| 摘要 |
PROBLEM TO BE SOLVED: To provide a nickel electrode having extremely high active material utilization factor by using complex particles, consisting of base substance particles containing nickel hydroxide covered with two layers of an inner layer which consists of a sodium-containing cobalt compound and an outer layer consisting of cobalt hydroxide or cobalt monoxide. SOLUTION: An aqueous solution of sodium hydroxide is added to a particle powder consisting of a base substance particle containing nickel hydroxide, and a metal cobalt layer or a cobalt compound layer such as cobalt hydroxide layer, cobalt monoxide layer, or cobalt oxyhydroxide layer formed on the surface thereof, and the resulting mixture is heated in the presence of oxygen to form a coating inner layer consisting of a sodium-containing cobalt compound. According to the process of forming the coating inner layer, a coating outer layer consisting of a metal cobalt layer, cobalt hydroxide layer or cobalt monoxide layer is provided on the coating inner layer to form a nickel electrode having an active material powder consisting of a complex particle. The sodium content of the coating inner layer is preferably 0.1-10 wt.%. |
