Conductivity and FTIR studies on PEO–LiX [X: CF3SO3−, SO42−] polymer electrolytes

Polymer electrolytes based on poly(ethylene oxide)–lithium triflate (PEO–LiCF3SO3) and poly(ethylene oxide)–lithium sulphate (PEO–Li2SO4) were prepared by using solution casting method. Measurements of conductivity and dielectric were carried out on these films as a function of frequency at various temperatures. It was observed that PEO–LiCF3SO3 polymer electrolytes have higher conductivity. The interaction between PEO and Li salts were studied by Fourier transform infrared (FTIR).