HYDROGEN STORAGE ALLOY, NICKEL HYDROGEN STORAGE BATTERY AND PRODUCTION METHOD OF HYDROGEN STORAGE A

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PROBLEM TO BE SOLVED : To provide a hydrogen storage alloy capable of keeping power output characteristics of a nickel hydrogen storage battery at a high level, a nickel hydrogen storage battery provided with the hydrogen storage alloy as the negative pole electrode and a production method of a hydrogen storage alloy. SOLUTION : A hydrogen storage alloy is composed of AB5 type alloy : element A is based on a rare earth element; and element B is based on nickel and contains aluminum and/or manganese. In the cross section of the hydrogen storage alloy, the ratio of regions where aluminum and manganese are present in relatively high concentrations is 0.5% or higher. The hydrogen storage alloy is used as the negative pole electrode of a nickel hydrogen storage battery. COPYRIGHT : (C)2016, JPO&INPIT