyvinylidene fluoride (PVDF) is one of the most widely used binders that dissolves in an organic solvent such as N-methyl-2-pyrrolidone (NMP) [100,101]. NMP solvent is expensive, toxic, and not eco-friendly. Carboxy Methyl Cellulose (CMC) is a well-known binder in an aqueous solvent that is less expensive and eco-friendly [102]. In recent binder progress, another cheap and natural binder is reported, which is known as alginate, extracted from brown algae [103]. J. Xu et al. thoroughly investigated the effect of all three different binders in the case of NMC111. Figure 7 illustrates that CMC mixed with NMC shows higher cyclic performance than PVDF and alginate [104]. Aqueous binder CMC in an NMC/graphite full cell offers a coulombic efficiency of 99.96% and capacity retention of 70% after 2000 cycles [105]. CMC binder was also used with an NMC442 cathode, producing better stability than PVDF [106]. Another water-soluble binder, polyacrylic latex (LA132), exhibited higher capacity, improved cycle stability, and better rate performance than CMC and PVDF [107]. One issue with using a water-based binder for NMC is that it increases the pH value to 11 and leads to corrosion to the Aluminum (Al) substrate. Adding components (γ-Al2O3 or SiO2) or acids (phosphoric acid or formic acid) that increase the pH of the suspension can rectify the problem to a more considerable extent [108,109,110]. M. Wood et al. explored nickel-rich NMC in aqueous slurry preparation for electrodes and showed structural stability with comparable capacity retention (70% after 1000 cycles) [111]. Without adding any additive to the aqueous slurry, Poly(acrylic acid) (PAA) can act as a successful binder for NMC811 without any corrosion of the Al current collector and can produce an initial capacity of 189.2 mAh g−1 at a 0.2 C rate [112]. Brilloni et al. introduced a new biodegradable polymer known as pullulan, which helps in the easy recovery of cathode material after its use [113]. Apart from conventional PVDF and a water-soluble binder such as CMC, a new family of ionic conductive polymers, such as poly (ionic liquids) (PIL), was introduced in the world of binders. One of the popular PIL binders is poly(diallyldimethylammonium) (PDADMA) with various types of anionic species of ionic liquid attached to it. Vauthier et al. studied PIL on high-voltage NMC532 and produced improved capacity with fluorinated PDADMA [114]. The physical properties of popular NMC binders.are tabulated in Table 3.
4. Anodes for NMC-Based Battery
A compatible anode is also a vital factor for NMC cathode-based LIBs. Commercially, graphite is the most desirable anode due to its considerable specific capacity (372 mAh g−1), low cost, low operational potential (0.1 V vs. Li/Li+), high electronic conductivity, uniform SEI formation, and long cycle life [115]. Another negative electrode that shows a high theoretical capacity of 3860 mAh g−1 is the lithium metal anode. The perennial dendrite formation on a lithium metal anode and its safety issues restrict its use in commercial LIBs [116]. The SEI layer formation on the anode was avoided with a higher lithium intercalation potential anode such as Li4Ti5O12 (LTO) [117]. It shows a low theoretical capacity (175 mAh g−1) compared to graphite and lithium metal and a lower energy density due to the lower operating voltage in a full cell. Björklund et al. reported the impact of the different anodes on the electrochemical performance of NMC111 [118]. Li metal-based full-cell capacity fading is more significant than graphite and LTO-based anode cells. Fang et al. also studied the effect of the anode on the cathode interface layer [119]. The studies indicate that NMC/graphite and NMC/LTO give us better cycle stability than NMC/Li. The higher operational potential of LTO (1.55 vs. Li/Li+) compromises the energy density of the full cell compared to graphite. Figure 8 shows the energy density of NMC full cells in combination with the different anodes.
5. NMC Compositions
LiNixMnyCozO2 (x + y + z = 1) (NMC) are very popular as transition metal oxide cathodes. The percentage of elements present in the composition can vary in physical and chemical properties. The content of Ni governs the specific capacity of the material, i.e., the higher the percentage of Ni, the higher the capacity will be. Figure 9a presents the ternary diagram of different compositions of NMC with specific advantages of each element. Figure 9b represents the gravimetric and volumetric energy densities of different NMCs. Ni can show redox reactions of Ni2+ ↔ Ni3+ ↔ Ni4+ during the charge/discharge process; the capacity and safety are a tradeoff while designing the electrode composition. The content of Mn can improve the safety factor, while Co enhances the kinetics of the material.
5.1. LiNi1/3Mn1/3Co1/3O2 (NMC111)
NMC111 is considered the most commonly used commercial cathode with a theoretical capacity of 278 mAh g−1 with an operating voltage of 4.3 V. Table 4 summarizes all the electrolyte and additive combinations for NMC111. Ohzuku et al. first reported the solid-state synthesis of this material and obtained 150 mAh gm−1 of capacity with 1 M LiPF6 in EC: DMC (3:7, v/v) within a voltage range of 2.5–4.2 V [120]. Moreover, 0.5 wt% of Tris(trimethylsilyl) phosphite (TMSPi) as an additive can push the upper cut-off voltage to 4.5 V [64]. Other linear carbonate electrolytes, such as DEC and EMC, are also used along with EC to reduce viscosity. For example, 1 M LiPF6 in EC: EMC (3:7, w/w) (commonly known as LP57) is most commonly used by prominent research groups. Gasteiger et al. used LP57 to study the effect of upper cut-off voltage (UCV) on NMC111/graphite [14]. The highest specific capacity of 183.4 mAh g−1 was achieved at 4.6 V but with poor capacity retention, whereas, at 4.4 V, the capacity was well maintained for 295 cycles at 1 C. Adding different electrolyte additives such as VC, PES, MMDS, DTD, TTSPi, and TTSP with a control electrolyte improves the cycling performance of an NMC/graphite pouch cell at various temperature ranges [65,72,121]. Ternary electrolyte solvent systems along with additives such as 3,3′-(ethylenedioxy)dipropiononitrile (EDPN), 3,3′-(sulfonyl)dipropionitrile (SDPN) and di(methylsulfonyl) methane (DMSM) at UCV of 4.6 V show higher cathode voltage performances [122,123,124]. Boron-based additive trimethyl boroxine (TMB) with 1 M LiPF6 in EC, DEC, and DMC enhances the cycle stability from 40% to 99% after 300 cycles at a 1 C rate [125]. Apart from carbonate electrolytes, thermally stable cyano-ester solvents with 1 M LiTFSI salt and 3 wt% FEC perform well in the full cell [126].
5.2. LiNi0.4Mn0.4Co0.2O2 (NMC442)
Ni-rich NMC cathodes (NMC442) are cheaper by reducing the compound’s cobalt amount, allowing for a charge potential of 4.7 V without any structural changes. The conventional electrolyte starts to degrade over the positive electrode above 4.3 V. All the electrolyte–additive combinations for NMC442 are tabulated in Table 5. Aiken et al. performed NMC442/graphite pouch cells at higher voltage (>4.2 V) in different temperature conditions and observed less gaseous product formation with 2 wt% PES additive in baseline electrolytes [134,135]. Nelson et al. studied the impedance growth of full cells after long-term cycling and reduced them with appropriate electrolyte additives [136]. The ternary mixture of additives such as PES211 is beneficial in mitigating impedance growth and retains its capacity up to 85% after 500 cycles at 4.4 V under 45 °C [72,137]. Petibon et al. tried to develop a new electrolyte combination free of EC that works better in all required electrochemical aspects [138]. Fluorinated electrolytes and 1 wt% PES showed better cycle stability of about 80% than binary and ternary additives-based EC: EMC (3:7, v/v) electrolytes [139]. As a high-voltage electrolyte, EC co-solvent can be replaced by sulfolane (SL), which has high anodic stability [140]. Rong and his co-workers have studied ternary electrolyte combinations and Tris (trimethylsilyl) phosphate (TMSP) as an additive for an NMC422 full cell, and it exhibited better rate performance [141].
