NICKEL-METAL HYDRIDE STORAGE BATTERY

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PROBLEM TO BE SOLVED : To increase the charging capacity of a nickel-metal hydride storage battery, and also to improve the cycle life characteristics thereof. SOLUTION : The nickel-metal hydride storage battery includes a negative electrode that contains a hydrogen-absorbing alloy mainly composed of M1 elements, calcium, magnesium, and M2 elements, and aluminum hydride. The M1 elements is one or two or more kinds of elements (including at least a rare earth element) selected from a group consisting of rare earth elements, group 4A elements, group 5A elements, and Pd. The M2 elements is one or two or more kinds of elements (including at least nickel) selected from a group consisting of group 6A elements, group 7A elements, group 8 elements (excluding Pd), group 1B elements, group 2B elements, and group 3B elements. The content of the M2 elements in the hydrogen-absorbing alloy is larger than three times and less than five times the total content of the M1 elements, calcium, and magnesium. The content of calcium in the hydrogen-absorbing alloy is ≥0.5 atom%, and the content of aluminum as an M2 element in the hydrogen-absorbing alloy is ≥0 atom% and ≤1.5 atom%. COPYRIGHT : (C)2011, JPO&INPIT