A preparation method of a mixture of nano-silicon particles and graphene lithium battery negative electrode materials coated with a silicon monoxide network structure

Abstract

The invention provides a method for preparing a mixture of coated silicon monoxide network structure nano-silicon particles and graphene lithium battery negative electrode material, comprising the following steps: (1) mixing silicon compound and graphene to prepare a soluble mixture solution; (2) ) The silicon compound and graphene in the soluble mixture solution are both made into nanoparticles, and then added into the chamber of the microwave pyrolysis equipment; (3) The oxygen partial pressure in the chamber is controlled at 5~10000ppm, and the temperature is 200~500℃ , after reacting for 10-300s, collect the powder in the microwave pyrolysis chamber and dry to obtain the product. The method not only has simple process, but also has good dispersion and high purity of nano-silicon particles and graphene particles in the obtained mixture of nano-silicon particles coated with silicon monoxide network structure and graphene lithium battery negative electrode material.

Description

technical field [0001] The invention relates to the production field of battery electrode materials, in particular to a method for preparing a mixture of nano-silicon particles coated with a silicon monoxide network structure and a graphene lithium battery negative electrode material. Background technique [0002] With the depletion of non-renewable energy sources such as fossil fuels, people are increasingly demanding new types of renewable clean energy and energy storage and conversion technologies. Lithium-ion batteries have the advantages of high energy density, long cycle life, and no memory effect. They have been widely used in portable electronic devices such as mobile phones and notebook computers, and are expected to be used in electric vehicles, new energy storage and other fields. However, the theoretical specific capacity of commercially applied graphite-based carbon anode materials is only 372mAh / g, which limits the further improvement of the energy density of l...

AI Technical Summary

Problems solved by technology

Although this method can improve the cycle stability of silicon anode materials to a certain extent, this method also has many disadvantages: (1) when silicon is pulverized by ball milling, impurities are easily mixed into the solution, which affects the purity of nanoparticles; (2) Hydrogen treatment is easy to cause uneven reduction due to powder coalescence; (3) Hydrofluoric acid solution is easy to cause injury to operators, and acid discharge will cause environmental pollution; (4) Due to the nano Aggregation will occur between silicon particles, therefore, in the process of mixing the solution containing nano-silicon particles coated with silicon monoxide network structure and the graphene solution, it is impossible to ensure that the nano-silicon particles coated with silicon monoxide network structure and graphite Uniform distribution of ene particles; (5) complex process