A method for preparing graphene in batches and its production system

Abstract

The invention relates to the field of graphene materials, and discloses a batch preparation method of graphene and a production system therefor. In the invention, a conventional high temperature expansion method is combined with a graphite expansion furnace, and by means of optimum expansion temperature, stability of a product is effectively improved by means of control on raw materials and process parameters on the basis of the expansion temperature, thereby producing expanded graphite with controllable expansion times, namely, distribution ratio with expansion times being 200-300 is highest. With the expanded graphite as a raw material for producing graphene through a mechanical stripping method, stripping rate of graphene is greatly increased. On the basis of the conventional mechanical stripping method for preparing graphene, the graphene is produced in batches with the expandable graphite as raw material and graphene quantum dots as a stripping liquid, wherein a pre-stripping process is added on the basis of the prior art, and secondary ultrasonic treatment is employed with process parameters in the ultrasonic treatment being optimized.

Description

Technical field [0001] The invention relates to the field of graphene materials, and more specifically, to a method for preparing graphene in batches and a production system thereof. Background technique [0002] Graphene is a two-dimensional planar single-layer structure of carbon formed by sp2 hybridized carbon atoms in the form of a hexagonal lattice, which is an allotrope of carbon. Graphene is the basic unit for constructing other dimensional carbon materials. When it is changed by wrapping, winding and stacking, it can form zero-dimensional fullerene, one-dimensional carbon nanotubes and three-dimensional graphite, respectively. Graphene has good electrical and optical properties, mechanical properties, thermal conductivity and extremely high charge carrier mobility, as well as excellent mechanical strength and flexibility. These properties of graphene have attracted a lot of attention and quickly become a research hotspot. Graphene and its derivatives treated by chemical...

AI Technical Summary

Problems solved by technology

However, none of the above methods can be used to prepare defect-free high-quality graphene in large quantities.

For example, although the mechanical exfoliation method can theoretically produce defect-free high-quality graphene, the yield of the resulting graphene is very limited

Although the vapor deposition method can be used to prepare large-area graphene, its production process is complicated, the preparation conditions are harsh, the production cost is high, and the separation and transfer process of graphene film is very difficult, so this method still has great potential. limitation

[0003] Although the redox method can realize the large-scale industrial production of graphene, the obtained graphene has compositional and structural defects, which greatly affect the various properties of graphene, which makes its development in the application field slow.

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