Silicon-carbon negative electrode material and preparation method and application thereof

The invention discloses a silicon-carbon negative electrode material and a preparation method and application thereof, and the method comprises the following steps: mixing a dispersant, organosilane and silicon to obtain silicon-containing slurry; grinding the silicon-containing slurry to obtain nano silicon slurry; mixing the nano silicon slurry with an organic carbon source, and drying to obtain composite powder; carrying out first calcining treatment on the composite powder, and forming a carbon-containing first coating layer on the surface of the nano silicon; mixing the nano silicon with the first coating layer and carbon-containing organic gas, and then carrying out second calcining treatment to form a carbon-containing second coating layer on the first coating layer; and mixing the nano silicon with the two coating layers with graphite and an organic carbon source, and carrying out third calcination treatment to obtain the silicon-carbon negative electrode material. The method is simple in production p