Device for preparing graphene by dry grinding and stripping with and method for production graphene

Abstract

The invention belongs to the technical field of graphene and provides a device for preparing the graphene by dry grinding and stripping. The device is characterized by comprising a driving unit, a disc rolling unit, a serial disc extruder, a cyclone disperser and a product collector, the disc rolling unit is provided with a grinding disc and a grinding roller, and the serial disc extruder is provided with a fixed disc and a moving disc which are combined dynamically and statically. The primary graphene is prepared by gradual shearing and striping with the disc rolling unit, and the graphene product is obtained by further shearing and stripping with the serial disc extruder. The graphene is prepared by continuous and stable stripping under the dry condition, production efficiency is high, and large-scale production of the graphene is easily realized.

Description

technical field [0001] The invention belongs to the technical field of graphene, and in particular relates to a device for preparing graphene by dry grinding and stripping and a method for producing graphene. Background technique [0002] In 2004, two scientists from the University of Manchester in the United Kingdom discovered graphene using the method of micromechanical exfoliation, and won the Nobel Prize in Physics in 2010. Graphene is currently the thinnest and hardest nanomaterial. It also has properties that many ordinary materials do not possess, such as good light transmission, high thermal conductivity, high electron mobility, low resistivity, and high mechanical strength. This special property makes Graphene has great application value in many fields such as touch screen, sensor, super capacitor, lithium battery, fast charging, solar battery, hydrogen storage, heat dissipation of electronic components, material reinforcement, anti-corrosion coating, biomedicine, s...

AI Technical Summary

Problems solved by technology

In practice, although graphene is obtained through repeated mechanical grinding, due to the effect of grinding compressive stress, the grinding impact will cause certain damage to the graphite lattice, and due to the pressure exerted on graphite by grinding, it will cause huge damage to the exfoliated graphite. Impact force, this impact force will cause structural defects in the graphene layer, which can easily cause lattice defects in the graphene layer structure, reduce the size of the graphene after stripping, and make the obtained graphene product crystal size small

In addition, the current grinding and production of graphene is intermittent. While exfoliating graphite, the exfoliated graphene cannot be screened out in time, so it is difficult to carry out continuous and stable mass production. At the same time, the conventional grinding and exfoliating method mainly refers to graphite Grinding in the grinder, the friction force generated by the pressure will shear the graphite, which will easily cause structural defects in the graphene and reduce the size of the graphene after peeling, so that the edge of the obtained product will have "burrs" and the crystal size is small. The application of its graphene is limited, unable to develop large-scale production and its application

[0005] In summary, the current mechanical exfoliation preparation is easy to cause lattice defects on graphene, which cannot be mass-produced, and the exfoliation preparation efficiency is low and the cost is high, thus affecting the market application of graphene

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