Conductivity and Electrochemical Studies on Polymer Electrolytes Based on Poly Vinyl (chloride) - Ammonium Triflate-Ionic Liquid for Proton Battery

Solid polymer electrolyte films of poly (vinyl) chloride (PVC) with ammonium trifluoromethane sulfonate (NH4CF3SO3) and ionic liquid, butyltrimethyl ammonium bis (trifluoromethyl sulfonyl) imide (BATS) as plasticizer have been prepared by solution-cast technique. The films were characterized electrically by Impedance Spectroscopy for its ionic conductivity. The highest ionic conductivity achieved at room temperature was for 85 wt. % (PVC -NH4CF3SO3) + 15 wt. % BATS with ionic conductivity of 1.56 x 10(-4) Scm(-1). Ionic transference number of the mobile ions estimated by dc polarization method and the H+ ionic transference number was found to be similar to 0.82 which revealed that the conducting species are predominantly ions. Linear sweep voltammetry results revealed that the film is electrochemically stable up to 1.1 V. An electrochemical cell fabricated using configuration of: Zn+ZnSO4.7H(2)O + PTFE (anode) | 85 wt. % (PVC -NH4CF3SO3) + 15 wt. % BATS | MnO2+ PTFE (cathode) produced a maximum open circuit voltage of similar to 1.52 V while its discharge characteristics demonstrated a capacity of 6.0 mAh using 1.5 k Omega load resistance.