| 摘要 |
PROBLEM TO BE SOLVED: To provide a dense nickel hydroxide used as a positive electrode in an alkaline storage battery, which has a higher utilization factor and a cycle with suppressed degradation under higher temperature. SOLUTION: A dense nickel hydroxide used as a positive active material in an alkaline storage battery comprises a solid solution including 3 to 8% by weight of zinc, 0.5 to 5% by weight of cobalt, and 0.1 to 3% by weight of at least either of yttrium and calcium. The nickel hydroxide has, in its (101) plane by the X-ray diffraction, peak widths at half height of 0.85 to 1.2 deg./2θ, tapping densities of 2.0 g/cc or more, specific surface areas of eight to 30m<2> /g, and mean particle sizes of five to 15μm. |
