| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery stable with good storing property of electrolyte, is highly ion conductive and superior in charging and discharging cycle durability by using a polymer electrolyte which has a copolymer including a polymer unit, based on fluoroolefin and a polymer unit based on hexafluoroacetone as a matrix and contains a solution of a lithium salt. SOLUTION: The weight ratio of a polymer unit, based on fluoroolefin to the polymer unit based on fluoroacetone in a copolymer, is preferably 60/40-97/3. As the polymer unit based on fluoroolefin, vinylidene fluoride is preferred from the point of copolymerizability and the higher strength of the copolymer. As the solvent of a lithium salt solution, carbonate is preferably used, including propylene carbonate. Furthermore the content of the lithium salt solution in the polymer electrolyte is preferably set to 30-90 wt.%. |
