Positive electrode active material for alkaline storage battery

摘要

A positive electrode active material, includes a beta -Ni(OH)2 type nickel oxide (including hydroxide) containing Mn in the state of solid solution or coprecipitated state with an average valence of Mn being 3.3 valences or more and preferably with a ratio A2/A1 being 1.25 or less which is a ratio of integrated intensity A2 of a peak present at 2 theta =18-21 DEG to integrated intensity A1 of a peak present at 2 theta =37-40 DEG of powder X-ray diffraction using CuK alpha ray.