Mechanical reforming method of natural graphite by ball milling and modified natural graphite negative electrode material

摘要

The invention relates to a modification method of natural graphite ball-milling machinery and a modified natural graphite negative electrode material. The method comprises the following steps: adding grinding balls, a ball-milling medium and graphite powder into a ball-milling tank according to a mass ratio of (0.5-20):(0.1-10):1, performing ball milling on ball-milling equipment for 2-120 minutes according to a rotating speed of not more than 600 revolutions per minute, removing the ball-milling medium, and drying. The method can achieve the aims of improving the first discharge efficiency of natural graphite, reducing the irreversible capacity and improving the cycle performance of natural graphite through a low-cost ball-milling machinery modification technology.