| abstract |
(57) [Summary] [Object] To provide a hydrogen storage electrode which is excellent in both cycle characteristics and high-temperature characteristics even when it is substituted with a large amount of Al. [Structure] The rational formula based on the atomic ratio is LnNi x Al y M v (Ln is a mixture of misch metal or rare earth metal, M is Fe, Co, Mn, Cu, Cr, Si, Nb, At least one of B and x, y, v is 3.5 <X ≦ 5.0, 0.9 ≦ y ≦ 2.5, 0 <v <1.6, 4.4 <x + y + v ≦ 6.0), and metallic cobalt powder is physically added in the range of 3 to 20% by weight to the powder of the hydrogen storage alloy. To do. |