Method for preparing graphene slurry

Abstract

The invention discloses a method for preparing graphene slurry. The method comprises the following steps: 1) performing high temperature expansion on the expandable graphite, then performing solid-gasseparation to obtain graphite worm, and then spreading the material and finally rolling the material into paper; 2) crushing the graphite paper obtained in step 1) to obtain graphite powder having aparticle size of 200 to 500 [mu]m; 3) crushing the graphite powder obtained in the step 2) to obtain graphite micro powder having the particle size of 5 [mu]m or less; and 4) mixing the graphite finepowder with a solvent, uniformly stirring a mixture, and then using a high-speed shearing machine for processing, and then performing ultrasonic processing to obtain the graphene slurry. The method expands high-rate expandable graphite and then rolls the graphite to paper to increase the unit volume density, and then performs subsequent preparation, and the stripping is more sufficient; by high-temperature expansion and gas separation, the exhaust gas and impurities can be removed, and the quality of the graphene slurry can be improved.

Description

technical field [0001] The invention belongs to the technical field of graphene, and in particular relates to a preparation method of graphene slurry. Background technique [0002] Graphene is a two-dimensional carbon nanomaterial in which carbon atoms form a hexagonal honeycomb lattice with sp² hybrid orbitals. Graphene slurry can be prepared by ultrasonic dispersion, sand mill and grinding disperser. [0003] The preparation method of existing commonly used graphene slurry [0004] 1. Obtain graphite oxide through a strong oxidant, obtain graphene oxide after ultrasonic vibration, and then add a reducing agent for reduction to obtain graphene. Strong oxidants are generally highly corrosive and dangerous. After the strong oxidizer oxidizes natural graphite, it is difficult to remove other non-metallic elements remaining in the graphite, and it is necessary to add a reducing agent to carry out the reduction reaction. The oxidation-reduction process of this process is gene...

AI Technical Summary

Problems solved by technology

Strong oxidants are generally highly corrosive and dangerous. After the strong oxidizer oxidizes natural graphite, it is difficult to remove other non-metallic elements remaining in the graphite, and it is necessary to add a reducing agent to carry out the reduction reaction.

The oxidation-reduction process of this process is generally more polluting, usually involving hazardous chemicals, and the process is more complicated. First, high-quality graphene oxide must be prepared, and then it must be reduced. The process is complicated, and the error and controllability are poor. The quality of graphite oxide directly affects the quality of graphene, and even determines whether graphene can be formed. Generally, the oxidation of graphite by strong oxidants will cause structural defects in graphene and affect the performance of graphene.

[0005] 2. Liquid phase exfoliation method: Add corresponding organic solvents and surfactants to flake graphite or expandable graphite, and then use ultrasonic-assisted exfoliation. The organic solvents and surfactants designed by this method have certain environmental pollution, and the subsequent treatment process The residual solvent in graphene is difficult to remove, which seriously affects the performance of graphene

Moreover, the opening between graphite layers is not sufficient, and it is difficult in the subsequent peeling process, and the peeling is not sufficient, and the number of single-layer graphene that can be obtained is small.

Images