Layered graphene and preparation method thereof

A technology of layered graphite and crystalline graphite, applied in the field of graphene, can solve the problems of simple preparation process and few layers, and achieve the effects of high conductivity, small particle size and stable properties

Inactive Publication Date: 2020-08-18
SHENZHEN EUBO NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of layered graphene and its preparation method, aiming at solving the problem that the preparation technology of graphene in the prior art is difficult to obtain layered graphene with high quality, fewer layers and simple preparation process question

Method used

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  • Layered graphene and preparation method thereof

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preparation example Construction

[0020] The embodiment of the present invention provides a preparation method of layered graphene. The method comprises the steps of:

[0021] S01. Provide crystalline graphite, and perform the first mixing treatment with the crystalline graphite, the reaction solution and the dispersant to obtain the first mixture;

[0022] S02. Performing a second mixing treatment on the first mixture and an activator to obtain a second mixture; post-processing the second mixture to obtain layered graphene;

[0023] Wherein, the reaction liquid is selected from at least one of chlorosulfonic acid, perchloric acid, and sodium perchlorate, and the activator is selected from at least one of hydrogen peroxide, sodium bicarbonate, and sodium peroxide.

[0024] The preparation method of layered graphene in the embodiment of the present invention, the preparation method is to use crystalline graphite as a raw material, and add at least one of chlorosulfonic acid, perchloric acid, and sodium perchlo...

Embodiment 1

[0051] Layered graphene and its preparation method

[0052] The preparation method comprises the steps of: providing large flake crystalline graphite, mixing the crystalline graphite with chlorosulfonic acid solution (reaction solution) and sodium lauryl sulfate (dispersant), and stirring and mixing for 10 hours with a mechanical stirrer to obtain The first mixture; wherein, the weight ratio of crystalline graphite, reaction liquid and dispersant is 1:50:0.01;

[0053] Stir the first mixture with hydrogen peroxide (activator) with a volume concentration of 50%, wherein the weight ratio of crystalline graphite to the activator is 1:50; and continue to stir rapidly for 30 minutes to obtain the second mixture, add distilled water to mix and Filtration is carried out to obtain aggregates, wherein the weight ratio of the second mixture to distilled water is 1:500; the aggregates are dispersed in distilled water and ultrasonicated for 40 minutes, and the dispersion is freeze-dried t...

Embodiment 2

[0055] Layered graphene and its preparation method

[0056] The preparation method comprises the following steps: providing large scale crystalline graphite, mixing the crystalline graphite with perchloric acid (reaction solution) and polyethylene glycol (dispersant), and stirring and mixing for 20 hours with a mechanical stirrer to obtain the first mixture ; Wherein, the weight ratio of crystalline graphite, reaction liquid and dispersant is 1:150:0.01;

[0057] Stir the first mixture with sodium bicarbonate powder (activator), wherein the weight ratio of crystalline graphite to activator is 1:100; and continue to stir rapidly for 50 minutes to obtain the second mixture, add distilled water to mix and filter Agglomerates are obtained, wherein the weight ratio of the second mixture to distilled water is 1:1000; the agglomerates are dispersed in an ethanol solution and ultrasonicated for 30 minutes to obtain a layered graphene dispersion. Wherein, the layered graphene is a lay...

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Abstract

The invention provides a preparation method of layered graphene. The preparation method comprises the following steps: providing crystalline graphite, and carrying out first mixing treatment on the crystalline graphite, a reaction solution and a dispersing agent to obtain a first mixture; carrying out second mixing treatment on the first mixture and an activating agent to obtain a second mixture,and carrying out post-treatment to obtain the layered graphene, wherein the reaction liquid is selected from at least one of chlorosulfonic acid, perchloric acid and sodium perchlorate, and the activating agent is selected from at least one of hydrogen peroxide, sodium bicarbonate and sodium peroxide. According to the preparation method, an activating agent and reaction liquid uniformly dispersedin crystalline graphite are subjected to a violent reaction; a large amount of gas is instantly generated in crystalline graphite, the internal space of the crystalline graphite is expanded and expanded by the large amount of gas, the effect of physical vapor phase stripping is achieved, the crystalline graphite is stripped in a vapor phase environment, and the layered graphene is prepared.

Description

technical field [0001] The invention relates to the field of graphene, in particular to a layered graphene and a preparation method thereof. Background technique [0002] Green new energy and energy-saving technology is the fundamental guarantee for solving energy and environmental problems. Therefore, in the "National Medium and Long-term Science and Technology Development Program (2006-2020)" issued by the State Council, it is clearly proposed to vigorously develop high-efficiency secondary batteries and supercapacitors. High-efficiency energy conversion and energy storage materials and their preparation technologies, represented by fuel cells and fuel cells, are listed as one of the important frontier technologies in the field of new material technology. For the new "green" energy storage device, while concerned about its "green", high energy density and high power density are important indicators of whether it can truly replace the traditional energy storage and transpor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19
CPCC01B2204/04C01B2204/24C01B2204/32C01B32/19
Inventor 杨斌岳风树岳树伟李刚王虹
Owner SHENZHEN EUBO NEW MATERIAL TECH
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