Preparation and characterization of Lithium ion conducting blend polymer (PVA-PVP) with LiBr

Lithium ion conducting blend polymer electrolytes based on Poly(vinyl alcohol) (PVA) and Poly(vinyl pyrrolidone) (PVP) doped with different concentrations of lithium bromide (LiBr) have been prepared by solution casting method. The prepared electrolytes have been characterized by XRD, FTIR, DSC and AC impedance techniques. The complex formation between the blend polymer, PVA-PVP and the salt, LiBr has been confirmed by XRD and FTIR analyses. It has been observed that the ionic conductivity of the doped blend polymer electrolyte increases as the salt concentration increases. The maximum ionic conductivity has been found to be 1.03×10 -4 S cm-1 for 70 PVA : 30 PVP : 0.25 M wt % LiBr sample at room temperature.Thermal behavior of the samples has been analyzed by differential scanning calorimetry and thermo gravimetry techniques.