Method for applying normal-temperature modified natural graphite to lithium battery negative electrode material

The invention discloses a method for applying normal-temperature modified natural graphite to a lithium battery negative electrode material, which is used for performing asphalt coating modification on natural graphite powder through a plasma discharge auxiliary ball milling method in a room-temperature environment, and comprises the following steps: (1) adding the natural graphite powder into asphalt and mixing to form a material, the ratio of the natural graphite powder to the asphalt is 100: (5-20), and the material and the ball material are put into a plasma-assisted ball milling tank according to the mass ratio of 10: 1; and (2) adding absolute ethyl alcohol as a process control agent, carrying out plasma discharge auxiliary ball milling in a plasma neutral gas atmosphere of 0.1-0.5 atmospheric pressure, controlling the ball milling rotating speed to be 1000-1500r/min, the external electric field voltage to be 10-15KV, the current to be 1.0-1.5 A, and taking out powder after ball milling for 2-4 hours. T