National Institute of Advanced Industrial Science and Technology

Gs Yuasa International Ltd.

Aki Nakashima

Tetsuo Sakai

Tadashi Kakeya

Masanori Morishita

Seijiro Ochiai

Yoshiteru Kawabe

A compound having a high reduction resistance and being capable of sufficiently performing a function as an electronic conductive additive when added to a positive electrode active material as an electronic conductive additive is provided. In a method for producing a cobalt cerium compound including a step of depositing a hydroxide containing cobalt and cerium in an aqueous solution containing cobalt ions and cerium ions by changing the pH of the aqueous solution and thereafter performing a treatment of oxidizing the hydroxide, the ratio of the cerium ions contained in the aqueous solution containing the cobalt ions and the cerium ions is set to be more than 5% by atom and 70% by atom or less with respect to the sum of the cobalt ions and the cerium ions before the hydroxide is deposited.

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Kyoto, Japan

Aki Nakashima