Preparation and characterization of materials for lithium polymer batteries

Abstract

Solid polymer electrolyte films containing chitosan-poly(vinyl alcohol) (PV A)LiCF3S03 were prepared by solution casting technique. Chitosan/PVA (50:50 w/w) solution was diluted in 100 ml 1 % acetic acid solution and stirred using magnetic stirrer overnight at room temperature. Various amount of lithium triflate were added accordingly varies from 5 to 50 wt.%. Complexation of the prepared electrolytes is studied by using EIS and FTIR analysis. The structure of chitosan, PV A and lithium triflate and the miscibility of the blend films were investigated and proved from infrared spectroscopy. Ionic conductivities of the electrolyte have been determined by AC impedance studies in the temperature range of 300-393 K. Results show that the regressions values are obey the Arrhenius plot. Dielectric relaxation studies of the polymer electrolyte have been undertaken and the results were discussed. The highest ionic conductivity value (2.71027 x 10·5 Siem) has been observed for chitosan (0.275g)-PVA (0.275g)-LiCF3S03 (45 wt.%) system with the activation energy, Ea observed is 0.25 e V.