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Abstract

There is provided a method of producing an active material of a positive electrode used for an alkaline secondary battery which is difficult to be oxidized, and high in its reactivity with an alkaline electrolyte to form a cobalt electric conductive matrix improved in electric conductivity. The method of producing thereof is characterized in that nickel hydroxide powder is dispersed in an aqueous solution of a strongly acidic cobalt salt and the dispersed solution thereof is, while being stirred, added gradually with an aqueous alkali solution to made to react one with another to precipitate a cobalt hydroxide while maintaining the reaction solution in the region of acidity to neutrality, and a solid part in which the cobalt hydroxide is mixed in the nickel hydroxide is separated from the reaction solution which is in the region of acidity to neutrality after the completion of the reaction, and is then washed with water. By this method of producing, there is obtained an active material of a positive electrode used for an alkaline secondary battery in which the amorphous to microcrystal cobalt hydroxide is mixed in the nickel hydroxide. Thus, using this active material of the positive electrode, a paste-type nickel electrode improved in utilization rate is obtained, and using the nickel electrode, an alkaline storage battery which has a high capacity and is excellent in the battery characteristics such as discharging characteristics, etc. is obtained.

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