| abstract |
Provided is an alloy powder for an electrode for a nickel metal hydride storage battery having a high battery capacity and excellent life characteristics and high temperature storage characteristics. The hydrogen storage alloy contained in the electrode alloy powder contains the elements L, M, Ni, Co, and E, and L contains La as an essential component and does not contain Nd or occupies L when Nd is contained. The ratio of Nd is less than 5% by mass, the ratio of La in the hydrogen storage alloy is 23% by mass or less, M is Mg, Ca, Sr, and / or Ba, and occupies the total of L and M The molar ratio α of M is 0.045 ≦ α ≦ 0.133, the molar ratio x of Ni to the total of L and M is 3.5 ≦ x ≦ 4.32, and the molar ratio y of Co is 0.8. The molar ratio z of 13 ≦ y ≦ 0.5, x, y, and E satisfies 4.78 ≦ x + y + z <5.03. |