5.3. LiNi0.5Mn0.3Co0.2O2 (NMC532)
Liu et al. applied one of the most popular additive VCs in an NMC532/graphite full cell and tested it at an elevated temperature. VC-containing electrolyte cells produce fewer decomposition products than free ones [60]. A fluorinated additive such as FEC was studied in a Li metal battery and performed excellently [61]. Table 6 summarizes all the electrolyte additive combinations with NMC532. Phosphorus-containing electrolyte additive tris(trimethylsilyl)phosphite (TMSPi) and triethyl phosphite (TEPi) produce a protective surface film on the cathode side [68]. Salt-type additives such as lithium difluoro phosphate (LiDFP) are quite popular in Ni-rich cathode-based full cells with graphite as an anode at various temperatures [80,142]. Zuo et al. exhibited lower impedance due to interfacial modification by adding only 1 wt% of LiBF4 in the baseline electrolyte [143]. A novel electrolyte additive, N, O-bis(trimethylsilyl)-trifluoroacetamide (NOB), is a nitrogen and silicon-containing compound that acts as an HF scavenger sacrificial additive [144]. Dimethyl sulfite (DMS) is a sulfur-containing electrolyte additive that performs under low temperatures of −10 °C and outperforms commercially available additives [145]. Zuo et al. retained about 92.3% of initial capacity by adding 0.5 wt% of tris(trimethylsilyl)borate (TMSB) due to forming a thinner film on the surface [146]. Adding 1,10-sulfonyldiimidazole (SDM) can improve the electrochemical performance at high voltages [147]. The modified version of DTD, namely [4,4′-bi(1,3,2-dioxathiolane)] 2,2′-dioxide (BDTD), is also developed as a cathode additive, which improved the cycle retention up to 91.6% [148]. Shi and his co-workers used the synergistic effect of lithium sulfide (Li2S) salt and acetonitrile (AN) solvent additive and developed a stable cathode–electrolyte interface (CEI) layer, which reduced the electrolyte decomposition [149].
5.4. LiNi0.6Mn0.2Co0.2O2 (NMC622)
NMC622 is a more recent material than other matured NMC cathodes, and commercialization needs further modification. The advantage of increased energy density with Ni content attracts commercialization and reduces battery pack costs. Electrolyte additives or solvents that are stable at the upper cut-off voltage need to be developed to utilize the full potential of NMC662. The electrolyte optimization in a combination of solvents and additives for NMC622 is detailed in Table 7. Gasteiger et al. performed testing of NMC622/graphite full cells with different upper cut-off potential and temperature conditions to observe oxygen release due to electrolyte decomposition [154]. Small amounts of 1,4-phenylene diisocyanate (PPDI) acted as HF and H2O scavengers and film-forming additives over the NMC622 cathode surface in pouch cells and exhibited long-term cyclability at a 1 C rate [155]. Liao et al. introduced a new kind of additive, namely 1-(2-cyanoethyl) pyrrole (CEP), which suppresses HF formation from cycling at high voltages [156]. Hexamethylene diisocyanate (HDI) [157] and 4-propyl-[1,3,2]dioxathiolane-2,2-dioxide (PDTD) [158] in 1 M LiPF6 in EC: EMC (1:2, w/w) can reduce the interfacial impedance and increase cycling performance. Functional additives such as (3-(N, N-dimethylamino) diethoxypropyl) pentamethyldisiloxane (DSON) [159], p-toluenesulfonyl fluoride (pTSF) [160], triisopropyl borate (TIB) [161], diphenyldimethoxysilane (DPDMS) [162], 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetra- siloxane (ViD4) [163], 3-hexylthiophene (3HT) [164], and tris(hexafluoroisopropyl)phosphate (THFP) [165] are assigned with different roles, such as film-forming ability, HF scavenger, gas-suppressing agent, and thermal safety.
5.5. LiNi0.8Mn0.1Co0.1O2 (NMC811)
Another Ni-rich NMC, NMC811, is also quite popular in battery research labs due to its high specific capacity of 200 mAh gm−1 at 4.3 V and low cost (less cobalt). However, its low cycling stability at high voltages and inferior safety issue makes it a poor choice for a commercial approach. An optimized combination of electrolytes with its additives enhances the performance of NMC811 with both graphite and lithium metal anodes. The battery metrics of NMC811 with various electrolyte–additive combinations are tabulated in Table 8. Gasteiger et al. studied oxygen release and cycle stability in NMC811/graphite full cells at different end-of-charge potentials [14]. A combination of VC and TMSPi additives in 1 M LiPF6 in EC: DMC (1:1, v/v) enhances the capacity retention and achieves 91% after 200 cycles [67]. The addition of triphenylphosphine oxide (TPPO) to the baseline electrolyte improves the cell’s first coulombic efficiency and specific capacity [170]. Lan et al. proposed a new additive, phenyl trans-styryl sulfone (PTSS), which builds a stable interfacial film on the surface during the charge–discharge process [171]. The multifunctional film-forming additive, 4-fluorobenzene sulfonate (PFBS), constructs a stable interface layer on both positive and negative electrodes and protects the electrolyte solvent from decomposition and structural degradation [172]. Adiponitrile (ADN) is a nitrile group that contains additives favorable for high-voltage performance and low flammability [173].
3,3-diethylene di-sulfite (DES) forms a stable protection layer on the cathode surface and assists in the Li+ ion extraction/insertion process [174]. Cheng et al. proposed binary additives, which are comprised of lithium difluoro(oxalato)borate (LiDFOB) and tris(trimethylsilyl)phosphate (TMSP), and checked their capability in both half-cell and full-cell and even in the commercial pouch cell at different conditions. The synergistic effect of both additives produces B-, Si-, and F-rich interface layers, which protect electrolyte decomposition, gas formation, and the cathode from structural degradation [175]. Film-forming additives such as tris(trimethylsilyl)borate (TMSB) [176], triphenyl phosphate (TPPa) [177], phenyl vinyl sulfone (PVS) [178], and 2,4,6-triphenyl boroxine (TPBX) [179] are also reported in NMC811-cathode-based Li-metal batteries. Multifunctional organic electrolyte additives such as ethoxy(pentafluoro) cyclotriphosphazene (PFN) [180] and trimethylsilyl trifluoroacetate (TMSTFA) [181] act as both the HF/H2O scavenger and the stable CEI layer-forming agent. Hu et al. reported a functional electrolyte additive, cyclopropane sulphonic amide (CPSA), combined with ether electrolyte to improve electrochemical properties [182].
