| abstract |
The invention relates to a polymer binder containing a soft phase region and a hard phase region and its preparation method and application in lithium-ion batteries. The hard phase region of the binder is obtained by polymerizing a rigid monomer A. The soft phase region is obtained by polymerizing flexible monomer B and monomer C containing dynamic interaction groups. The repeating unit of the hard phase region makes the binder have high mechanical strength; the repeating unit group of the soft phase region has excellent chain segment motion ability and a certain amount of repairing group, thereby giving the binder good flexibility and self-healing ability. The adhesive of the invention has high mechanical strength, excellent cohesiveness, good flexibility and self-repairing ability. Therefore, the adhesive of the present invention can be widely used in silicon negative poles or silicon/graphite blended negative poles, especially when used in silicon negative poles, it can significantly reduce the expansion of the negative pole piece, and repair the bonded network damage caused by the expansion of the silicon negative pole, thereby significantly Improve the cycle performance of silicon anodes. |