| 摘要 |
<p>PROBLEM TO BE SOLVED: To restrain corrosion of a nickel sintered base board, to restrain reduction in a strength characteristic of the nickel sintered base board, and to restrain conversion of an active material intoγ-NiOOH at charging time by covering the surface of the nickel sintered base board with a mixed oxide layer being mainly composed of cobalt oxide and containing a small quantity of iron oxide. SOLUTION: In a mixed oxide layer, and in the mole ratio of iron oxide to cobalt oxide, when the cobalt oxide is denoted by 100, the iron oxide is 0.5 to 5, and both are desirably uniformly mixed together. Cobalt oxyhydroxide is desirable as the cobalt oxide, and iron hydroxide is desirable as the iron oxide. A nickel sintered base board by forming a sintered body of nickel powder on both surfaces of a metallic core material, is dried at 80 to 150 deg.C after being soaked and impregnated into a mixed salt aqueous solution of a cobalt nitrate and an iron sulfate, and then, is soaked in an alkali aqueous solution to perform oxidation treatment at 100 to 180 deg.C in the air after substituting salt sticking to this base board with hydroxide.</p> |
