▎ 摘　　要

NOVELTY - The preparation of a high-conductivity graphene composite material involves: mixing deionized water, absolute ethyl alcohol and isopropanol, adding 2.5-6 wt.% a dispersant and 7-11 wt.% a reducing agent, stirring for 20-25 minutes to obtain solution A; adding graphene oxide, and performing ultrasonic dispersion to obtain a solution B; weighing copper nitrate and silver nitrate, sequentially adding the solution B, and stirring the mixture for 30 minutes at 65 ℃ to obtain a solution C; adding the solution B into the solution C under stirring to obtain a solution D; weighing carbon black powder and graphite micropowder, and adding the solution D to obtain a solution E; and transferring the solution E into a reaction kettle at 230 ℃ for 4 hours, taking out the obtained liquid, and freeze-drying for 15 hours. In the composite material, graphene is used as a conductive network structure of graphite micropowder to connect micro-areas. USE - The preparation of a high-conductivity graphene composite material useful in power type lithium-ion battery field. ADVANTAGE - The point-line-surface combined multidimensional graphene composite material conductive network constructed overcomes the defect of poor point-point contact of the conventional conductive agent for the lithium-ion battery, and realizes the remarkable improvement of the conductivity of the composite material body. The method adopts an in-situ reaction method, the obtained composite material is uniform and stable, and the problem of nonuniform dispersion of the existing related products is solved. The method has the advantages of simple process, short flow, easily obtained raw materials and easy realization of industrialization and large-scale popularization. DESCRIPTION OF DRAWING(S) - The drawing shows an electron microscope of the highly conductive composite graphene composite material. (Drawing includes non-English language text).