Hydrogen absorption alloy powder, negative electrode, and nickel-hydrogen secondary cell
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United States of America Patent
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Jan 2, 2018
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Feb 7, 2013
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Feb 9, 2012
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Abstract
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.
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