| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of positive electrode active material for an alkaline battery by which self-discharging can be suppressed. SOLUTION: In a formation process, alkaline metal hydroxide is added to a reaction system containing nickel ions and cobalt (II) ions so as to form nickel hydroxide and cobalt hydroxide. In the case of the formation process or before it, at least one means for removing an oxidizing agent which oxidizes the cobalt(II) ions into cobalt(III) ions is provided. As the means for removing the oxidizing agent, for instance, a reducing agent such as L-ascorbic acid and the like is added to the reaction system so that the oxidizing agent is reduced and is removed. It is desirable that the oxidizing potential of the reducing agent is more basic than the reducing potential of oxygen. In the case of the formation process or before it, it is desirable that a means for removing the cobalt(III) ions is provided. |
