| abstract |
An object of the present invention is to provide a hydrogen storage alloy capable of providing a nickel metal hydride battery excellent in charge / discharge cycle performance, a method for producing the same, and a nickel metal hydride storage battery excellent in charge / discharge cycle performance. A hydrogen storage alloy comprising at least Mm, Mg, Ni, Co, Mn and Al as a constituent component is a hydrogen storage alloy characterized by having a hydrogen storage main phase and a Mn-Al phase. The above problems can be solved. At this time, in the AB type 5 alloy, the element ratio of Mg to (Mm + Mg) in the raw material is preferably 0.02 or more and 0.06 or less, and cooling of the molten metal is slow cooling such as natural cooling. It is recommended. Moreover, the performance of a nickel metal hydride battery becomes more excellent by performing an alkali-soluble component removal process. [Selection figure] None |