| 摘要 |
Provided is a hydrogen occlusion alloy suitable for a negative electrode material of a closed type nickel hydride secondary cell in which the increase of gas pressure in the cell during overcharging is prevented and self discharge in the open circuit state would be effectively inhibited, being represented by the following compositional formula: ANiaCobMncXd wherein A is a misch metal containing not more than 60% by weight of Ce, X is at least one element selected from the group consisting of Al, Cu, Mo and Zn, and a, b, c and d are numbers satisfying the following relations: 0.4 <b<2.0, 0~c<0.2, 0.1<d<2.0, and 4.55<a+b+c+d<4.80. |
