| 摘要 |
PROBLEM TO BE SOLVED: To improve characteristics such as capacity density, a utilization factor and transformation restraint intoγrays. SOLUTION: In a positive electrode mainly composed of nickel hydroxide active material particles, its positive electrode is composed of at least two kinds of active material particles 1 and 2 different in the composition, and is also composed of at least two kinds of nickel hydoxide active material particles which contain the same additional element and whose inclusion ratios are different from each other or at least two kinds of nickel hydoxide active material particles different in a kind of additional element.
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