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

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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.