| 摘要 |
PURPOSE: To lighten the corrosion of a collector at coating of paste so as to improve the yield rate of manufacture by neutralizing the alkaline ingredients in paste, and then, pasting it on the collector so as to form a positive electrode plate. CONSTITUTION: In a positive electrode plate 5, 3 pts.wt. of acetylene black and 7 pts.wt. of fluororesin binder 7 are mixed to 100 pts.wt. of LiCoO2 powder being an active material and this is suspended in the aqueous solution of carboxymethyl cellulose into paste form. The alkaline ingredients in lithium composite oxide paste are neutralized to put the pH of paste to 7-11 by agitating the suspension while ventilating carbonic acid gas at the rate of 2l/min. in the suspension at the time of makeup of the paste. This is overlaid on both sides of the collector consisting of aluminum foils 30μm thick, and after dry, it is rolled into 0.17mm in thickness with a rolling press, and then it is cut in specified dimension to make positive electrode plate 5. Positive electrode plates 5 and negative electrode plates 6 are counterposed to each other through separators 7, and those are wound in spiral shape to form a group of electrode plates 4. |
