Patent ID: 6013390
Filing Date: 2000-01-11
Classification: H01M,Y02E

Abstract:
An alkaline storage battery comprising a positive electrode having as a main material an active material of a nickel based multi-metals oxide containing at least one element selected from the group consisting of Mn, Al, Co, Cr, Fe, Zr and Bi, a negative electrode, a separator and 1.0 to 2.7 ml of an electrolyte per Ah of the positive electrode capacity, wherein said nickel based multi-metals oxide reversibly cycles between the .beta.(II)-phase and the .gamma.(III)-phase during charge/discharge cycling of the battery and said nickel based multi-metals oxide in its completely charged state has a .gamma. phase having a diffraction peak at an interlayer spacing d of about 7 angstroms in the powder x-ray diffraction, the ratio A.sub..gamma. /A.sub..beta. of the integrated intensity A.sub..gamma. of the diffraction peak at d=about 7 angstroms attributed to the .gamma. phase to the integrated intensity A.sub..beta. of the diffraction peak at d=about 4.5 to 5.0 angstroms attributed to the .beta. phase of said nickel based multi-metals oxide in its completely charged state is not smaller than 0.4, said electrolyte comprises an aqueous solution containing at least one of K.sup.+ and Na.sup.+ as a cationic component, and the total concentration of said cationic component in said electrolyte in the completely charged state is within a range between 4 and 12 mol/l.