| abstract |
(57) [Summary] [PROBLEMS] To achieve high capacity of an alkaline storage battery while simultaneously increasing high-rate discharge characteristics and charging efficiency at high temperatures, and further reducing the size. SOLUTION: A nickel electrode active material for an alkaline storage battery includes nickel hydroxide, a cobalt compound having an oxidation number of cobalt of more than 2 valence, ytterbium, erbium, It contains at least one element selected from the group consisting of lutetium and thulium, and d = 0.885 ± 0.008n in an X-ray diffraction diagram by Kα ray of cobalt. m, d = 0.838 ± 0.01 nm and d = 0.75 A rare earth element compound having a diffraction peak at 9 ± 0.007 nm. |