Method for producing graphene-based composite negative electrode material, and manufactured negative electrode material and lithium ion secondary battery

摘要

The invention relates to a graphene-based composite negative electrode material, a preparation method thereof and a lithium ion battery. The method comprises the following steps: (1) uniformly mixing a graphite raw material and graphite oxide, thereby obtaining a mixed material; (2) adding an adhesive into the mixed material for kneading, thereby obtaining a kneading material; (3) rolling the kneading material, thereby obtaining a sheet material; (4) grinding the sheet material, thereby obtaining a powder material; (5) pressing the powder material, thereby obtaining a pressed product; and (6) performing graphitization treatment on the pressed product in a protective atmosphere, thereby obtaining the graphene-based composite negative electrode material. The negative electrode material prepared by the method is stable in structure and has high specific capacity, high electrical conductivity, high rate performance and excellent liquid absorption performance and cycle performance, and can meet various requirements in application.