accumulator service water element occlusion alloy

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PROBLEM TO BE SOLVED : To provide a secondary battery hydrogen storage alloy exhibiting a long cycle life and a high discharge capacity. SOLUTION : The secondary battery hydrogen storage alloy is represented by (RxMy)*(NiaCobMncAld) (wherein R is a rare earth-mixed metal containing ≥75% of La; M is one metal selected from Ti, Zr and Hf; and x+y=1, 0.002≤yCOPYRIGHT : (C)2008, JPO&INPIT