Kabushiki Kaisha Toyota Jidoshokki

National Institute of Advanced Industrial Science and Technology

The University of Tokyo

Hitoshi Aikiyo

Tomoyuki Kawai

Yoshihiro Nakagaki

Hiroyuki Sasaki

Tetsuo Sakai

Atsuo Yamada

Yuki Yamada

Yuta Ikeuchi

Toshikatsu Kojima

Akira Kojima

Tatsuya Eguchi

Takeshi Maki

Kohei Mase

Yuki Hasegawa

Toshiya Arakawa

A method for producing a secondary battery including:

Method for producing secondary battery including coating on electrode surface

Electrolytic solution

To provide a lithium ion secondary battery capable of suppressing thermal run-away when internal short circuiting occurs. The lithium ion secondary battery includes: a positive electrode including a current collector, a positive electrode active material layer that is formed on the current collector and that contains a lithium-containing complex oxide having a layered rock salt structure and being represented by general formula: LiNiCoMnDO(0.2&#x2266;a&#x2266;1; b+c+d+e=1; 0&#x2266;e&#x3c;1; D is at least one element selected from Li, Fe, Cr, Cu, Zn, Ca, Mg, S, Si, Na, K, and Al; 1.7&#x2266;f&#x2266;2.1), and a thermal run-away suppressing layer formed on the positive electrode active material layer and containing a lithium transition metal silicate; and a negative electrode including a negative electrode active material. A ratio of the mass of the lithium-containing complex oxide with respect to the mass of the lithium transition metal silicate in the positive electrode is not lower than 1.5.

Lithium ion secondary battery having positive electrode that comprises thermal run-away suppressing layer on positive electrode active material layer

Growing community of inventors

Kariya, Japan

Hitoshi Aikiyo