POLYMER ELECTROLYTIC FILM AND FUEL BATTERY USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a novel electrolytic film having a small dimensional change to a state change between a dry state and a swelling state, and high heat resistance.SOLUTION: A polymer electrolytic film herein disclosed comprises: a porous multilayer film 20; and a polymer electrolyte filling the multilayer film 20. The polymer electrolyte includes at least one acidic group selected from a group consisting of -SONHSO-, -SONHCO-, and -CONHCO-. The multilayer film 20 includes a first porous film 11, and a second porous film 12, and a porous adhesion layer 13 disposed between the first film 11 and the second film 12. The films 11 and 12 have different elongation percentages according to directions respectively. The films 11 and 12 are laminated so that an angle formed by the direction which minimizes the elongation percentage of the film 11 and the direction which minimizes the elongation percentage of the film 12 falls within a range of 45° to 90°.