The invention discloses a preparation method of a
lithium ion battery
silicon-carbon
anode material. The preparation method comprises following steps: 1,
raw material silicon powder is subjected to ball milling so as to obtain nanoscale
silicon powder; 2, the nanoscale silicon
powder is mixed with a conductive agent via
solid phase material mixing; 3,
liquid phase coating is adopted so as to formamorphous
carbon coating layers on the surfaces of the nanoscale silicon powder and the conductive agent; 4, an obtained coated material is subjected to high temperature
sintering in a furnace under
inert gas protection; 5, mechanical ball milling is adopted to prepare a silicon-carbon material with an appropriate particle size; and 6, the silicon-carbon material is mixed with commercial graphiteso as to obtain the
lithium ion battery silicon-carbon
anode material. The preparation method is capable of increasing the primary coulombic efficiency and the
cycling performance of the
lithium ion battery silicon-carbon
anode material, the process is simple, efficiency is high, the preparation method is friendly to the environment, and is beneficial for large scale production of silicon-carbon anode materials.