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

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A negative electrode material for a nickel-metal hydride battery containing a hydrogen-absorbing alloy represented by a general formula : Mm 1-a T 1 a Ni x Al y Mn z Co b T 2 c, in which : Mm is at least one of light rare earth elements; T 1 is at least one selected from the group consisting of Mg, Ca, Sr and Ba; T 2 is at least one selected from the group consisting of Sn, Cu and Fe; and 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 are satisfied.