6. Single-Crystal NMC
Commercially available NMC cathodes are poly-crystalline. Polycrystals are secondary particles with many nano-sized primary particles. Significant challenges experienced by polycrystal cathodes are cathode–electrolyte interface (CEI) layer formation, cation disordering, micro-cracks formation, and evolution of gaseous product during continuous cycling [183,184]. Single-crystal NMC (SC-NMC) synthesis can be a cutting-edge approach to mitigate all of these problems. The advantages of single-crystal NMCs compared to polycrystals (PCs) are a longer cycle life, high-voltage stability, higher volumetric energy density, less stress crack formation, less unwanted interfacial reaction, controllable crystal facet orientation, a low amount of gas formation, and higher mechanical and thermal stability [185,186]. The absence of intergranular stress micro-cracks originating from the phase change helps improve cyclic performance. The packing density is higher for SC-NMC due to the excellent distribution of primary particles, facilitating higher volumetric energy density. However, there are similarities in synthesis methods for polycrystals and single crystals due to the matching crystal growth process with SC-NMC requiring more synthetic control for particle morphology, size, and dispersion. The sintering process involves conventional solid-state and molten salt methods. For SC-NMC, the solid-state method is more widely accepted commercially for SCs and requires higher sintering temperatures and excess lithium sources than PCs with a secondary sintering process in the case of the agglomeration of the particles. The molten salt method generates uniform crystal growth at relatively low temperatures in a molten salt medium. The method has the following challenges for large-scale production: (i) volatilization of molten salt, (ii) cost of the salt, (iii) post-washing, and (iv) post-heat treatment. The need for an excess lithium salt source and tedious heat treatment is another common problem for both SCs synthesis methods and affects the production cost for industrial applications.
Dahn’s group has extensively studied single-crystal NMC532 by optimizing it with different electrolytes and other testing conditions to obtain stable cycles (5000) for pouch cells [187,188]. Dahn et al. reported cathodes with nickel-rich content (Ni ≥ 0.6) to increase energy output [189,190,191]. NMC6.5:2.5:1 is an optimized composition due to higher capacity retention above 4.2 V, favorable specific capacity, and less reactivity with electrolytes at temperatures ~40 °C [192]. The demerits associated with SC-NMC are kinetic limitation of lithium diffusion, cation disordering during high-temperature sintering, intragranular micro-cracks formation, and unwanted parasitic reactions at the cathode–electrolyte interface at a high voltage or temperature [189,193,194,195,196,197]. Different modification strategies such as surface coating, elemental doping, morphology regulation, and electrolyte system optimization with additives are applied to mitigate all problems that directly or indirectly affect their electrochemical performances.
PVDF binder with NMP solvent is the most commonly reported binder for single-crystal cathode materials. Electrolytes with different functional additives help build protective layers on cathode surfaces. Table 9 summarizes all the data of SC-NMC with varying types of electrolyte systems and additives. Apart from the liquid electrolytes, some researchers have also studied the capability of SC-NMC in solid-state lithium-ion batteries [198,199,200,201,202,203]. Wang et al. obtained an almost 30 mAh g−1 higher capacity at a C/10 rate for SC-NMC532 compared to the polycrystalline one, and the capacity gain increases with higher current densities. A higher lithium diffusion coefficient is also responsible for better rate performance [204]. Crystal morphology and facet modifications can improve the solid-state battery performance by providing better contact and a smooth 3D lithium-ion diffusion pathway. The octahedral crystal morphology of NMC622 with exposed (012) facets shows superior rate capability compared to other morphological counterparts [205]. A polymer-composite-based electrolyte is also used with LiNi0.6Mn0.1Co0.3O2 (NMC613) to alleviate intergranular crack formation during cycling [206]. Further modification of the Ni-rich cathode with a surface coating of Li1.4Al0.4Ti1.6(PO4)3 (LATP) decelerates structural degradation and stabilizes cycling performances [207].
7. Commercial Aspects of NMC
Over the past few decades, electric vehicles have boomed with lithium-ion batteries that have high energy contents of 260 Wh kg−1 or 700 Wh L−1 at the cell level and higher efficiencies (>99%) [240]. The cathode seems critical in achieving these energy densities with high reversible specific capacities and discharge potentials vs. Li/Li+. Table 10 represents cell chemistry present in different electric vehicles with their specifications. The battery cost is another vital controlling factor before commercialization, looking for a pack cost of USD 100–125 kWh−1 to compete with conventional combustion energy-driven vehicles.
Wentker et al. introduced a bottom-up approach model to calculate the cost and performance of commercial cathode materials [241]. An estimate of the cost-to-performance ratio (R) to evaluate their economic prospects is provided, as Tyagi et al. suggested [242].
Figure 10a,b show the cost and energy density of different compositions of NMC with calculated R-values for commercialization. The R-value decreases with the reduction in Co content. Figure 10c,d show commercial electric vehicles’ energy density and R-values with organic liquid electrolytes.
8. Summary and Perspectives
LiNixMnyCozO2 (NMC) is the most successful cathode material due to its improved energy density and the smaller amount of cobalt. NMC333, NMC442, and NMC532 are state-of-the-art cathode materials in the LIB market. Ni-rich cathodes such as NMC622 and NMC811 are maturing cathodes for EVs with high specific capacities and lower costs. Ni-rich NMC cathodes face challenges such as cation mixing, detrimental side reactions, and phase transformations, leading to rapid capacity fading and poor battery performance. Strategies and modifications/optimizations on structural stability, binder, electrolyte, and electrolyte additives to extract maximum battery performance without appreciable degradation on cycling are currently aplenty in the literature. In this review, the effects of various binders and electrolytes/additives for NMC cathode-based half/full cells were collated extensively from the literature and critically analyzed.
To extract the best characteristics of the NMC cathodes, a compatible binder and electrolyte system has to be designed by optimizing the electrolyte–additives and binder to enhance the cycling capability without any deterioration in the cathode crystal structure. The synthesis of novel additives with different functional groups (nitrile, amine, fluorocarbon, ether, ester) and interfacial engineering for the electrode–electrolyte interface can improve the structural integrity and stability of the SEI layer. Figure 11a,b show the specific capacity and normalized capacity retention of NMC-based full-cell and half-cell compositions, respectively. The best combinations of electrolyte systems with additives (line marks) and without additives in the best voltage range of performance are graphically summarized [68,127,132,141,148,156,169,170,179]. In full cells with graphite, NMC 111 and NMC 811 have comparable specific capacities, but NMC 811 shows drastic improvement in reversible capacity in an optimized additive/electrolyte combination (Figure 11a).
Single-crystal (SC) NMC cathodes can provide better structural integrity, cycling stability, and thermal safety than polycrystals. SC-NMC consists of micron-sized particles with highly compacted and volumetric energy density. Novel optimized synthetic methods, hetero-atom doping, and surface coating can further improve the SC-NMC cathodes. The impact of non-electrode components on SC-NMC, which was missing until now, is presented in this review. Compared to polycrystals, SC-NMC (optimized for reversible capacity and C-rate capabilities) shows better electrochemical performance with solid-state electrolytes and can be favorable for the future commercial market. The literature is inconsistent about the battery metrics of SC-NMC; the cycling retention improves, but the capacity and rate capability of SC-NMC must be optimized for further commercialization of the cathodes. The improvement in cyclic retention with the right choice of electrolyte–additive combinations is shown in Figure 11. As evident from the figure, the half-cell performance of NMC 811 in the polycrystalline case (~190 mAh g−1) is improved upon in the single-crystalline morphology (~225 mAh g−1) of NMC 811 in an optimized binder–electrolyte–additive combination. Figure 11c shows the best combinations of electrolytes, additives, and binders for single-crystal morphology of NMC [210,213,220,226,236,238].
