| 摘要 |
An alkaline storage battery includes a positive electrode ( 1 ) a negative electrode ( 2 ), and an alkaline electrolyte solution. The negative electrode uses a hydrogen-absorbing alloy powder containing at least a rare-earth element, Mg, Ni, and Al, and has an intensity ratio I<SUB>A</SUB>/I<SUB>B </SUB>of 0.1 or greater in X-ray diffraction analysis using Cu-Kalpha radiation, where I<SUB>A </SUB>is the strongest peak intensity that appears in the range of 2theta=31 to 33°, and I<SUB>B </SUB>is the strongest peak intensity that appears in the range of 2theta=40 to 44°. When the alkaline storage battery is activated, the condition M1/M2<=0.18 is satisfied, where M1 is a Mg concentration in a region of particles of the hydrogen-absorbing alloy powder within 30 nm from the surface thereof and M2 is a Mg concentration in an inner region of the hydrogen-absorbing alloy particles in which the oxygen concentration is less than 10 weight %.
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