| 摘要 |
PURPOSE:To retard the coarse crystal growth of an active material and to enhance the utilization of the active material by previously adding alkali earth metal salt in a cadmium nitrate aqueous solution into which a sintered nickel plate is immersed. CONSTITUTION:When a porous sintered nickel plate is immersed in a cadmium nitrate aqueous solution, then immersed in an alkaline solution to convert the cadmium nitrate into cadmium hydroxide for impregnating an active material into the sintered plate, an alkali earth metal salt is previously added to the cadmium nitrate aqueous solution, and the porous sintered nickel plate is immersed in this aqueous solution, then immersed in the alkaline solution to convert the nitrate into the hydroxide for impregnating the active material. By this process, the coarse crystal growth or the coming off of the active material attendant on charge-discharge cycles is retarded, and a drop in conductivity is decreased. Therefore, the utilization of the active material is increased. |
