| 摘要 |
PROBLEM TO BE SOLVED: To increase the discharge capacity in a high-rate discharge of a battery by adding cobalt oxyhydroxide to a nickel hydroxide at a specified ratio, and setting the average valence of Ni in the nickel hydroxide to a specified value. SOLUTION: A nickel electrode contains 1-10 wt.% in terms of cobalt atom of cobalt oxyhydroxide to a nickel hydroxide of active material. As a positive electrode active material, a nickel hydroxide having an average valence of Ni of 2.1-2.3 is used. The nickel hydroxide having an average valence of Ni within this range can be manufactured easily, for example, by dipping nickel hydroxide in an aqueous solution obtained by adding an alkali to a strong oxidant aqueous solution, such as hydrogen peroxide for a prescribed time. When one or more elements selected from among Zn, Mg, Ca, Mn, Al, Cd, Y, Co, Bi and lanthanoids is solid dissolved to this nickel hydroxide, swelling of the possible electrode active material can be suppressed. |
