Studies on PVA: PVP Blend Based Polymer Gel Electrolytes for Battery Applications

摘要

In the present study an attempt has been made to cast a stable free standing PVA: PVP blend based polymer gel electrolyte film using ammonium acetate salt (CH3COONH4) and characterize them for application in solid state batteries. Optical and SEM studies show improvement in amorphous nature of the present system. Formation of blend as well as composite polymer electrolyte is confirmed by DSC and XRD studies. Ionic conductivity of PVA: PVP blend based polymer gel electrolyte, namely, PVA: PVP: CH3COONH4 is seen to improve by an order of magnitude at room temperature with an optimum 1.34×10~(-3) S/cm for 0.4 mole ammonium acetate concentration. I-t measurement (t_(ion)~0.9) establish dominance of ionic charge transport in synthesized electrolytes. Combination of Arrhenius and VTF behavior is reflected during temperature dependent conductivity analysis. Jonscher Power law seems to be obeyed according to ac conductivity measurement. All-solid-state battery has been fabricated in the cell configuration Zn+ZnSO_4 (anode)/polymer Gel Electrolyte/V_2O_5+C+Polymer Gel Electrolyte (cathode) to establish its practical utility in electrochemical devices. Cell performance studies on cell with 0.4 M electrolyte show open circuit voltage of 1.5 volt with power density 1.12 W/Kg been studied by recording the cell potential discharge profiles at room temperature under different load conditions.