Toyota Jidosha Kabushiki Kaisha

Tanaka Chemical Corporation

Tanaka Limited

Taiki Yasuda

Mikio Hata

Shigeki Sato

Makio Kon

A positive electrode active material for an alkaline storage battery having excellent over-discharge tolerance and high-temperature tolerance, and a method for producing the positive electrode active material. A positive electrode active material for an alkaline storage battery, containing a hydroxide particle containing at least nickel and solid-solubilized cobalt, and a covering layer containing cobalt, the covering layer covering the hydroxide particle, in which cobalt contained in the covering layer and cobalt contained in the hydroxide particle each have a diffraction peak between diffraction angles of 65&#xb0; and 66&#xb0;, the diffraction angles each represented by 2&#x3b8; in a diffraction pattern obtained by X-ray diffraction measurement.

Positive electrode active material for alkaline storage battery, and method for producing positive electrode active material for alkaline storage battery

An objective of the present invention is to provide a positive electrode active material that can inhibit the capacity changes associated with temperature variations, and an alkaline battery that contains this positive electrode active material. Aluminum and ytterbium are at least partially solid-dissolved in nickel hydroxide in the nickel composite hydroxide present in the positive electrode active material of the present invention.

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Fukui, Japan

Taiki Yasuda