Toyota Jidosha Kabushiki Kaisha

Denso Corporation

Sumitomo Metal Mining Company, Ltd.

Syuuhei Oda

Manabu Yamada

Tomoyoshi Ueki

Satoru Suzuki

Ryuichi Kuzuo

To provide a positive electrode active material for a non-aqueous electrolyte secondary battery, which if used as a positive electrode for a lithium ion secondary battery, the battery internal resistance can be reduced, giving a secondary battery superior in output characteristics and life property. After mixing raw material powders in specified quantities of each so as to become a lithium-metal complex oxide represented by LiNiMO(wherein M is at least one kind or more of metal elements selected from the group consisting of Co, Al, Mg, Mn, Ti, Fe, Cu, Zn, and Ga; and w and z respectively satisfy 0&#x3c;w&#x2266;0.25, and 1.0&#x2266;z&#x2266;1.1), baking is performed in two stages. At first the temperature is raised from room temperature to a first stage baking temperature (450 to 550&#xb0; C.) at a temperature rise rate of 0.5 and 15&#xb0; C./min, and held for 1 to 10 hours. Then the temperature is raised to a second stage baking temperature (650 to 800&#xb0; C.), and held for 0.6 to 30 hours.

Positive electrode active material for non-aqueous electrolyte secondary battery and manufacturing method thereof, and non-aqueous electrolyte secondary battery using same

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Ehime-ken, Japan

Syuuhei Oda