NICKEL HYDROGEN STORAGE BATTERY

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PROBLEM TO BE SOLVED : To prolong the cycle life of an alkaline storage battery using a hydrogen storage alloy containing a rare earth element, Mg, Ni, and Al and in which intensity ratio IA/IBof the highest peak intensity IAappearing in a range of 2[!theta!]=30-34° and the highest peak intensity IBappearing in a range of 2[!theta!]=40-44° is 0.1 or more in the X-ray diffraction measurement using Cu-Kα rays. SOLUTION : The nickel hydrogen storage battery comprising a positive electrode 1, a negative electrode 2 using the hydrogen storage alloy, and an alkaline electrolyte uses the hydrogen storage alloy containing at least the rare earth element, Mg, Ni, and Al, and in which intesity ratio IA/IBof the the highest peak intensity IAappearing in the range of 2[!theta!]=30-34° and the highest peak intensity IBappearing in the range of 2[!theta!]=40-44° is 0.1 or more in the X-ray diffraction measurement using Cu-Kα rays as the X-ray source, and 1.0 wt% or less Mn to the hydrogen storage alloy is included in the nickel hydrogen storage battery. COPYRIGHT : (C)2005, JPO&NCIPI