Graphene grinding and stripping device, graphene production system and production method

Abstract

The invention discloses a graphene grinding and stripping device which comprises an upper grinding disc, a lower grinding disc, a driving mechanism for driving the upper grinding disc to rotate, and a material collection mechanism for collecting a product after grinding, wherein the upper grinding disc and the lower grinding disc are matched with each other; a horizontal contact surface is formed between the upper grinding disc and the lower grinding disc, the upper grinding disc is provided with an upper feed inlet, the lower grinding disc is provided with a lower feed inlet, the upper feed inlet and the lower feed inlet are both connected with the contact surface between the upper grinding disc and the lower grinding disc, and the lower end of the lower feed inlet is in sealed connection with one water inlet tube; moreover, the upper end face of the lower grinding disc is provided with a groove, and an annular region formed by rotary surrounding of the lower end of the upper feed inlet is surrounded in the groove. The graphene grinding and stripping device can realize large-size successful stripping of graphene. The invention also relates to a graphene production system containing the graphene grinding and stripping device and a graphene production method.

Description

technical field [0001] The invention relates to the technical field of graphene production, in particular to a graphene grinding and stripping device and a graphene production system, and also to a graphene production method. Background technique [0002] Graphene is a sheet-like two-dimensional material in which carbon atoms are represented by sp 2 The hybrid orbitals form a hexagonal honeycomb lattice structure. This special two-dimensional structure causes graphene to exhibit various special properties, such as high strength, high hardness, high thermal conductivity and electrical conductivity; due to these structural characteristics and performance characteristics, graphene is known as the Layers, transparent bendable electronic components, ultra-large capacitors, etc. are the most promising potential materials. What needs to be added is that, strictly speaking, graphene is a single-layer sheet; however, due to the difficulty of preparing single-layer graphene, oligola...

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Problems solved by technology

[0005] Among them, conventional grinding refers to grinding graphite in a mortar grinder. The disadvantages are: first, the shear force comes from the friction force caused by pressure, and the excessive pressure makes it difficult for the motor to drive the pestle body to rotate, which limits the shear force. If the pressure is too small, it is difficult to shear and peel off; secondly, the shearing efficiency is low, and increasing the amount of pressed powder will lead to insufficient shearing force of some powders; thirdly, the uneven pressure exerted by the pestle on the graphite is prone to overgrinding, and the Applying pressure to graphite will cause structural defects in graphene, and even shatter graphene after exfoliation, so that the obtained product has more "burrs" on the edges and small crystal size

[0010] During the research process, the inventors found that the main reason for the small size of the graphene obtained by the existing graphene peeling device is that the graphite is sheared in an unoriented direction, wherein the graphite layer is not parallel to the shear plane When it is sheared in the same way, the result tends to be that graphite is not sheared to exfoliate graphene, but graphite or graphene is crushed into smaller sizes

In addition, the reason for graphene fragmentation is that graphene is subjected to high-speed grinding during the stripping process, and the rotation speed reaches 2000rpm / min or even 12000rpm / min. High temperature and high heat generated by high-speed operation will oxidize graphene, and graphene will produce defects or even fragmentation. , which in turn affects the quality of the exfoliated graphene

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