NICKEL-HYDROGEN STORAGE BATTERY

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PROBLEM TO BE SOLVED : To raise an actuation voltage and improve a cycle lifetime in a nickel-hydrogen storage battery using a rare-earth group-nickel based hydrogen storage alloy containing Mg or the like and having a crystal structure other than CaCu5 type as a negative electrode. SOLUTION : In the nickel-hydrogen storage battery provided with a positive electrode 1, a negative electrode 2 using the hydrogen storage alloy, and an alkaline electrolytic solution, and in X-ray diffraction measurement using a Cu-Kα ray as X-ray source, the hydrogen storage alloy is used which contains at least rare earth group element, Mg, Ni, and Al in the negative electrode, and in which intensity ratio IA/IB of the strongest peak intensity IA appearing within the range of 2[!theta!]=30° to 34° and the strongest peak intensity IB appearing within the range of 2[!theta!]=40° to 44° is 0.1 or more, and a cobalt compound is added to this negative electrode. COPYRIGHT : (C)2006, JPO&NCIPI