| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrolyte in a solid state which superior in electrolyte holding property at a high temperature, in which a high ion conductivity and a superior dynamic strength are well-balanced by using a polyvinylidene fluoride compound, having a side chain introduced thereto by electron beam emission for the matrix polymer of a gel polymer electrolyte. SOLUTION: Polyvinylidene fluoride powder is made coexistent with an acrylate compound, and a side chain is introduced thereto by irrading with electron beam. The thus-introduced side chain of the polyvinylidene fluoride compound is introduced in a ratio of 3-40% to the repeating unit of vinylidene fluoride, and an electrolyte consisting of an ionic compound dissolved in a nonaqueous organic solvent is preferably controlled within a range of 30-85 wt.%. Thus, dynamic strength and electrolyte holding property up to a high temperature of about 100 deg.C can be ensured, while enabling keeping high ion conductivity, eliminating the concern of fare of leakage from with the use of the electrolyte in a solid state, and a secondary battery can be made extremely small in thickness. |
