BINDER FOR LITHIUM ION SECONDARY BATTERY ELECTRODES, SLURRY OBTAINED BY USING THE BINDER FOR ELECTRODES, ELECTRODES OBTAINED BY USING THE SLURRY, AND LITHIUM ION SECONDARY BATTERY OBTAINED BY USING THE ELECTRODES

摘要

PROBLEM TO BE SOLVED: To provide a binder for lithium ion secondary battery electrodes, a slurry using the binder, electrodes using the slurry, and a lithium ion secondary battery using the electrodes, in which binding properties between active materials themselves and between the active material and a current collector in a water dispersion system are good and high temperature cycle properties in charging and discharging are also good.SOLUTION: A binder composition for lithium ion secondary battery electrodes has a glass transition temperature of 30°C or less for resultant of emulsion polymerization of ethylenic unsaturated monomers containing: styrene in 15-70 wt.% to the total ethylenic unsaturated monomers; ethylenic unsaturated carboxylate ester; ethylenic unsaturated carboxylic acid; and an internal cross linking agent, as essential components in the presence of surfactant.