Ionic transport studies in PVDF-HFP-PMMA-(PC+DEC)-LiClO4 gel polymer electrolyte

Poly(vinylidene fluoride-hexafluropropylene)(PVdF-HFP) and Polymethylmethacrylate(PMMA) based gel polymer electrolytes comprising Propylene Carbonate and Diethyl Carbonate mixed plasticizers and different concentrations of Lithium Perchlorate (LiClO4) salt have been prepared using a solvent casting technique. Electrical conductivity and transference number measurements have been carried out by Electrochemical Impedance Spectroscopy in the temperature range 303 K to 363 K and Wagner’s Polarization method respectively. The maximum room temperature conductivity of 2.83 ×10−4 S cm−1 has been observed for the gel polymer electrolytes at 7.5 wt% LiClO4. The variation of ac conductivity with frequency has been discussed.