Surface modification method of silicon negative electrode material

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a surface modification method of a silicon negative electrode material. The modification method comprises the following steps: stirring and mixing a carbon quantum dot solution with a certain concentration and silicon powder, and reacting for 1-24 hours at the temperature of 20-180 DEG C; and centrifugally separating the reacted turbid liquid to obtain a precipitate, and drying to obtain the carbon quantum dot coated silicon negative electrode material. The modification method disclosed by the invention has the advantages of short period, low energy consumption, environmental friendliness and the like, and the modified silicon negative electrode material coated with the carbon quantum dots is greatly improved in the aspects of specific capacity, first coulombic efficiency and cycling stability, and is suitable for a high-energy-density lithium ion battery. 本发明属于锂离子电池技术领域，具体为一种硅负极材料的表面改性方法。本发明的改性方法是：将一定浓度的碳量子点溶液与