ALLOY POWDER FOR ELECTRODES, NEGATIVE ELECTRODE FOR NICKEL-METAL HYDRIDE STORAGE BATTERIES USING SAME, AND NICKEL-METAL HYDRIDE STORAGE BATTERY
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Jan 12, 2016
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Mar 31, 2015
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A hydrogen-absorbing alloy included in alloy powder for electrodes includes elements L, elements M, Ni, Co, and elements E. L include La as an essential component. L do not include Nd, or, even when L include Nd, the percentage of Nd in L is 5 mass % or less. Furthermore, M include at least Mg, E include at least Mn, and molar ratio α1 of Mg to the sum total of L and M satisfies 0.000<α1≦0.050. Molar ratio x of Ni to the sum total of L and M satisfies 3.50≦x≦4.32, and molar ratio y of Co to the sum total of L and M satisfies 0.13≦y≦0.50. Molar ratio x, molar ratio y, and molar ratio z of E satisfy 4.78≦x+y+z<5.03, and ratio y/β of molar ratio y to molar ratio β that is the ratio of Mn to the sum total of L and M satisfies 0.80≦y/β≦1.50.
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