| 摘要 |
PURPOSE:To prevent carbon powder from peeling to eliminate the decrease of battery's capacity as the charge and discharge cycles are repeated by using a mixture of polyfluorovinylidene and polymethacrylate as a binder for kneading with carbon powder for a negative electrode. CONSTITUTION:Regarding a battery BA1, a positive pole 1 and a negative electrode 2 are coiled while having a separator 3 between them and put in a negative electrode can 7. The negative pole 2 is prepared by kneading carbon powder such as natural graphite, etc., with a binder of a mixture consisting of polyfluorovinylidene and polymethacrylate, sticking it to a collector by rolling method, etc., and uniting them. As the suitable polymethacryl-ate, poly(methyl methacrylate) is used because of high adhesion property to metals for the collector such as aluminum, etc. The proper mixing ratio of the polymethacrylate to the binder is 10-90wt.%. |
