| abstract |
(57) [Summary] [Object] In a hydrogen storage alloy electrode containing a hydrogen storage alloy containing at least nickel, cobalt, and aluminum, the activity in the initial stage of use in a battery is sufficiently improved, and hydrogen gas is sufficiently absorbed. In addition, a sufficient battery capacity can be obtained from the beginning, the internal pressure of the battery does not easily increase, and sufficient discharge characteristics can be obtained even when used at a low temperature. In a hydrogen storage alloy electrode including a hydrogen storage alloy containing at least nickel, cobalt, and aluminum, the sum of the abundance ratio of cobalt atoms and aluminum atoms in a portion extending from the surface of the hydrogen storage alloy to a depth of 30 ° is a, When the sum of the abundance ratios of the cobalt atoms and the aluminum atoms in the bulk region inside the occlusion alloy is represented by b, the condition of a / b ≧ 1.30 is satisfied. |