| 摘要 |
A negative electrode active material for a nickel-metal hydride battery of the present invention includes a hydrogen storage alloy, the hydrogen storage alloy containing La, Mg, Ni, Co, Al, and element M. The molar ratio y of Ni to the total of La and Mg is 2<=y<=3, the molar ratio z of Co to the total of La and Mg is 0.25<=z<=0.75, the molar ratio alpha of Al to the total of La and Mg is 0.01<=alpha<=0.05, and the molar ratio x of Mg to the total of La and Mg is 0.01<=x<=0.5. Element M represents at least one selected from the group consisting of Y and Sn, and the content of element M in the hydrogen storage alloy is 0.4 wt % or less.
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