NEGATIVE ELECTRODE MATERIAL FOR NICKEL-METAL HYDRIDE BATTERY AND TREATMENT METHOD THEREOF, AND NICK

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A negative electrode material for a nickel-metal hydride battery containing a hydrogen-absorbing alloy represented by a general formula : Mm1-aT1aNixAlyMnzCobT2c, in which : Mm is at least one of light rare earth elements; T1 is at least one selected from the group consisting of Mg, Ca, Sr and Ba; T2 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.