The electrolyte–additive combinations with the best battery metric for each polycrystalline NMC composition are tabulated in Table 11.
The electrolyte–additive combinations with the best battery metric for each SC-NMC (single crystalline) composition are tabulated in Table 12.
D.D.: Methodology, resources, figures—permission, reproduction, and adaption, and writing—original draft preparation, review, and editing. S.M.: Resources, figures—permission, reproduction, adaption, and editing. S.P.: Conceptualization, supervision, visualization, resources, writing—review and editing, funding acquisition, and project administration. All authors have read and agreed to the published version of the manuscript.
Not applicable.
D.D. thanks CSIR, New Delhi, India, for his fellowship (09/081(1343)/2019-EMR-I). S.M. thanks DST, INSPIRE, India, for her fellowship (IF190531).
The authors declare no conflict of interest.
Footnotes
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Physical properties of carbonate solvents [
Solvent | Dielectric Constant | Viscosity (cP) (25 °C) | Ionic Conductivity |
Melting Point (°C) | Oxidation Potential (V vs. Li/Li+) |
---|---|---|---|---|---|
EC | 89.78@40 °C | 1.93@40 °C | 8.3 | 36.4 | 5.5 |
PC | 64.95 | 2.51 | 5.6 | −54.5 | 5.2 |
DMC | 3.107 | 0.59 | 6.0 | 4.6 | 5.5 |
DEC | 2.820@20 °C | 0.748 | 4.2 | −43 | 5.2 |
EMC | 2.958 | 0.65 | 3.5 | −53 | 6.1 # |
FEC | 110 | 4.1 | 5.0 | 18 | 6.6 |
# glassy carbon is used as a working electrode instead of platinum.
Physical properties of different Lithium salts.
Salt | Mol. Wt. | Melting Point (Tm)(°C) | Tdecomposition (°C) in Solution | Al Collector Corrosion |
---|---|---|---|---|
LiPF6 | 151.9 | 200 | ~80 (EC/DMC) | N |
LiBF4 | 93.9 | 293 | >100 | N |
LiAsF6 | 195.9 | 340 | >100 | N |
LiClO4 | 106.4 | 236 | >100 | N |
LiTFSI | 286.9 | 234 | >100 | Y |
Physical properties of popular NMC binders [
Binders | Structure | Solvent | Properties |
---|---|---|---|
PVDF | [Image omitted. Please see PDF.] | NMP | Linear crystalline thermoplastic fluoropolymer |
CMC | [Image omitted. Please see PDF.] | Water | Linear polymer; environmentally friendly; high viscous; and low ionic impedance |
Na-alginate | [Image omitted. Please see PDF.] | Water | Self-healing effect; uniform distribution of carboxyl group; low ionic impedance |
LA132 | [Image omitted. Please see PDF.] |
Water | Co-polymer of acrylamide, lithium methacrylate, and acrylonitrile; high adhesion property |
PAA | [Image omitted. Please see PDF.] | Water | Linear polymer with uniform distribution of functional group; tuneable mechanical properties |
PDADMA | [Image omitted. Please see PDF.] |
Water | Ionic conductive polymers; wide electrochemical stability window |
Battery metrics for NMC111 full cells with various anodes, electrolytes, and additives.
Electrodes | Electrolytes | Additives | Voltage Range | Sp. Capacity |
Capacity Retention, % |
---|---|---|---|---|---|
NMC111/graphite [ |
1 M LiPF6 in EC: EMC (3:7, w/w) | 3–4.2 V |
140.2 (1 C) |
93% (295, 1 C) |
|
NMC111/graphite [ |
1 M LiPF6 in EC: DEC (1:3, w/w) | 1 wt% LiDFP | 3–4.5 V | 92.6% (100, 1 C) | |
NMC111/graphite [ |
1 M LiPF6 in EC: EMC (3:7, w/w) | 0.1 wt% MUI | 2.8–4.6 V | 197.3 (0.1 C) | 63% (200, 0.3 C) |
NMC111/graphite [ |
1 M LiPF6 in EC: EMC (3:7, w/w) | 2 wt% VC |
2.8–4.2 V | 84% (500, 0.4 C) |
|
NMC111/graphite [ |
1 M LiPF6 in EC: EMC (3:7, w/w) | 2 wt% PES + 1 wt% MMDS + 1 wt% TTSPi | 2.8–4.2 V |
>80% (900, 0.4 C) | |
NMC111/graphite [ |
1 M LiPF6 in EC: EMC (3:7, w/w) | 2 wt% VC + 1 wt% DTD + 0.5 wt% TTSP + 0.5 wt% TTSPi | 2.8–4.2 V |
97% (500, C/2.2) | |
NMC111/graphite [ |
1 M LiTFSI in MCP |
3 wt% FEC | 2.8–4.2 V | 94.4% (195, 1 C) |
|
NMC111/graphite [ |
1 M LiPF6 in EC: DEC (1:3, w/w) | 0.5 wt% EDPN | 3–4.5 V |
156.2 (1 C) | 83.9% (100, 1 C) |
NMC111/graphite [ |
1 M LiPF6 in EC: DMC: EMC (1:1:1, w/w) | 0.2 wt% SDPN | 3–4.6 V | 77.3% (100, 0.2 C) | |
NMC111/graphite [ |
1 M LiPF6 in EC: DMC: EMC (1:1:1, w/w) | 0.1 wt% DMSM | 3–4.6 V | 175.1 (0.2 C) | 80.1% (100, 0.2 C) |
NMC111/graphite [ |
1 M LiPF6 in EC: DMC: EMC (1:1:1, w/w) | 0.2 wt% TFPM |
3–4.6 V | 75.4% (100, 0.2 C) |
|
NMC111/Li [ |
1 M LiPF6 in EC: DEC (1:1, v/v) | 3–4.3 V (55 °C) | 163 (0.1 C) | 92.4% (100, 0.5 C) | |
NMC111/Li [ |
1 M LiPF6 in EC: DMC (3:7, v/v) | 3.5–4.2 V | 150 (0.17 mA/cm2) | ||
NMC111/Li [ |
1.2 M LiPF6 in EC: PC: DMC (1:1:3, w/w) | 2.9–4.6 V | 200 (0.1 mA/cm2) | ||
NMC111/Li [ |
1 M LiPF6 in EC: EMC (3:7, w/w) | 2 vol% VC |
2.5–4.2 V | 121 (0.1 C) |
65% (150, 1 C) |
NMC111/Li [ |
1 M LiPF6 in EC: DMC (1:2, v/v) | 0.5 wt% TMSPI | 3–4.5 V | 91.2% (100, 0.5 C) | |
NMC111/Li [ |
1 M LiPF6 in EC: DMC: EMC (1:1:1 w/w) | 1 wt% LiDFP |
2.8–4.3 V | 67% (400, 1 C) |
|
NMC111/Li [ |
1 M LiPF6 in EC: DEC (1:1 v/v) | 2 wt% LiTDI | 3–4.2 V (55 °C) | 80% (830, 1 C) | |
NMC111/Li [ |
1 M LiPF6 in EC: EMC: DEC (1:1:1, v/v/v) | 0.5 wt% LiBOB |
3–4.6 V | 191 (0.6 C) |
91.8% (60, 0.6 C) |
NMC111/Li [ |
1 M LiPF6 in EC: DEC: DMC (3:5:2, w/w) | 3 wt% TMB | 3–4.5 V | 154 (0.5 C) | 99% (300, 1 C) |
NMC111/Li [ |
1 M LiPF6 in EC: EMC (3:7, w/w) | 1 vol% VC | 3–4.2 V | 137 (0.1 C) | 55% (200, 1 C) |
NMC111/MCMB [ |
1 M LiPF6 in EC: EMC (3:7, w/w) | 1 vol% VC | 3–4.2 V | 132.5 (0.1 C) | 97% (200, 1 C) |
The respective C-rates and specific capacities are in parentheses.
