Toshiba Battery Co., Ltd.

Masayoshi Hiruma

Kunihiko Miyamoto

Naomi Bando

Makoto Wakabayashi

Ken-ichi Kanno

Hiroshi Kaneko

Takeshi Fukuju

Ken Komiyama

Tetsuya Yamane

Manabu Takezawa

Provided is a current collector substrate in an electrode of an alkaline secondary battery, which is advantageous not only in that it has excellent holding ability for a mixture for electrode, but also in that the utilization of an active material is improved, thereby enhancing the discharge characteristics of the battery, and an electrode and an alkaline secondary battery using the same. This current collector substrate has a plurality of openings formed within the surface of a metal powder sinter sheet which has a thickness (t) of 80 &mgr;m or less and is produced by a powdery calendering process, wherein the openings have periphery portions comprising burr portions protruding in the opposite directions.

Current collector substrate in electrode for use in alkaline secondary battery, electrode using the same, and alkaline secondary battery having incorporated thereinto the electrode

The present invention is to provide a production method of an active material for an alkaline secondary battery comprising: a step of mixing particles comprising particles mainly containing nickel hydroxide and particles of a metal cobalt or a cobalt compound in a mixer with a sealed structure comprising a heating means in the presence of oxygen and an alkaline aqueous solution while heating. An active material produced by the method allows a high utilization. And a battery assembled with a positive electrode using the active material has an excellent high ratio discharge characteristic, and hardly causes the capacity decline even at the time of recharging after leaving in the over discharge state for a long time.

Production method of active material for positive electrode of alkaline secondary battery, positive electrode using the active material and production method of alkaline secondary battery using the positive electrode

An alkaline secondary battery comprising a positive electrode, a negative electrode, and an alkaline electrolyte, wherein the positive electrode comprises a conductive substrate and a mixture held by the conductive substrate, the mixture containing nickel hydroxide and a conductive cobalt compound, and the positive electrode has pores, substantially all of the pores each having a diameter with a range of 0.0001 .mu.m to 10 .mu.m.

Alkaline secondary battery, paste type positive electrode for alkaline

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Yokohama, Japan

Masayoshi Hiruma