POLYMER MATERIAL FOR NON-AQUEOUS SECONDARY CELL AND PROCESS FOR PRODUCING THE SAME

摘要

PURPOSE: Provided is a polymer material for a non-aqueous secondary cell, which is excellent in compatibility with organic solvents, impregnation property into organic electrolyte, ionic conductivity, and mechanical property. CONSTITUTION: The polymer material is produced by a process comprising the steps of: neutralizing methyl methacrylate-methacrylic acid copolymers having a repeat unit represented by the formula 2 with alkali metal hydroxide water solution to obtain methyl methacrylate-alkali metal methacrylate copolymer ionomers having a repeat unit represented by the formula 1; dissolving the copolymer ionomers and a vinylidene fluoride polymer in the weight ratio of 1:99-99:1 in a cosolvent and adding an organic solvent as a plasticizer to obtain a homogeneous solution; casting the homogeneous solution and volatilizing the cosolvent to obtain a polymer film; extracting the plasticizer by impregnating the polymer film with a low alcohol to obtain a porous polymer film. In the formula, x is 0.01-0.99 and M is Li, Na, or K.