Alkaline storage battery

摘要

Disclosed is a sealed alkaline storage battery with an increased utilization of a positive electrode active material comprising a nickel oxide and with drastically enhanced capacity density. The positive electrode active material is a nickel based multi-metals oxide containing at least one element such as Mn, Al, Co, Cr, Fe, Zr and Bi which promotes the formation of gamma phase during charging. The ratio A gamma /A beta of the integrated intensity A gamma of the diffraction peak at d = about 7 angstroms attributed to the gamma phase to the integrated intensity A beta of the diffraction peak at d = about 4.5 to 5.0 angstroms attributed to the beta phase of the oxide in the completely charged state is not smaller than 0.4. The electrolyte comprises an aqueous solution containing at least one of K<+> and Na<+> as a cationic component and the total concentration of the above-mentioned cationic component in the completely charged state is within a range between 4 and 12 mol/l.