| 摘要 |
PROBLEM TO BE SOLVED: To provide an alloy powder which improves the hydrogen gas generation quantities before and after discharge and the large-current discharge characteristic and it suitable for a negative electrode active material by adding an inhibitor to the power made of a Zn-based alloy containing specific quantities of Bi, Zr, Sn and not containing noxious materials such as Hg, Cd, Pb, having the appearance specific gravity within a specific range, and mixed with two or more kinds with different grain sizes. SOLUTION: A Zn-based alloy contains Bi, Rr, Sn within the range of 0.01-0.5 wt.% respectively with respect to pure Zn, and the Zn base alloy is made of the 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 an appearance specific gravity of 10-1.5 g/cm<3> under an inhibitor added condition is used. Secondary indium oxide is preferably added within a range of 0.03-0.4 wt.% as the inhibitor, for example. |