Battery metrics for NMC442 full cells with various anodes, electrolytes, and additives.
Electrodes | Electrolytes | Additives | Voltage Range | Sp. Capacity |
Capacity Retention, % |
---|---|---|---|---|---|
NMC442/graphite [ |
1 M LiPF6 in EC: EMC (3:7, w/w) | 2 wt%PES + 1 wt%MMDS + 1 wt%TTSPi | 3–4.4 V (45 °C) | 85% (500, C/2.5) | |
NMC442/graphite [ |
1 M LiPF6 in EMC:VC (98:2, w/w) | 1% TAP or 1% PPF | 2.8–4.4 (55 °C) | 80% (350, C/2.5) | |
NMC442/graphite [ |
1 M LiPF6 in FEC: TFEC (1:1, w/w) | 1 wt% PES | 2.8–4.5 (40 °C) | ~80% (800, C/2.4) | |
NMC442/graphite [ |
1 M LiPF6 in SL: EMC (3:7, w/w) | 2 wt% VC + 2 wt% TAP | 2.8–4.4 (40 °C) | 80% (500, C/2.4) | |
NMC442/graphite [ |
1 M LiPF6 in EC: DMC: EMC (1:1:1, v/v) | 1 wt% TMSP | 2.75–4.35 V | 164.6(1 C) | 90.8%(70, 1 C) |
The respective C-rates and specific capacities are in parentheses.
Battery metrics for NMC532 full cells with various anodes, electrolytes, and additives.
Electrodes | Electrolytes | Additives | Voltage Range | Sp. Capacity |
Capacity Retention, % |
---|---|---|---|---|---|
NMC532/graphite [ |
1 M LiPF6 in EC: DEC (1:1 v/v) | 1 wt% VC | 2.5–4.2 V (60 °C) | 159 (75 mA gm−1) | 79% (100, 75 mA gm−1) |
NMC532/graphite [ |
1.2 M LiPF6 in EC: EMC (3:7 w/w) | 1 wt% TMSPi |
3–4.4 V | 190 (0.1 C) |
88.8% (119, 0.3 C) |
NMC532/graphite [ |
1 M LiPF6 in EC: DEC (1:3 w/w) | 1 wt% LiDFP | 3–4.5 V | 152.8 (0.1 C) | 93.8% (100, 1 C) |
NMC532/graphite [ |
1 M LiPF6 in EC: EMC (1:2 w/w) | 2 wt% LiDFP | 2.75–4.4 V (25 °C) |
93% (150, 1 C) |
|
NMC532/graphite [ |
1 M LiPF6 in EC: EMC (1:2 w/w) | 1 wt% LiBF4 | 3–4.5 V | 178.1 (1 C) | 90.1% (100, 1 C) |
NMC532/graphite [ |
1 M LiPF6 in EC: EMC: DEC (3:5:2 w/w) | 1 wt% NOB | 2.75–4.5 V (25 °C) | 73% (100, 1 C) | |
NMC532/graphite [ |
1 M LiPF6 in EC: EMC (1:2 w/w) | 0.5 wt% DMS |
2.75–4.2 V (−10 °C) |
98.84% (50, 0.2 C) |
|
NMC532/graphite [ |
1 M LiPF6 in EC: EMC (1:2 w/w) | 0.5 wt% TMSB | 2.5–4.4 V |
181 (0.2 C) |
|
NMC532/graphite [ |
1 M LiPF6 in EC: DEC: EMC (3:2:5, w/w) | 0.25 wt% SDM | 2.75–4.5 V | 96.9% (50, 0.2 C) | |
NMC532/Li [ |
1 M LiPF6 in EC: DMC (1:1 v/v) | 3–4.3 V | 150 (0.4 C) | 95% (50, 0.4 C) | |
NMC532/Li [ |
1 M LiPF6 in EC: DEC (1:1 v/v) | 3–4.4 V | 179.6 (0.2 C) | 94.8% (80, 0.2 C) | |
NMC532/Li [ |
1 M LiPF6 in EC: DEC (1:1 v/v) | 5 vol% FEC | 3–4.3 V | 154 (1 C) | 65% (100, 1 C) |
NMC532/Li [ |
1 M LiPF6 in EC: EMC (3:7 v/v) | 2 wt% DTD | 2.75–4.5 V | 84% (100, 0.5 C) | |
NMC532/Li [ |
1 M LiPF6 in EC: EMC (3:7 v/v) | 2 wt% BDTD | 3–4.6 V | 189 (0.5 C) | 91.6% (100, 0.5 C) |
NMC532/Li [ |
1 M LiPF6 in EC: DMC: DEC (1:1:1 v/v) |
3–4.5 V |
56.3% (100, 0.5 C) |
||
NMC532/Li [ |
1 M LiPF6 in EC: DMC (3:7 v/v) | 0.01 mg ml−1 Li2S + 0.5 vol% AN | 3–4.5 V |
80.74% (200, 1 C) |
The respective C-rates and specific capacities are in parentheses.
Battery metrics for NMC622 full cells with various anodes, electrolytes, and additives.
