Method for preparing graphene/tin dioxide quantum dot negative electrode material of lithium ion battery

The invention relates to a method for preparing a graphene/tin dioxide quantum dot negative electrode material of a lithium ion battery. The method comprises the following steps of 1) mixing glucose and stannous chloride, and grinding the glucose and the stannous chloride in an agate mortar; 2) mixing sodium chloride and potassium chloride, and carrying out ball milling by a ball milling machine; 3) uniformly mixing the materials of the step 1) and the step 2), and carrying out pre-heating processing; 4) placing the mixed material after pre-heated in a square ceramic boat, placing the ceramic boat in a tubular furnace, introducing an inertia gas for protection, and carrying out calcination; 5) carrying out heat preservation after calcination; 6) naturally reducing a temperature to a room temperature under the protection of the inertia gas, and taking out a sample; and 7) washing the obtained sample with diluted hydrochloric acid, and obtaining the material by vacuum filtration. With the adoption of one-step synthesis by solid phase reaction, the cheap glucose is taken as a carbon source, and thus, the graphene/tin dioxide quantum dot negative electrode material of the lithium ion battery is synthesized at a large scale and can be widely applied to the existing lithium ion battery.