HYDROGEN STORAGE ALLOY FOR ALKALINE STORAGE BATTERY, AND ALKALINE STORAGE BATTERY

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PROBLEM TO BE SOLVED : To enhance corrosion resistance and improve a cycle life of an alkaline storage battery in a state that hydrogen storing capacity in a hydrogen storage alloy for the alkaline storage battery is maintained high. SOLUTION : For a negative electrode 2 of the alkaline storage battery, a hydrogen storage alloy is used which is expressed by a general formula Ln1-xMgxNiy-a-bAlaMb (in the formula, Ln is at least one kind of element selected from rare earth elements containing Y, M is at least one kind of element selected from V, Nb, Ta, Cr, Mo, Mn, Fe, Co, Ga, Zn, Sn, In, Cu, Si, P, B, Zr, and Ti, and conditions of 0.05≤x≤0.35, 2.8≤y≤3.9, 0.05≤a≤0.30, 0≤b≤0.5 is satisfied), and in which a half value width Δ[!theta!]1 of the strongest peak appearing in a range of 2[!theta!]=44 to 46° is smaller than the half value width Δ[!theta!]2 of the strongest peak appearing in the range of 2[!theta!]=34.5 to 36.5° in an X-ray diffraction measurement using Cu-Kα ray as the X-ray. COPYRIGHT : (C)2007, JPO&INPIT