Patent ID: 6235428
Filing Date: 2001-05-22
Classification: H01M,Y02E

Abstract:
A sealed alkaline storage battery comprisinga positive electrode active material and a negative electrode active material packed in total in a battery can at 75% by volume or more of a content volume of the battery can, the negative electrode active material forming a zinc negative electrode and comprising a mixture of zinc and zinc oxide, and the positive electrode active material including 60 through 100 wt % of nickel oxyhydroxide including Mn as a solid-solution element and having a .gamma. ratio defined as follows of 65 through 100%, and 40 through 0 wt % of .alpha.-Ni(OH).sub.2 :.gamma. ratio (%)={S1/(S1+S2)}.times.100in which S1 indicates a peak area in a lattice plane (003) in an X-ray diffraction pattern of the nickel oxyhydroxide including Mn as a solid-solution element; and S2 indicates a peak area in a lattice plane (001) in the X-ray diffraction pattern of the nickel oxyhydroxide including Mn as a solid-solution element;wherein said X-ray diffraction patterns are obtained by X-ray diffraction analysis using a counter electrode of Cu, a tube voltage of 40 kV, a tube current of 100 mA and a filter of Ni.