Patent ID: 7850873

Claim:
A method of preparing a polymer electrolyte, comprising: dissolving sulfonated polyether ketone ketone represented by Formula (1) in a solvent to obtain a sulfonated polyether ketone ketone solution, where n is a number from 100-1,000; adding a cross-linking agent to the sulfonated polyether ketone ketone solution; adding a polymerization initiator to the sulfonated polyether ketone ketone solution; stirring the resulting mixture; and curing the resulting mixture, wherein the cross-linking agent comprises at least one material selected from the group consisting of polyethyleneglycol diacrylate, polyethyleneglycol dimethacrylate, polyethyleneglycol dimethyl ether, and polyethyleneglycol methacrylate, and wherein the amount of the cross-linking agent is about 80 to about 250 parts by weight based on 100 parts by weight of the sulfonated polyether ketone ketone.