HYDROGEN-ABSORBING ALLOY AND NICKEL-METAL HYDRIDE RECHARGEABLE BATTERY

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The present invention aims to increase the discharge capacity and to improve the cycle life performance in a nickel-metal hydride rechargeable battery using a La—Mg—Ni based hydrogen-absorbing alloy as an active material of a negative electrode. The present invention provides a hydrogen-absorbing alloy represented by the general formula (1) : M1uMgvCawM2xNiyM3z . . . (1) (wherein, M1 is one or more elements selected from rare earth elements; M2 is one or more elements selected from the group consisting of Group 3A elements; Group 4A elements, Group 5A elements, and Pd (excluding rare earth elements); M3 is one or more elements selected from the group consisting of Group 6A elements, Group 7A elements, Group 8 elements, Group 1B elements, Group 2B elements, and Group 3B elements (excluding Ni and Pd); u, v, w, x, y, and z are numbers satisfying, u+v+w+x+y+z=100, 3.4≦v≦5.9, 0.8≦w≦3.1, 0≦(x+z)≦5, and 3.2≦(y+z)/(u+v+w+x)≦3.4), and a nickel-metal hydride rechargeable battery including a negative electrode containing the hydrogen-absorbing alloy.