Structure, thermal and transport properties of PVAc–LiClO 4 solid polymer electrolytes

Abstract

The lithium ion conducting solid polymer electrolytes (SPE) based on PVAc-LiClO 4 of various compositions were prepared by solution casting technique. Structure and surface morphology characterization were studied by X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM) measurements, respectively. Thermal and conductivity behavior of polymer–salt complexes were studied by employing differential scanning calorimetry (DSC) and ac impedance measurements, respectively. XRD and SEM analyses indicate the amorphous nature of the polymer-salt complexes. DSC measurements show decrease in T g with the increase in LiClO 4 concentrations. The bulk conductivity of the PVAc:LiClO 4 polymer electrolytes was found to vary between 7.6×10 −7 and 6.2×10 −5 S cm −1 at 303 K with the increase in salt concentration. The temperature dependence of the polymer electrolyte complexes appear to obey Arrhenius law.