HYDROGEN STORAGE ALLOY AND SEALED ALKALINE STORAGE BATTERY USING THE SAME

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PROBLEM TO BE SOLVED : To provide a rare earth-Mg-Ni system hydrogen storage alloy having high alkali resistance and a low price; and to provide a sealed alkaline storage battery having high capacity and high cycle characteristics, of a low price. SOLUTION : The sealed alkaline storage battery contains hydrogen storage alloy particles 36 in a negative electrode plate 26, and the hydrogen storage alloy has a composition represented by general formula : (CeaPrbNdcYdAe)1-wMgwNixAlyTz. In the formula, A represents at least one element selected from the group comprising Pm, Sm or the like, T represents at leans one element selected from the group comprising V, Nb or the like, a, b, c, d, e each satisfies the relation of a>0, b≥0, c≥0, d≥0, e≥0, a+b+c+d+e=1, and w, x, y, z each is in a range specified by 0.08≤w≤0.13, 3.2≤x+y+z≤4.2, 0.15≤y≤0.25, 0≤z≤0.1. COPYRIGHT : (C)2008, JPO&INPIT