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J Mater Sci: Mater Electron (2016) 27:1141011424 DOI 10.1007/s10854-016-5267-x
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Web End = Impedance spectroscopy, ionic conductivity and dielectric studies of new Li+ ion conducting polymer blend electrolytes basedon biodegradable polymers for solid state battery applications
Kalim Deshmukh1 M. Basheer Ahamed1 Anji Reddy Polu2
Kishor Kumar Sadasivuni3 S. K. Khadheer Pasha4 Deepalekshmi Ponnamma5
Mariam Al-Ali AlMaadeed5 Rajendra R. Deshmukh6 K. Chidambaram4
Received: 3 May 2016 / Accepted: 28 June 2016 / Published online: 4 July 2016 Springer Science+Business Media New York 2016
Abstract New solid polymer blend electrolyte lms based on biodegradable polymer blend comprising of polyvinyl alcohol (PVA) and poly (N-vinyl pyrrolidone) (PVP) doped with different wt% of lithium carbonate (Li2CO3) salt have been prepared by solution casting method. The resulting
PVA/PVP/Li2CO3 polymer blend electrolyte lms have been characterized by various analytical techniques such as FTIR, UVvis, XRD, TGA, polarized optical microscopy and scanning electron microscopy. The FTIR and XRD analysis conrmed the complex formation between PVA/ PVP blend and Li2CO3 salt. The ionic conductivity and the dielectric properties of PVA/PVP/Li2CO3 polymer blend electrolyte lms were investigated using an impedance spectroscopy. It was observed that the ionic conductivity of PVA/PVP/Li2CO3 electrolyte system increases as a function of Li2CO3 concentration. The highest ionic conductivity was found to be 1.15 9 10-5 S cm-1 for polymer blend electrolyte with 20 wt% Li2CO3 content. On the
other hand, the dielectric results revealed the non-Debye type of behaviour. The dielectric constant values indicate a strong dielectric dispersion in the studied frequency range which increases as the Li2CO3 content increases. The dielectric constant as high as 1200 (e = 1201.57, 50 Hz, 150 C) and the dielectric loss well below 4 (tan d = 3.94,50 Hz, 150 C) were obtained for polymer blend electrolytes with 25 wt% Li2CO3 salt. Thus, the results obtained in the present study suggest that the PVA/PVP/
Li2CO3 polymer blend electrolyte system seems to be a promising candidate for solid state battery applications.
1 Introduction
Solid polymer electrolytes have received scientic and technological importance in the last few decades because of their potential applications in various elds such as electrochromic displays, fuel cells, solar cells, sensors, supercapacitors and most importantly rechargeable solid state lithium batteries [14]. Lithium batteries have attracted a...