The hydrogen storage alloy and its manufacturing method

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PROBLEM TO BE SOLVED : To provide a hydrogen storage alloy and a method for producing it in which, more in detail, a use ratio of cobalt is made extremely small, and Fe is used as an indispensable element, and the production cost is made inexpensive. SOLUTION : This AB5 type hydrogen storage alloy has a crystal structure of a CaCu5 type, in which A denotes Mm(misch metal), B denotes Nia Mnb Alc Cod Fee, and a compositional ratio has the following relation, with provide, in Nia Mnb Alc Cod Fee, 4.05<=a<=4.3, 0.2<=b<=0.5, 0.25<=c<=0.4, b+c<=0.8, 0<=d<=0.3, 0.1<=e<=0.3, and 5.1<=a+b+c+d<=5.3.