Method and device for continuously producing graphene on large scale and graphene prepared through method

Abstract

The invention provides a method and device for continuously producing graphene on a large scale and the graphene prepared through the method. The method comprises the following steps of a) carrying out full wetting, specifically, mixing the graphite with a solvent, and carrying out low-speed stirring treatment and / or low-speed shearing treatment at least once so as to obtain graphite dispersion liquid; b) carrying out preliminary stripping, specifically, carrying out sanding treatment on the graphite dispersion liquid obtained in the step a) at least once so as to obtain graphene dispersion liquid subjected to preliminary stripping; and c) carrying out secondary stripping, specifically, carrying out high-pressure homogenization treatment and / or ultrasonic treatment on the graphene dispersion liquid subjected to preliminary stripping obtained in the step b) at least once so as to obtain single-layer or few-layer graphene dispersion liquid. The method has the advantages that the high-quality graphene can be further obtained on the premise of environmental protection, and the process difficulty and the cost can be lowered. The device has the advantage that the existing problem that graphene is difficult to produce on a large scale can be solved. The graphene prepared through the method has the advantages of being high in purity, thin in thickness, large in specific surface area, low in resistivity and low in metal impurity content.

Description

technical field [0001] The invention belongs to the technical field of graphene preparation, and in particular relates to a method and device for large-scale continuous production of graphene and graphene prepared by the method. Background technique [0002] In 2004, two professors from the University of Manchester successfully prepared graphene, and won the Nobel Prize in 2010 for this. Graphene is a two-dimensional material with a thickness of only one carbon atom and has excellent physical and chemical properties. For example, the specific surface area of ​​graphene is 2630m 2 / g, the thermal conductivity is as high as 5300W / m K, and its electron mobility exceeds 15000cm at room temperature 2 / V·s, the resistivity is only 10 -8 Ω·cm, the strength is as high as 1.01TPa. The superior properties of graphene make it have great application prospects. [0003] At present, the low production capacity and unstable quality of graphene in the domestic and foreign markets are c...

AI Technical Summary

Problems solved by technology

The peeling effect of the ball milling method is poor, and it is difficult to obtain graphene with a small number of layers, and most of them are graphite sheets with more than 10 layers

Recently, there is also a method of preparing graphene through a high-pressure homogenizer. However, its peeling effect is average, and it is also affected by the state and concentration of the material. The output is low, the equipment is seriously damaged, and it has no practical application value.

The above methods are difficult to achieve the purpose of batch production of high-quality graphene that is environmentally friendly, fast, efficient, and low-cost

Images