A Modified Acrylic Binder Used for the Graphite Negative Electrode in Lithium Ion Batteries

The water-based binder has the advantages of non-toxic, non-flammable, small odor and no pollution to the environment. However, there are problems such as low bond strength and poor battery cycle life of commonly used binders on the market. In this paper, the acrylic binder is modified. Acrylic acid/methacrylic acid, acrylonitrile, and octadecyl acrylate/octadecyl methacrylate are copolymerized at high temperature, and a new binder for graphite anode is successfully developed. The binder can significantly improve the affinity between the graphite anode and the electrolyte and the integrity of the graphite particles during the cycle, so that the battery has better electrochemical performance. During the charge and discharge cycle of 1 C, the graphite anode coated with PAANa as a binder was able to cycle 360 cycles and remain stable, far better than the 192 cycles of the commercial binder LA133. It is proved that the experimental formula has a certain commercial application prospect.