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A kind of preparation method of graphene

A graphene and graphite flake technology, applied in the field of graphene, can solve the problems of difficulty in mass preparation, small amount of graphene products, and high manufacturing cost, and achieves reduction of potential safety hazards and environmental pollution, small environmental pollution, and reduced difficulty. Effect

Active Publication Date: 2017-01-25
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of assembling electrodes into batteries, the manufacturing cost is high, and due to the control of electrode coating thickness, the amount of graphene products obtained is small, and it is difficult to achieve industrialized mass production; at the same time, graphene sheets with two-dimensional structure , it is easy to stack again after peeling off, so it is difficult to obtain a product with a small number of layers when preparing graphene by this method
[0006] In view of this, it is necessary to develop a new graphene preparation method to solve the safety hazards and environmental pollution problems in the preparation process, and at the same time realize the large-scale, low-cost, and industrialized preparation of graphene with a small number of sheets.

Method used

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  • A kind of preparation method of graphene

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Experimental program
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Effect test

Embodiment 1

[0035] Preparation of reaction slurry: natural graphite is selected as the source of graphite flakes, and its mass accounts for 95% of the mass of reaction slurry;

[0036] Propylene carbonate: a mixed solution of dimethyl carbonate=1:1 as a solvent, a solution of 1mol / L lithium hexafluorophosphate as a solute as an electrolyte (reaction solution), and its mass accounts for 3% of the mass of the reaction slurry;

[0037] Select polyvinylpyrrolidone as the surfactant, and its quality accounts for 1% of the reaction slurry quality;

[0038] Lithium metal powder is the power source material, and its quality accounts for 1% of the reaction slurry quality;

[0039] After that, it is added into the reactor, fully stirred and mixed to obtain a reaction slurry.

[0040] Preparation of graphene puree: control the temperature of the reactor at 150°C, and stir fully for 1 hour, so that the natural graphite particles and the lithium metal powder are in full contact (forming an electronic...

Embodiment 2

[0043] Different from Embodiment 1, this embodiment includes the following steps:

[0044] Preparation of reaction slurry: natural graphite is selected as the source of graphite flakes, and its mass accounts for 50% of the mass of reaction slurry;

[0045] Propylene carbonate: diethyl carbonate = 1:1 mixed solution as solvent, 1.2mol / L lithium hexafluorophosphate as solute solution as electrolyte (reaction solution), its mass accounts for 10% of the reaction slurry mass;

[0046] Select phosphoric acid ester as surfactant, its quality accounts for 30% of reaction slurry quality;

[0047] Lithium metal powder is the power source material, and its quality accounts for 10% of the reaction slurry quality;

[0048] After that, it is added into the reactor, fully stirred and mixed to obtain a reaction slurry.

[0049] Preparation of graphene puree: control the temperature of the reactor at 60°C, and fully stir for 30 minutes, so that the natural graphite particles and the lithium ...

Embodiment 3

[0052] Different from Embodiment 1, this embodiment includes the following steps:

[0053] Preparation of reaction slurry: select natural graphite as the source of graphite flakes, and its mass accounts for 20% of the mass of reaction slurry;

[0054] Propylene carbonate: a mixture of diethyl carbonate=1:1 as a solvent and a solution of 1.2mol / L lithium hexafluorophosphate as a solute as an electrolyte (reaction solution), whose mass accounts for 15% of the mass of the reaction slurry;

[0055] Select liquid paraffin to be tensio-active agent, its quality accounts for 10% of reaction slurry quality

[0056] Lithium metal powder is the power source material, and its quality accounts for 55% of the reaction slurry quality;

[0057] After that, it is added into the reactor, fully stirred and mixed to obtain a reaction slurry.

[0058] Preparation of graphene puree: control the temperature of the reactor at 60°C, and fully stir for 30 minutes, so that the natural graphite partic...

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Abstract

The invention belongs to the technical field of graphene preparation, and particularly relates to a preparation method of graphene. The preparation method comprises the following steps: adding a carbon material containing a graphite sheet structure, a reaction solution containing a graphite intercalation or / and peeling function components, a surface active agent and a power source substance into a reactor, and uniformly mixing to obtain reaction slurry; then performing peeling reaction to prepare graphene slurry, wherein in the peeling process of graphite sheets, the surface active agent can quickly wrap the peeled graphite sheets to prevent the graphite sheets from being re-stacked; finally, performing separation and purification to obtain a graphene product. Compared with the prior art, the preparation method has the advantages that when the graphene is prepared by using the method, the problems of potential safety hazard and environmental pollution in the process of preparing the graphene through an oxidation-reduction method can be solved; meanwhile, the graphene with small sheet number can be prepared in a large-batch, low-cost and industrial manner.

Description

technical field [0001] The invention belongs to the technical field of graphene, in particular to a preparation method of graphene. Background technique [0002] In 2004, Andre K. Geim of the University of Manchester in the United Kingdom prepared graphene for the first time by mechanical exfoliation, which opened the prelude to the preparation and application of this material. The so-called graphene refers to a sheet-like body in which carbon atoms are arranged in a hexagonal ring, usually consisting of a single layer or multiple layers of graphite sheets, which can be infinitely extended in a two-dimensional space. Structural materials. It has outstanding advantages such as large specific surface area, excellent electrical and thermal conductivity, and low thermal expansion coefficient: specifically, high specific surface area (theoretical calculation value: 2630m 2 / g); high conductivity, carrier transport rate (200000cm 2 / V·s); high thermal conductivity (5000W / mK); h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04
Inventor 杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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