Preparation method of silicon-carbon anode material for lithium-ion battery

The invention provides a preparation method of a silicon-carbon anode material for a lithium-ion battery. The method comprises the following preparation steps of (1) coating: carrying out carbon coating on silicon powder by adopting a vapor deposition method or a thermal coating method or a liquid-phase coating method to obtain carbon-coated silicon particles; (2) dispersion: uniformly dispersing the carbon-coated silicon particles into asphalt for growth to obtain carbon microspheres in which silicon particles are uniformly distributed; and (3) carbonization: mixing the carbon microspheres and other carbon materials through a VC high-efficiency mixer to obtain a silicon-carbon anode material. The prepared silicon-carbon material is uniform in silicon particle distribution and intact in surface coating; and the silicon particles are not in contact with an electrolyte basically and the carbon microspheres are capable of well accommodating volume expansion of the silicon particles, so that the silicon-carbon an