National Institute of Advanced Industrial Science and Technology

Sumitomo Seika Chemicals Co., Ltd.

Masako Kinno

Takashi Mukai

Yuta Ikeuchi

Masahiro Yanagida

Taichi Sakamoto

Junichi Fujishige

Shun Hashimoto

Erina Takahashi

Naoka Hirabayashi

A lithium ion secondary battery includes a positive electrode having a positive electrode active material layer on a current collector, a negative electrode having a negative electrode active material layer on a current collector, and a separator disposed between the positive electrode and the negative electrode and impregnated with a non-aqueous electrolyte solution. The positive electrode active material layer contains a positive electrode active material and a binder, the negative electrode active material layer contains a negative electrode active material and a binder, the binder of the negative electrode active material layer contains a copolymer of vinyl alcohol and an alkali metal neutralized product of ethylenically unsaturated carboxylic acid, and the separator includes a polymeric base material containing an inorganic compound or includes a polymer having a melting point or glass transition temperature of 140&#xb0; C. or higher.

Lithium ion secondary battery and electric device using same

Growing community of inventors

Kako-gun, Japan

Masako Kinno