| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrolyte which has ion conductivity not less than a specific value and is excellent in dynamic strength by forming a cross-linked structure by electron beam irradiation on a porous polymer thin film composed of a compound containing a vinylidene fluoride polymer and an ethylenic unsaturated bond or a compound containing an epoxy radical, and impregnating an electrolyte by dissolving an ionic compound in a nonaqueous organic solvent. SOLUTION: A polymer in which a porous thin film impregnated with an electrolyte is homogenized and which is a solid electrolyte having ion conductivity not less than 1.0 mS/cm, is desirable to be a copolymer of vinylidene fluoride and tetrafluoroethylene. Methyl acrylate and 1,4-butane diol diacrylate are exemplified as a compound containing an ethylenic unsaturated bond, and ethylene oxide and ethylene glycol glycidyl ether are exemplified as a compound containing an epoxy radical. The electrolyte in which an ionic compound is composed of LiClO4 and a nonaqueous organic solvent is composed of ethylene carbonate, is desirable to be 30 to 85 wt.%. |
