BINDER FOR RECHARGEABLE BATTERY WITH NONAQUEOUS ELECTROLYTE AND BATTERY ELECTRODE DEPOLARIZING MIX PREPARED USING THE SAME

摘要

To provide a binder for secondary battery using non-aqueous electrolyte which is soluble in usual organic solvents, does not swell in a non-aqueous electrolyte and besides enhances battery performance. As the binder, a copolymer comprising 50 to 80 % by mole of vinylidene fluoride, 17 to 50 % by mole of tetrafluoroethylene and less than 3 % by mole of a monomer copolymerizable therewith is used.