Electrodes | Electrolytes | Additives | Voltage Range | Sp. Capacity |
Capacity Retention, % |
---|---|---|---|---|---|
NMC622/graphite [ |
1 M LiPF6 in EC: EMC (3:7 w/w) | 3–4.4 V (25 °C) |
174 (1 C) |
84% (308, 1 C) |
|
NMC622/graphite [ |
2.3 mol kg−1 LiTFSI in EC: DME (1:2 v/v) | 2.75–4.2 V | 169.3 (0.5 C) | 98.7% (50, 0.5 C) | |
NMC622/graphite [ |
1 M LiPF6 in EC: EMC (1:2, w/w) | 0.5 wt% PPDI | 3–4.2 V (rt) |
84.9% (600, 1 C) 81.3% (300,1 C) | |
NMC622/graphite [ |
1 M LiPF6 in EC: EMC (1:2, w/w) | 1 wt% CEP | 3–4.5 V | 81.5% (50, 1 C) | |
NMC622/graphite [ |
1 M LiPF6 in EC: EMC (1:2, w/w) | 0.1 wt% HDI | 3–4.2 V | 82.9% (600, 1 C) | |
NMC622/graphite [ |
1 M LiPF6 in EC: EMC (1:2, w/w) | 1 wt% PDTD | 3–4.2 V | 83.7% (500, 1 C) | |
NMC622/Li [ |
1 M LiPF6 in EC: EMC: DMC (1:1:1, v/v) | 0.25 wt% DSON | 3–4.3 V |
84.7% (100, 1 C) |
|
NMC622/graphite [ |
1 M LiPF6 in EC: DEC: EMC (3:2:5, w/w) | 1 wt% pTSF | 3–4.35 V (25 °C) |
88% (600, 1 C) |
|
NMC622/Li [ |
1.2 M LiPF6 in DFEC: EMC (3:7 v/v) | 3–4.4 V | 189.9 (0.1 C) | 83% (400, C/3) | |
NMC622/Li [ |
1.15 M LiPF6 in EC: EMC (3:7, v/v) | 2 wt% VC | 3–4.3 V (60 °C) | 180.9 (C/5) | 91.2% (60, 1 C) |
NMC622/Li [ |
1 M LiPF6 in EC: EMC: DEC (1:1:1, v/v/v) | 10 wt% FEC | 2.8–4.6 V | 196.3 (1 C) | 87.3% (100, 1 C) |
NMC622/Li [ |
1 M LiPF6 in EC: EMC: DEC (1:1:1, w/w/w) | 1 wt% TIB | 3–4.5 V | 183.4 (1 C) | 82.7% (300, 1 C) |
NMC622/Li [ |
1 M LiPF6 in EC: EMC: DMC (1:1:1, v/v/v) | 1 wt% DPDMS | 2.8–4.3 V | 168.2 (1 C, 25 °C) | 93.3% (200, 2 C, 55 °C) |
NMC622/Li [ |
1 M LiPF6 in EC: EMC: DMC (1:1:1, v/v/v) | 0.5 wt% ViD4 |
3–4.5 V | 187.2 (0.2 C) |
83.6% (150, 1 C) |
NMC622/Li [ |
1 M LiPF6 in EC: EMC (3:7, w/w) | 0.5 wt% LiDFOB |
2.8–4.5 V | 91.6% (50, 0.1 C) |
|
NMC622/Li [ |
1 M LiPF6 in PC: EMC: TEP (42.5:42.5:15, v/v) | 2 wt% THFP | 2.8–4.3 V | 160 (100 mA g−1) | 82% (200, 100 mA g−1) |
The respective C-rates and specific capacities are in parentheses.
Battery metrics for NMC811 full cells with various anodes, electrolytes, and additives.
Electrodes | Electrolytes | Additives | Voltage Range | Sp. Capacity |
Capacity Retention, % |
---|---|---|---|---|---|
NMC811/graphite [ |
1 M LiPF6 in EC: EMC (3:7 w/w) | 3–4.0 V |
131.9 (1 C) |
90% (296, 1 C) |
|
NMC811/graphite [ |
1 M LiPF6 in EC: DMC (1:1, v/v) | 1 vol% VC+ 1 vol% TMSPi | 2.75–4.2 V | 91% (200, C/3) | |
NMC811/graphite [ |
1 M LiPF6 in EC: EMC (3:7, w/w) | 0.5 wt% TPPO | 2.8–4.3 V | 198 (0.1 C) | 92% (97, 0.5 C) |
NMC811/graphite [ |
1 M LiPF6 in EC: DMC (3:7, w/w) | 1 wt% PTSS | 3–4.35 V | 117 (0.2 C) | 62.7% (100, 1 C) |
NMC811/graphite [ |
1 M LiPF6 in EMC:EC: DMC (5:3:2, w/w) | 1 w% PFBS | 3–4.2 V (25 °C) |
89.9% (400, 1 C) |
|
NMC811/graphite [ |
1 M LiPF6 in EC: EMC (3:7, v/v) | 0.5 wt%ADN | 2.7–4.3 V | 85.60% (200, 0.3 C) | |
NMC811/graphite [ |
1 M LiPF6 in EC: EMC (1:2, w/w) | 0.25 wt% DES |
2.75–4.3 V |
77.25% (300, 1 C) |
|
NMC811/Li [ |
1.1 M LiPF6 in EC: DEC (1:1, v/v) | 0.1 M LiDFOB + 2 wt% TMSP | 2.7–4.5 V |
74.5% (800, 1 C) |
|
NMC811/Li [ |
1 M LiPF6 in EC: DEC (1:1, v/v) | 0.5 wt% TMSB | 2.7–4.3 V | 165.8 (0.2 C) | |
NMC811/Li [ |
1 M LiPF6 in EC: EMC (1:2, v/v) | 2 wt% TPPa | 3–4.3 V (55 °C) | 210.5 (0.1 C) | 63.5% (100, 1 C) |
NMC811/Li [ |
1 M LiPF6 and 0.1 M LiDFOB in EC: FEC: EMC: DEC (2:1:5:2 w/w) | 1 wt% PVS | 3–4.3 V | 80.8% (400, 0.5 C) |
|
NMC811/Li [ |
1 M LiPF6 in EC: EMC: DEC (5:3:2, w/w/w) | 5 wt% TPBX | 3–4.35 V | 192.1 (1 C) | 78% (100, 1 C) |
NMC811/Li [ |
1 M LiPF6 in FEC: DMC (1:1, v/v) | 3 wt% PFN |
2.7–4.4 V | 92.5% (50, 0.5 C) |
|
NMC811/Li [ |
1 M LiPF6 in EC: DMC: EMC (1:1:1, v/v) | 0.2 wt% TMSTFA | 3–4.3 V | 149 (1 C) | 80% (200, 1 C) |
NMC811/Li [ |
1 M LiFSI in DOL: DME (1:1, w/w) | 1 wt% CPSA | 3–4.3 V | 157.08 (0.5 C) | 82.39% (180, 0.5 C) |
The respective C-rates and specific capacities are in parentheses.
Electrochemical performance of single-crystal NMC in half cells and full cells with various electrolyte–additive compositions.
