HYDROGEN STORAGE ALLOY POWDER AND ALKALINE STORAGE BATTERY

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PROBLEM TO BE SOLVED : To improve the endurance characteristics of an alkaline storage battery using hydrogen storage alloy powder with a low cobalt content as a negative electrode active material. SOLUTION : The alkaline storage battery 1 includes an electrode plate group 13 in which a positive electrode 10 and a negative electrode 11 are wound via a separator 12 interposing therebetween, an alkali electrolytic solution, and a bottomed cylindrical battery case 14 that accommodates the electrode plate group 13 and the alkali electrolytic solution therein. In the alkaline storage battery, the hydrogen storage alloy powder is used as the negative electrode active material contained in the negative electrode 11, the hydrogen storage alloy powder having a CaCu5-type crystal structure that consists of misch metal (Mm : a mixture that consists mainly of a rare earth element), nickel (Ni), manganese (Mn), aluminum (Al), and cobalt (Co), wherein the total molar ratio of Ni, Mn, Al, and Co to Mm is 5.25-5.45, the molar ratio of Co to Mm is 0.15-0.35, and the half-value width ratio (002)/(200) in a powder X-ray diffraction is 0.80-1.25. COPYRIGHT : (C)2013, JPO&INPIT