| 摘要 |
Provided are a hydrogen absorption alloy powder, a negative electrode, and a nickel-hydrogen secondary cell, capable of simultaneously possessing excellent initial activity and cycle properties as well as low temperature properties, which are trade-offs in a nickel-hydrogen secondary cell. The alloy powder is characterized in having a composition expressed by the formula R1-aMgaNibAlcMd (where R includes rare earth elements and similar, including Sc and Y; 0.005<=a<=0.40; 3.00<=b<=4.50; 0<=c<=0.50; 0<=d<=1.00; and 3.00<=b+c+d<=4.50), the arithmetic average roughness (Ra) of the outer surface of the powder being at least 2 µm and the crushing strength of the powder being no more than 35,000 gf/mm2. |