Electrodes | Electrolytes | Additives | Voltage Range (V) | Temperature (°C) | Sp. Capacity |
Capacity Retention, % |
---|---|---|---|---|---|---|
NMC111/Li [ |
1 M LiPF6 in EC: EMC (3:7 w/w) | 2.8–4.3 V | 163.9 (0.1 C) | ~85% (300, 0.5 C) | ||
NMC111/Li [ |
1 M LiPF6 in EC: DMC (3:7 v/v) | 2.8–4.4 V | 25 | 160 (0.1 C) | ||
NMC111/Li [ |
1 M LiPF6 in EC: DMC (1:1 v/v) | 2.5–4.4 V | 25 |
171 (0.1 C) | 97.2% (100, 0.1 C) |
|
NMC111/Li [ |
1 M LiPF6 in EC: DEC: EMC (1:1:1 v/v) | 2.8–4.4 V | 173.1 (0.1 C) | 88.7% (50, 0.1 C) | ||
LiNi0.5Co0.25Mn0.25O2/Li [ |
1 M LiClO4 in EC: EMC (3:7 w/w) | 1 wt% LiPO2F2 | 3–4.3 V | 25 |
154 (1 C) |
95.3% (200, 1 C) |
NMC532/Li [ |
1 M LiPF6 in EC: DEC (1:1 v/v) | 2.75–4.4 V |
25 |
177.5 (1 C) |
90.6% (100, 1 C) |
|
NMC532/Li [ |
1 M LiPF6 in EC: EMC: DMC (3:2:5 v/v) | 3–4.5 V | 167.3 (1 C) | 90.3% (100, 1 C) | ||
NMC532/graphite [ |
1 M LiPF6 in EMC: DEC: DMC (1:1:1 v/v) | 3–4.2 V | 25 | 141.2 (1 C) | 99% (1000, 1 C) | |
NMC532/graphite [ |
1 M LiPF6 in EC: EMC (3:7 w/w) |
2 wt% PES + 1 wt% TTSPi + 1 wt% DTD |
3–4.4 V | 40 | ~97% (800, C/2) |
|
NMC532/graphite [ |
1 M LiPF6 in EC: EMC (3:7 w/w) | 1 wt% DTD |
3–4.2 V | 40 | 96.8% (400, C/3) |
|
NMC622/Li [ |
1 M LiPF6 in EC: DEC: DMC (1:1:1 v/v) | 2.8–4.3 V | 183.7 (0.2 C) | 89.93% (100,0.2 C) | ||
NMC622/Li [ |
1 M LiPF6 in EC: DEC: DMC (1:1:1 v/v) | 2.8–4.3 V |
25 |
171.3 (0.1 C) |
83.3% (200, 1 C) |
|
NMC622/Li [ |
1 M LiPF6 in EC: DMC: EMC (1:1:1 v/v) | 2.8–4.5 V | 190.4 (0.1 C) | 96.5% (50, 1 C) | ||
NMC622/Li [ |
1 M LiPF6 in EC: DMC (1:1 v/v) | 2.8–4.3 V | 175.5 (0.1 C) | 84.4% (100, 1 C) | ||
NMC622/Li [ |
1 M LiPF6 in EC: DMC (1:1 v/v) | 2.8–4.5 V | 190.1 (1 C) | 96% (50, 1 C) | ||
NMC622/Li [ |
1 M LiPF6 in EC: EMC (3:7 w/w) | 2.8–4.3 V | 176 (0.1 C) | 87.1% (200, 0.5 C) | ||
NMC622/Li [ |
1 M LiPF6 in EC: EMC (3:7 w/w) | 2 wt% VC | 2.8–4.3 V | 30 |
183 (0.1 C) | ~94% (300, 1 C) |
NMC622/Li [ |
1 M LiPF6 in EC: DEC (1:2 v/v) | 2 wt% FEC + 1 wt% DTD | 3–4.4 V | 30 | ~96% (50, C/5) | |
NMC811/Li [ |
1 M LiPF6 in EC: DMC (1:1 v/v) | 2.7–4.3 V | 25 | 206.3 (0.1 C) | 93% (100, 0.1 C) | |
NMC811/Li [ |
1 M LiPF6 in EC: DMC (1:1 v/v) | 3–4.3 V | 203.4 (0.1 C) | 95.5% (300, 1 C) | ||
NMC811/Li [ |
1 M LiPF6 in EC: DMC (1:1 v/v) | 2.8–4.3 V | 226.9 (0.1 C) | 95.1% (100, 1 C) | ||
NMC811/Li [ |
1 M LiPF6 in EC: EMC (3:7 w/w) | 2.8–4.5 V | 199 (C/2) | |||
NMC811/Li [ |
1 M LiPF6 in EC: DEC: FEC (3:6:1 v/v) | 2.5–4.3 V | 30 | 162 (C/20) | 90% (90, C/5) | |
NMC811/Li [ |
1 M LiPF6 in EC: DMC: EMC (1:1:1 v/v) | 2.8–4.5 V | 221.2 (0.1 C) | 91.6% (50, 1 C) | ||
NMC811/Li [ |
1 M LiPF6 in EC: DMC: DEC (1:1:1 v/v) | 3–4.3 V | 206 (0.1 C) | 92% (200, 0.5 C) | ||
NMC811/Li [ |
1 M LiPF6 in EC: DMC: EMC (1:1:1 v/v) | 2.8–4.3 V | 196.7 (0.2 C) | 95.2% (100, 1 C) | ||
NMC811/Li [ |
1 M LiPF6 in EC: DMC: EMC (1:1:1 v/v) | 3–4.4 V | 25 |
216 (0.1 C) |
81.8% (200, 1 C) |
|
NMC811/Li [ |
1 M LiPF6 in EC: DMC: EMC (1:1:1 w/w) | 2.8–4.3 V | 198.9 (0.1 C) | 96.2% (150, 1 C) | ||
NMC811/Li [ |
1.15 M LiPF6 in EC: DMC: EMC (3:3:4 v/v) | 3–4.45 V | 176 (0.1 C) | |||
NMC811/Li [ |
1.5 M LiPF6 in EC: EMC: DMC (25:5:70 v/v) | 2 wt% FEC + 1 wt% LFO | 3–4.2 V | 55 | ~85% (1000, C/3) | |
LiNi0.83Mn0.07Co0.10O2/Li [ |
1 M LiPF6 in EC: DEC (3:7 w/w) | 3–4.5 V |
94.5% (30, 0.5 C) |
|||
LiNi0.83Mn0.05Co0.12O2/Li [ |
1 M LiPF6 in EC: DEC (1:1 v/v) | 2.75–4.3 V | 25 | 209.7 (0.1 C) | 99.56% (100, 0.2 C) | |
LiNi0.83Mn0.05Co0.12O2/Li [ |
1.2 M LiPF6 in EC: EMC (3:7 v/v) | 2 wt% VC | 2.8–4.3 V | 209 (0.1 C) | 96.6% (100, 1 C) |
|
LiNi0.9Co0.055Mn0.045O2/Li [ |
1 M LiPF6 in EC: DMC: EMC (1:1:1 v/v) | 2.8–4.3 V | 27 | 220.6 (0.1 C) | 93% (50, 1 C) | |
LiNi0.91Mn0.03Co0.06O2/Li [ |
1 M LiPF6 in EC: DMC: EMC (1:1:1 v/v) | 3–4.3 V | 203.8 (0.1) | 80.8% (70, 0.5 C) |
The respective C-rates and specific capacities are in parentheses.
