| 摘要 |
PROBLEM TO BE SOLVED: To enhance an active material utilization factor and improve a high- rate discharge characteristic by applying etching to a metal porous substrate and by applying cobalt-plating to it. SOLUTION: This nickel electrode is made by filling an active material containing nickel hydroxide as a main constituent in a metal porous substrate. When etching and cobalt-plating are applied to the substrate, the surface of the substrate is roughened and unevenness is imparted to it. Thereby, the coming-off of the active material from the substrate is prevented, and the contact area of the active material to the substrate can be increased. The plated cobalt is electrochemically oxidized during initial charging, a conductive layer of high-order cobalt oxyhydroxide is formed in the vicinity of the substrate, and the active material is connected to the substrate, so that a battery having a high active material utilization factor and an excellent high-rate discharge characteristic can be provided. A cobalt-plating amount of the substrate is preferably set to 0.3-10 mg/cm2. |
