Panasonic Corporation

Katsuya Sawada

Fumio Kato

Shigeto Noya

Yasuo Mukai

Hidekatsu Izumi

Tadaya Okada

There is disclosed an alkaline battery including a positive electrode material mixture, a negative electrode, a separator interposed between the positive electrode material mixture and the negative electrode, and an alkaline electrolyte, wherein the positive electrode material mixture includes a first active material comprising nickel oxyhydroxide and a second active material comprising manganese dioxide, the nickel oxyhydroxide includes a &#x3b3;-type crystal structure, the content of nickel in the nickel oxyhydroxide is not less than 45 wt %, and the average particle diameter on a volume basis of the nickel oxyhydroxide measured with a laser diffraction particle size distribution analyzer is 3 to 20 &#x3bc;m.

Alkaline battery and positive electrode material for alkaline battery comprising nickel oxyhydroxide and manganese dioxide

An alkaline battery of the present invention includes a positive electrode material mixture including nickel oxyhydroxide. The nickel oxyhydroxide includes a secondary particle with a crystal structure mainly composed of &#x3b3;-type at least a portion of the surface layer of the secondary particle, and with a crystal structure mainly composed of &#x3b2;-type in the inner portion of the secondary particle. Based on the present invention, the advantage of the alkaline battery, i.e., excellence in discharge performance under high-load, can be kept and the conventional problem of storage characteristics can be improved.

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Hirakata, Japan

Katsuya Sawada