Yuasa Corporation

Mitsuhiro Kodama

Masaharu Watada

Seijiro Ochiai

Minoru Kuzuhara

Masaki Miyamoto

Masahiko Oshitani

Toshiki Tanaka

Yoshihiro Katayama

Kengo Furukawa

Kouichi Sakamoto

Manabu Kanemoto

Kaori Syodai

For accomplishing the subjects, the invention provides a nickel electrode material for use in a nickel electrode, wherein the positive-electrode material constituting the electrode material comprises: positive active material particles which comprise as the main component either a nickel hydroxide or a solid solution in a nickel hydroxide of one or more other elements and in which part of the nickel hydroxide has been oxidized; and a coating layer formed on the surface of the positive active material particles and comprising as the main component a high-order cobalt compound in which the cobalt has an oxidation number larger than 2, the average oxidation number of the nickel in the positive active material particles and the cobalt in the coating layer being from 2.04 to 2.40, and the positive-electrode material having a tap density of 2.0 g/cmor higher. The invention further provides a process for producing the electrode material, a nickel electrode employing the electrode material, and an alkaline storage battery having the nickel electrode.

Nickel electrode material, and production method therefor, and nickel electrode and alkaline battery

A sealed alkaline storage battery including a nickel electrode as a positive electrode, characterized by having the function of being capable of charge when the gas pressure in the battery and/or the battery temperature is not higher than a specified value and of being incapable of charge when the gas pressure in the battery and/or the battery temperature exceeds the specified value.

Sealed alkaline storage battery, electrode structure and charging method for the same, and charger for sealed alkaline storage battery

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Osaka, Japan

Mitsuhiro Kodama