Patent ID: 8043386

Claim:
A process for producing a polymer electrolyte for a nonaqueous battery, comprising: mixing a vinylidene fluoride copolymer and a nonaqueous electrolytic solution with a solvent that can be evaporated, wherein the vinylidene fluoride copolymer comprises 80 to 97 wt. % of vinylidene fluoride monomer units and 3 to 20 wt % of units of at least one monomer copolymerizable with vinylidene fluoride monomer and has an inherent viscosity of 1.7 to 7 dl/g as measured at 30° C. in a solution at a concentration of 4 g of polymer in 1 liter of N,N-dimethylformamide, and evaporating the solvent to form a polymer electrolyte comprising the vinylidene fluoride copolymer impregnated with 75-85 wt. % of the nonaqueous electrolytic solution.