| 摘要 |
PURPOSE:To enhance the leave-off characteristic performing a preliminary drying of active substance till the specified amount the water contained in a pos. electrode plate at a certain temp. after taking out the pos. electrode plate from a chemical formation trough, and performing the drying process for the active substance at a certain temp. until a level lower than the specified is obtained. CONSTITUTION:In the condition that the amount of water contained in an electrode plate is large in the initial period of drying, a preliminary drying is made at a low temp. of 40 deg.C, and after the amount of water in the electrode plate is decreased to a certain level below the specified, a short drying is performed at a high temp. of 150-200 deg.C. After completion of chemical formation, rinse with water is performed one min, and the drying conditions are examined comparatively. After pouring of electrolyte, the initial capacity after discharging is measured, and a constant voltage charging is performed followed by charge leaving at 40 deg.C. The ratio of residual capacity exhibits the optimum value when the amount of water in the electrode plate before drying at 105 deg.C is 0.04g/1gAM, and exhibits a decrease in both cases larger and smaller than that value. The attached diagram indicates the relationship between the drying temp after 40 deg.C preliminary drying and the ratio of residual capacity after leaving at 40 deg.C for two weeks. The 40 deg.C preliminary drying conditions shall be constant for one hour, and subsequent drying is set to a time in which the water content decreases to 0.005g/1gAM. After 40 deg.C preliminary drying, the ratio of residual capacity will be more enhanced if subsequent drying is made with a higher temp. and in a shorter time. |
