摘要 |
PROBLEM TO BE SOLVED: To provide an alloy powder which improves the hydrogen gas generation quantities before and after a discharge and large-current discharge characteristics and suitable for a negative electrode active material by adding an inhibitor to the power containing specific quantities of Bi, Sn, Ti and not containing noxious materials such as Hg, Cd, Pb, having an appearance specific gravity within a specific range, and mixed with two or more kinds with different grain sizes. SOLUTION: A Zn-base alloy contains Bi and Sn within the range of 0.001-0.5 wt.% respectively and Ti within the range of 0.001-0.5 wt.% with respect to pure Zn. The Zn base alloy is made of a powder mixed with two or more kinds with different grain sizes for increasing the specific surface area without making the voids of the alloy powder of this composition large. The powder with the appearance specific gravity of 1.0-1.5 g/cm<3> under an inhibitor adding condition is used. Secondary indium oxide is preferably added within a range of 0.03-0.4 wt.% as the inhibitor, for example. |