HYDROGEN STORAGE ALLOY FOR ALKALINE STORAGE BATTERY AND ALKALINE STORAGE BATTERY

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PROBLEM TO BE SOLVED : To suppress the deterioration of a hydrogen storage alloy and obtain a sufficient cycle life in an alkaline storage battery using the alloy containing a rare-earth element, Mg, Ni and Al, with an intensity ratio IA/IB of the strongest peak intensity IA appearing within a range of 2[!theta!]=31° to 33° to the strongest peak intensity IB appearing within a range of 2[!theta!]=40° to 44° in an X-ray diffraction measurement using a Cu-Kα ray. SOLUTION : For a negative electrode of the alkaline storage battery, the alloy is used, wherein a layer of an oxide or a hydroxide is formed on the surfaces of hydrogen storage alloy powder containing at least the rare-earth element, Mg, Ni and Al and the intensity ratio IA/IB between the strongest peak intensity IA appearing within the range of 2[!theta!]=31°to 33° and that IB appearing within the range of 2[!theta!]=40° to 44° in the X-ray diffraction measurement using the Cu-Kα ray, and a specific surface area X (m2/g) and an oxygen density Y(ppm) satisfies a condition of X2/Y ≤1.3×10-5.