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Method for preparing multi-layer graphene

A multi-layer graphene and expanded graphite technology, applied in the field of carbon materials, can solve the problems of single-layer graphene with many structural defects, unsuitable for large-scale production, complex process conditions, etc., and achieves easy popularization and application, high electromagnetic wave absorption, simple craftsmanship

Active Publication Date: 2010-06-23
FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main disadvantages of this method are: the process is complicated, the catalyst needs to be specially removed, the energy consumption is large, and the production cost is too high
The main disadvantages of this method are: complex process conditions, high production costs, large energy consumption, and many structural defects in the obtained single-layer graphene, which requires special catalyst removal, which is not suitable for large-scale production.

Method used

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  • Method for preparing multi-layer graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The concrete steps of a kind of multilayer graphene preparation method are as follows:

[0024] (1) Ultrasonic vibration dispersion

[0025] According to the mass (g) of expanded graphite: the volume (ml) ratio of dehydrated alcohol solvent is the ratio of 1: 20, the expanded graphite is put into dehydrated alcohol solvent, after stirring evenly, under the ultrasonic output frequency is 100kHz, carries out Ultrasonic dispersion for 60 minutes to obtain a suspension dispersed in expanded graphite;

[0026] (2) Solid-liquid separation

[0027] After the step (1) is completed, the suspension prepared in the step (1) is subjected to solid-liquid separation by filtration, the solvent and the solid residue are collected respectively, and the collected absolute ethanol solvent is recovered and reused;

[0028] (3) dry

[0029] After step (1) is completed, the solid residue collected in (2) is dried at a temperature of 120° C. for 120 minutes to prepare multilayer graphene; ...

Embodiment 2

[0031] The concrete steps of a kind of multilayer graphene preparation method are as follows:

[0032] (1) Ultrasonic vibration dispersion

[0033] With embodiment 1, wherein: the mass (g) of expanded graphite: the volume (ml) ratio of acetone solvent is 1: 50, and ultrasonic frequency is 50Hz, and ultrasonic separation time is 100 minutes;

[0034] (2) Solid-liquid separation

[0035] With embodiment 1, wherein: adopt centrifugation to carry out solid-liquid separation by the suspension liquid that (1) step makes in centrifuge;

[0036] (3) dry

[0037] Same as Example 1, wherein: drying at a temperature of 80° C. for 30 minutes;

Embodiment 3

[0039] The concrete steps of a kind of multilayer graphene preparation method are as follows:

[0040] (1) Ultrasonic vibration dispersion

[0041] With embodiment 1, wherein: the mass (g) of expanded graphite: the volume ratio of toluene solvent is 1: 1, and ultrasonic frequency is 500kHz, and ultrasonic separation time is 30 minutes;

[0042] (2) Solid-liquid separation

[0043] With embodiment 1;

[0044] (3) dry

[0045] Same as implementation 1, wherein: drying at a temperature of 100°C for 60 minutes;

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Abstract

The invention relates to a method for preparing multi-layer graphene, and belongs to the technical field of carbon materials. The multi-layer graphene is prepared from expanded graphite serving as a raw material through ultrasonic dispersion, solid-liquid separation and drying. The thickness of the multi-layer graphene prepared by the method is between 1 and 10nm; the number of layers is between 2 and 20 layers; and the aperture is mainly between 6 and 50nm. The multi-layer graphene has the characteristics of high electrical conductivity, high heat conductivity, high electromagnetic wave absorptivity, wear resistance and the like. The method has the advantages of simpleness, convenient operation and low production cost, capability of reducing production energy consumption, no three wastes emission, environmental friendliness and convenient popularization and application. The multi-layer graphene prepared by the method can be used as the electrode materials of batteries and super capacitors, can also be used as the conductive agents of high molecular materials, ceramic materials, silicate materials and the like, and can also be used as the conductive agents of lithium batteries, alkaline batteries and nickel-metal hydride batteries.

Description

technical field [0001] The invention belongs to the technical field of carbon materials, and in particular relates to a preparation method of a multilayer graphene material. Background technique [0002] Graphene refers to graphite with a C atomic layer thickness, and C-C is composed of sp 2 Covalent linkages are in the form of hexagonal network layers, which are considered to be the basic structural units of fullerenes, carbon nanotubes, and graphite. Graphene can be decomposed into zero-dimensional fullerenes, curled to form one-dimensional carbon nanotubes, and superposed to form three-dimensional graphite. The single-layer graphene carbon atomic layer is until 2004. Geim, a professor of physics at the University of Manchester in the United Kingdom, used a very simple method to peel off and observe a single-layer graphene crystal. The study found that it has special electrical properties. In the development of new Electronic devices have great potential. [0003] Graph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 李新禄杜坤黄佳木张育新
Owner FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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