Energy output and driving range of commercialized NMC cathode from automobile manufacturers (2013–2021) [
Cell Chemistry (Cathode/ Anode) | Cell Specification | Battery Packs | Electric Vehicle Model | ||||||
---|---|---|---|---|---|---|---|---|---|
Producer | Type | Capacity (Ah) | Voltage(V) | Specific Energy (Wh kg−1) | Energy Density (Wh L−1) | Energy (kWh) | Range (km) | ||
NMC/LTO | Toshiba | Prismatic | 20 | 2.30 | 89 | 200 | 20 | 130 | Honda Fit EV (2013) |
NMC111/C | Li-Tec | Pouch | 52 | 3.65 | 152 | 316 | 17 | 145 | Smart Fortwo EV (2013) |
NMC111/C | Samsung SDI | Prismatic | 60 | 3.7 | 122 | 228 | 22 | 130 | BMW i3 (2014) |
NMC622/C | SK Innovation | Pouch | 38 | 3.70 | 27 | 145 | Kia Soul EV (2014) | ||
NMC/C | Panasonic | Prismatic | 25 | 3.70 | 130 | 215 | 24 | 190 | VW e-Golf (2015) |
NMC/C | LG Chem | Pouch | 56 | 3.65 | 186 | 393 | 60 | 383 | Chevrolet Bolt (2016) |
NMC111/C | Samsung SDI | Prismatic | 94 | 3.7 | 189 | 357 | 33 | 183 | BMW i3 (2017) |
NMC721/C | LG Chem | Pouch | 59 | 3.70 | 241 | 466 | 41 | 400 | Renault Zoe (2017) |
NMC532/C | AESC | Pouch | 56.3 | 3.65 | 130 | 205 | 39 | 240 | Nissan Leaf (2018) |
NMC622/C | Samsung SDI | Prismatic | 120 | 3.7 | 42 | 246 | BMW i3 (2019) | ||
NMC721/C | LG Chem | Pouch | 64.6 | 3.7 | 259 | 648 | 93.4 | 100 | Porsche Taycan (2019) |
NMC532/C | LG Chem | Pouch | 78 | 292 | Volvo XC40 (2019) | ||||
NMC721/C | LG Chem | Pouch | 145 | 1.85 | 164 | 267 | 58 | 350–544 | Volkswagen ID.3 |
NMC622/C | LG Chem | Pouch | 55 | 3.75 | 151 | 228 | 65 | 417 | Chevrolet Bolt (2020) |
NMC622/C (Li-ion Polymer) | SK Innovation | Pouch | 180 | 3.56 | 250 | 64 | 391 | Kia Soul EV (2020) | |
NMC622/C | LG Chem | Laminated | 56.3 | 151 | 62 | 364 | Nissan Leaf E plus (2020) | ||
NMC721/C | LG Chem | Pouch | 64.6 | 3.65 | 263 | 648 | 85 | 392 | Audi e-tron GT (2021) |
NMC721/C | LG Chem | Pouch | 78 | 3.65 | 156 | 77 | 305 | Audi Q4 e-tron-SUV (2021) | |
NMC622/C | LG Chem (Umicore) | Pouch | 60 | 142 | 164 | 64 | 484 | Hyundai KONA Electric (2021) | |
NMC/C (Li-ion Polymer) | LG Chem | Pouch | 77 | 488 | Hyundai ioniq 5-LR AWD (2021) | ||||
NMC811/C (Li-ion Polymer) | SK Innovation | Pouch | 180 | 3.56 | 250 | 64 | 370 | Kia Niro (2021) | |
NMC811/C (Li-ion Polymer) | LG Chem | Pouch | 11.2 | 163 | 230 | 78 | 303 | Kia EV6-LR AWD (2021) |
The electrolyte–additive combinations with the best battery metric for each polycrystalline NMC composition [
Electrodes | Electrolytes | Additives | Voltage Range | Capacity Reported (mAh g−1) | Cycle Stability |
---|---|---|---|---|---|
NMC111/graphite | 1 M LiPF6 in EC: EMC (3:7, w/w) | 0.1 wt% MUI |
2.8–4.6 V | 197.3 (0.1 C) |
63% (200, 0.3 C) |
NMC442/graphite | 1 M LiPF6 in EC: DMC: EMC (1:1:1, v/v) | 1 wt% TMSP |
2.75–4.35 V | 164.6 (1 C) | 90.8% (70, 1 C) |
NMC532/graphite | 1.2 M LiPF6 in EC: EMC (3:7 w/w) | 1 wt% TMSPi |
3–4.4 V | 190 (0.1 C) |
88.8% (119, 0.3 C) |
NMC622/graphite | 1 M LiPF6 in EC: EMC (1:2, w/w) | 1 wt% CEP |
3–4.5 V | 192 |
81.5% (50, 1 C) |
NMC811/graphite | 1 M LiPF6 in EC: EMC (3:7, w/w) | 0.5 wt% TPPO |
2.8–4.3 V | 198 (0.1 C) |
92% (97, 0.5 C) |
NMC111/Li | 1 M LiPF6 in EC: EMC: DEC (1:1:1, v/v/v) | 0.5 wt% LiBOB |
3–4.6 V | 191 (0.6 C) |
91.8% (60, 0.6 C) |
NMC532/Li | 1 M LiPF6 in EC: EMC (3:7 v/v) | 2 wt% BDTD |
3–4.6 V | 189 (0.5 C) |
91.6% (100, 0.5 C) |
NMC622/Li | 1 M LiPF6 in EC: EMC: DEC (1:1:1, v/v/v) | 10 wt% FEC |
2.8–4.6 V | 196.3 (1 C) |
87.3% (100, 1 C) |
NMC811/Li | 1 M LiPF6 in EC: EMC: DEC (5:3:2, w/w/w) | 5 wt% TPBX |
3–4.35 V | 192.1 (1 C) |
78% (100, 1 C) |
The electrolyte–additive combinations with the best battery metric for each SC-NMC (single crystalline) composition [
Electrodes | Electrolytes | Voltage Range (V) | Capacity Reported (mAh g−1) | Cycle Stability |
---|---|---|---|---|
NMC111/Li | 1 M LiPF6 in EC: DMC (1:1 v/v) | 2.5–4.4 V | 171 (0.1 C) | 97.2% (100, 0.1 C) |
NMC532/Li | 1 M LiPF6 in EC: DEC (1:1 v/v) | 2.75–4.4 V | 177.5 (1 C) | 90.6% (100, 1 C) |
NMC622/Li | 1 M LiPF6 in EC: DMC: EMC (1:1:1 v/v) | 2.8–4.5 V | 190.4 (0.1 C) | 96.5% (50, 1 C) |
NMC811/Li | 1 M LiPF6 in EC: DMC (1:1 v/v) | 2.8–4.3 V | 226.9 (0.1 C) | 95.1% (100, 1 C) |
LiNi0.83Mn0.05Co0.12O2/Li | 1 M LiPF6 in EC: DEC (1:1 v/v) | 2.75–4.3 V | 209.7 (0.1 C) | 99.56% (100, 0.2 C) |
LiNi0.9Co0.055Mn0.045O2/Li | 1M LiPF6 in EC: DMC: EMC (1:1:1 v/v) | 2.8–4.3 V | 220.6 (0.1 C) | 93% (50, 1 C) |
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Abstract
Among the current battery technologies, lithium-ion batteries (LIBs) are essential in shaping future energy landscapes in stationary storage and e-mobility. Among all components, choosing active cathode material (CAM) limits a cell’s available energy density (Wh kg−1), and the CAM selection becomes critical. Layered Lithium transition metal oxides, primarily, LiNixMnyCozO2 (NMC) (x + y + z = 1), represent a prominent class of cathode materials for LIBs due to their high energy density and capacity. The battery performance metrics of NMC cathodes vary according to the different ratios of transition metals in the CAM. The non-electrode factors and their effect on the cathode performance of a lithium-ion battery are as significant in a commercial sense. These factors can affect the capacity, cycle lifetime, thermal safety, and rate performance of the NMC battery. Additionally, polycrystalline NMC comprises secondary clusters of primary crystalline particles prone to pulverization along the grain boundaries, which leads to microcrack formation and unwanted side reactions with the electrolyte. Single-crystal NMC (SC-NMC) morphology tackles the cycling stability issue for improved performance but falls short in enhancing capacity and rate capability. The compatibility of different combinations of electrolytes and additives for SC-NMC is discussed, considering the commercial aspects of NMC in electric vehicles. The review has targeted the recent development of non-aqueous electrolyte systems with various additives and aqueous and non-aqueous binders for NMC-based LIBs to stress their importance in the battery chemistry of NMC.
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