| 摘要 |
A cadmium negative electrode is prepared having excellent cycle characteristics without impairing the production efficiency even in case the impurities incorporated during filling the active material should be removed by heat treatment. The method includes filling the nickel sintered substrate with an active material based on cadmium hydroxide to obtain an active material filled electrode plate; heating the active material filled electrode plate to change at least a part of the thus filled active material based on cadmium hydroxide into cadmium oxide; adding polyvinyl alcohol into the active material; and hydrating the active material filled electrode plate added with polyvinyl alcohol i.e., immersing the electrode plate in an alkaline solution to convert cadmium oxide into cadmium hydroxide.
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