Toyota Jidosha Kabushiki Kaisha

Kabushiki Kaisha Toyota Chuo Kenkyusho

Takahito Imamine

Hiroshi Sawada

Akira Tsujiko

Chikaaki Okuda

Tomitaro Hara

Sachie Yuasa

Mamoru Mizutani

Osamu Hiruta

Yuichi Itou

Tsuyoshi Sasaki

Yuichi Ito

Youji Takeuchi

A lithium-ion secondary battery with excellent durability is provided using a two-phase coexisting compound as a positive electrode active material. This lithium-ion secondary battery is provided with an electrode body having a positive electrode containing a positive electrode active material and a negative electrode containing a negative electrode active material, and a non-aqueous electrolyte solution containing a lithium salt in an organic solvent. The positive electrode active material is mainly composed of a two-phase coexisting compound containing lithium, and also contains particles of a lithium-transition metal oxide with a layered structure. The particles of the layered oxide have an average particle diameter of 2 &#x3bc;m or less, and the percentage content thereof in the positive electrode active material is 5 mass % or less.

Non-aqueous electrolyte solution type lithium ion secondary battery

A lithium ion secondary battery provided by the present invention has a positive electrode having a current collector and a positive electrode composite layer provided on the current collector. The current collector contains a metal element A as a main component thereof. The positive electrode composite layer contains a two-phase compound containing lithium as a positive electrode active material. The positive electrode composite layer also contains as an additive a compound having a metal element B, in a composition thereof, that has a higher ionization tendency than the metal element A.

Non-aqueous electrolyte lithium ion secondary battery

Growing community of inventors

Nisshin, Japan

Takahito Imamine