| 摘要 |
PROBLEM TO BE SOLVED: To suppress the expansion of active material particles, and to improve the cycle life of a battery using a nonsintered nickel electrode, by including a specific amount of cobalt and zirconium, in the powder of a nickel hydroxide active material. SOLUTION: In the nickel hydroxide particles used in the positive electrode of an alkaline storage battery, at least cobalt; 0.2 to 5wt.%, and zirconium; 0.1 to 4wt.% are included. By using such a nickel hydroxide active material, a high capacity maintaining rate and a high temperature charging property of an alkaline storage battery is improved. Furthermore, by including zinc in the nickel hydroxide particles, while the form of the nickel hydroxide particles is made in a spherical form, it is favorable to improve the apparent density and the filling density. The paste of this active material mixture is filled to a porous base board for electric collecting and pressurized, and a nonsintered nickel electrode in which the filling density of the active material mixture is made about 2.4 to 2.9/cc is formed. |
