| 摘要 |
PURPOSE:To minimize the volume change of an active material at the time of charge and discharge cycle and improve cycle life by sintering a mixture mainly containing nickel powder to which silicic acid or a silicate is added. CONSTITUTION:A mixture mainly containing nickel powder and an adhesive paste to which silicic acid or a silicate is added is sintered to form a porous sintered base plate, and then the base plate is subjected to active material charging operation involving dipping to an acidic nickel salt solution. Hence, silicon forms an alloy with nickel on the sintered base plate surface layer, whereby, at the time of the dipping to acidic nickel salt solution to be successively conducted after sintering, corrosion can be prevented, growth of gamma-NiOOH can be suppressed, swelling of the positive electrode by repeat of charge and discharge can effectively be prevented, and a long-lived sintered type nickel positive electrode for alkali storage battery can be obtained. |
