HYDROGEN STORAGE ALLOY FOR ALKALINE STORAGE BATTERY AND ALKALINE STORAGE BATTERY

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PROBLEM TO BE SOLVED : To prevent a hydrogen storage alloy from pulverization and deterioration of cycle life in case of repeatedly using an alkaline storage battery using the hydrogen storage alloy having a crystal structure other than that of CaCu5 type containing at least rare earth element, Mg, Ni, and Al, is used for an anode. SOLUTION : For the alkaline storage battery provided with a cathode 1, an anode 2, and alkaline electrolyte, an alloy of which ratio of main phase area composed of uniform metal structure having a prescribed composition is not less than 60%, expressed by general formula : Ln1-xMgxNiy-a-bAlaMb (in the formula, Ln is one kind of element chosen from rare earth element containing Y, Zr, and Ti; M is one kind of element chosen from V, Nb, Ta, Cr, Mo, Mn, Fe, Co, Ga, Zn, Sn, In, Cu, Si, P, B and Zr; 0.05≤x≤0.35; 0.05≤a≤0.30; 0≤b≤0.5; 2.8≤y-a-b≤3.9), is used for the anode. COPYRIGHT : (C)2006, JPO&NCIPI