Method and device for massively producing graphene conductive slurry and prepared graphene conductive slurry

Abstract

The invention provides a method and a device for massively producing a graphene conductive slurry and a prepared graphene conductive slurry. The method comprises the following steps of a) mixing graphite and a solvent, carrying out at least one low-speed mixing processing or / and low-speed shearing processing and acquiring a graphite dispersion liquid; b) carrying out at least one sanding processing on the graphite dispersion liquid and acquiring a preliminary stripped graphene dispersion liquid; c) carrying out at least one high pressure homogenization processing or / and ultrasonic processing on the preliminary stripped graphene dispersion liquid, and acquiring a single layer or a small layer of graphene dispersion liquid; d) dissolving a dispersing agent in a solvent to obtain a dispersantsolution; and e) mixing the single layer or the small layer of graphene dispersion liquid and the dispersant solution, carrying out at least one sanding processing, and acquiring the graphene conductive slurry. By using the method, under the condition of environmental protection, the stable and uniformly-dispersed graphene conductive slurry with a high concentration is acquired. And the device issuitable for the continuous automatic production of the high-concentration and high-stability graphene conductive slurry.

Description

technical field [0001] The invention belongs to the technical field of preparation of graphene conductive paste, and in particular relates to a large-scale continuous production of graphene conductive paste, a device and a graphene conductive paste 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, graphene is most widely used in the field of lithium batte...

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Problems solved by technology

[0004] Although there are patents for the preparation of graphene conductive paste directly by mechanical exfoliation, the key steps in the preparation of the paste are only ball milling and sand milling for exfoliation, and it is difficult to achieve the optimal exfoliation effect. The thickness of the final product is as high as Dozens of layers, it can only be considered as a thinner graphite sheet, not real graphene, and the conductive paste is not real graphene conductive paste

[0005] In the actual application of graphene conductive paste, people often mix additives such as conductive carbon black powder into the paste again. However, due to the lack of special mixing equipment and the high viscosity of the original conductive paste during the re-mixing process, it often causes Uneven powder mixing will have an uncertain impact on the performance of subsequent products

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