NEGATIVE-ELECTRODE MATERIAL FOR NICKEL HYDROGEN BATTERY, METHOD OF TREATING THE SAME, AND NICKEL H

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A negative-electrode material for nickel hydrogen batteries which comprises a hydrogen-occluding alloy represented by the general formula Mm1-aT1aNixAlyMnzCobT2c, wherein Mm is at least one light rare-earth element, T1 is at least one member selected from the group consisting of Mg, Ca, Sr, and Ba, T2 is at least one member selected from the group consisting of Sn, Cu, and Fe, and a, x, y, z, b, and c satisfy 0.015≤a≤0.5, 2.5≤x≤4.5, 0.05≤y+z≤2, 0≤b≤0.6, 0≤c≤0.6, and 5.6≤x+y+z+b+c≤6.