HYDROGEN-ABSORBING ALLOY AND NICKEL-HYDROGEN STORAGE BATTERY

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Provided is a nickel-hydrogen storage battery that uses as the negative pole active material an La-Mg-Ca-Ni hydrogen-absorbing alloy in order to increase discharge capacity and improve cycle life properties. The hydrogen-absorbing alloy is represented by the general formula Ｍ１ｕＭｇｖＣａｗＭ２ｘＮｉｙＭ３ｚ・・・・(１)(where M1 is one, two, or more elements selected from rare earth elements; M2 is one, two, or more elements selected from the group consisting of elements of groups 3A, 4A, and 5A of the Periodic Table of Elements and Pd (excluding rare earth elements); M3 is one, two, or more elements selected from the group consisting of elements of groups 6A, 7A, 8, 1B, 2B and 3B of the Periodic Table of Elements (excluding Ni and Pd); and u, v, w, x, y, and z are numbers that satisfy 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 the nickel-hydrogen storage battery has a negative electrode comprising the hydrogen-absorbing alloy.