| abstract |
The invention relates to a polymer binder containing a soft phase region and a hard phase region, a preparation method thereof and its application in a lithium ion battery. The hard phase region of the binder is obtained by polymerizing a rigid monomer A, and the The soft phase region is obtained by polymerizing flexible monomer B and monomer C containing dynamic interaction groups. The repeating unit in the hard phase region enables the adhesive to have high mechanical strength; the repeating unit group in the soft phase region has excellent segment mobility and a certain amount of repairing groups, thereby endowing the adhesive with good flexibility and flexibility. Self-healing ability. The adhesive of the present invention has high mechanical strength, excellent adhesion, good flexibility and self-healing ability. Therefore, the adhesive of the present invention can be widely used in silicon negative electrodes or silicon/graphite mixed negative electrodes, and especially when used in silicon negative electrodes, the expansion of the negative electrode pole pieces can be significantly reduced, and the damage to the bonding network caused by the expansion of the silicon negative electrode can be repaired, thereby significantly reducing the Improve the cycling performance of silicon anodes. |