HYDROGEN STORAGE ALLOY, AND ELECTRODE FOR NICKEL-HYDROGEN BATTERY

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A hydrogen-absorbing alloy, which is used as a negative electrode material of nickel-metal hydride secondary batteries for hybrid electric vehicles, and particularly for batteries to drive electric motors of hybrid electric vehicles, is an AB5-type alloy having a CaCu5-type crystal structure and the general formula R Nia Cob Alc Mnd (R : mixture of rare earth metals), wherein 4.15≦a≦ 4.4, 0.15≦b≦0.35, 1≦c/d≦1.7, 5.25≦a + b + c + d≦5.45.