| 摘要 |
PURPOSE:To prevent a nickel sintered body from being eroded in a cadmium nitrate solution and improve the voltage characteristics during discharging by sintering a sintered nickel substrate in the reducing gas atmosphere and naturally cooling the substrate in the air after it has been cooled to a specific temperature. CONSTITUTION:Carbonyl nickel powder is sintered in the reducing atmosphere (about 800 deg.C), and after the sintering is completed and when a substrate is cooled to a temperature of 700-300 deg.C, it is naturally cooled in the air to form a nickel oxide layer with acid resistance on the surface of the sintered body. Accordingly, the nickel sintered body can be prevented from being eroded by an acid cadmium nitrate solution when the nickel sintered body is immersed in the cadmium solution and is electrolytically reduced and is filled with an active material by use of a simple method, thus the discharge characteristics of a Ni- Cd cell can be improved. |
