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Studies on the effect of anions of various lithium salts in PEMA gel polymer electrolytes



Polyvinylidene fluoride (PVdF)–polyethyl methacrylate (PEMA) based electrolytes comprising a binary mixture of solvents (EC and PC) (ethylene carbonate and propylene carbonate) and lithium salts LiX (X = ClO4, BF4, CF3SO3) have been prepared using solvent casting technique. The prepared electrolytes were subjected to ionic conductivity, XRD, SEM, and FTIR analysis to understand the salt contribution. Comparison of conductivity studies of the electrolytes with the three salts has also been made. These electrolytes exhibited good electrochemical properties, because they have an ionic conductivity of the order of 10−3 S cm−1, an electrochemical window exceeding 4.5 V and lithium ion transference number averaging above 0.75. Because, the complex containing LiClO4 exhibited maximum conductivity among the other complexes studied, DMA and CV analyses were also been performed and the results are reported. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011