Electrochemical studies on [(1 − x)PVA– xPMMA] solid polymer blend electrolytes complexed with LiBF 4

Abstract

PVA–PMMA-based electrolyte films containing fixed LiBF 4 salt are prepared using solvent casting technique. The complexation has been confirmed from XRD and FTIR spectral studies. The ac impedance studies are performed to evaluate the ionic conductivity of the polymer electrolyte membranes in the range 302–373 K and the temperature dependence seems to obey the VTF relation. The influence of blend compositions on the ionic conductivity has been discussed. The maximum ionic conductivity value for PVA (60 wt.%)–PMMA (40 wt.%)–LiBF 4 (10 wt.%) system is found to be 2.801 × 10 −5 S cm −1 at 302 K. Thermal analysis and CV studies have been performed and reported here.