HYDROGEN ABSORPTION ALLOY POWDER, NEGATIVE ELECTRODE, AND NICKEL-HYDROGEN SECONDARY CELL

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Hydrogen storage alloy powder, an anode, and a nickel-hydrogen rechargeable battery are provided, which are excellent in low-temperature characteristics and both in initial activity and cycle life at the same time, which properties are trading-off in conventional nickel-hydrogen rechargeable batteries. The alloy powder has a composition represented by formula (1) R1-aMgaNibAlcMd (R : rare earth elements including Sc and Y, or the like; 0.005 ≤ a ≤ 0.40, 3.00 ≤ b ≤ 4.50, 0 ≤ c ≤ 0.50, 0 ≤ d ≤ 1.00, 3.00 ≤ b+c+d ≤ 4.50), and has an arithmetical mean roughness (Ra) of the powder particle outer surface of not less than 2 µm, or a crushing strength of not higher than 35, 000 gf/mm2.