Polymer Electrolyte Films for Solid State Polymer Batteries

Solid polymer electrolyte system films based on polyvinyl alcohol (PVA) complexed with sodium salt was prepared using solution cast technique. The effect of plasticizer (DMF) on the properties of Sodium ion conducting electrolyte was studied. DC conductivity of the films was measured in the temperature range 303–398 K. The electrical conductivity significantly increased with addition of plasticizer, which is attributed to the formation of charge transfer complexes. The polymer complexes exhibited Arrhenius type dependence of conductivity with temperature.. The total ionic transport number was evaluated by means of Wagner's polarization technique .Transport number for Sodium ion is ranged from 0.91 to 0.96 depending on the composition. Electrochemical cells of configuration Na / polymer electrolyte / (I2+C+electrolyte) were fabricated. The open circuit voltage, short circuit current and discharge time for plateau region were measured.