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Method for preparing expanded graphite or graphene

A technology of expanded graphite and graphite, which is applied in the field of material preparation, can solve the problems of complex graphene process, long production cycle, cumbersome operation, etc., and achieve the effects of facilitating industrial production, reducing processing costs, and avoiding violent reactions

Active Publication Date: 2016-11-23
HUAQIAO UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of preparing graphene by this method is complicated, the cycle is long, and the preparation method is limited by many conditions, so it is not suitable for large-scale production
Among them, the improvement of the experiment by Changchun Institute of Applied Chemistry, Chinese Academy of Sciences (patent number: CN102627272A) can be prepared by exfoliating graphene by using a composite system of chlorosulfonic acid and hydrogen peroxide. The whole reaction is explosive, and chlorosulfonic acid meets water. A violent reaction occurs, making this method difficult to scale up for industrial production
In the Chinese patent "A method for directly preparing expanded graphite or graphene at normal temperature and pressure" (CN 105253878 A), expanded graphite or graphene is prepared by adding graphite to a joint system of concentrated sulfuric acid and oxidant ammonium persulfate, etc., but This method releases a large amount of toxic gases such as sulfur dioxide during the preparation process, and the reaction time is more than 3 hours at normal temperature and pressure.
Although this method prepares high-quality expanded graphite, the pretreatment reaction time of this method is long, and it needs a long time of heating, not only the operation is cumbersome, but also the production cycle is too long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of method for preparing expanded graphite of the present invention, realizes by following steps:

[0037] (1) 10 g of graphite and 200 g of amide percarbonate were stirred and mixed for 0.5 h at a speed of 100 rpm in an iron container to obtain a uniformly stirred solid mixture.

[0038] (2) In the Erlenmeyer flask, add 20ml of chlorosulfonic acid and 2g of the solid mixture in turn, and stir magnetically for 5 minutes. During the stirring process, the volume of the solid mixture expands rapidly, and the rotating speed of the magnetic stirring should be increased by 10%-50% accordingly. The reaction heat of the expansion part is released to the surrounding environment more quickly. After the reaction is completed, the upper layer of expanded graphite and acid solution are separated, washed and filtered with deionized water several times until neutral, and wet high-magnification expanded graphite is obtained.

Embodiment 2

[0040] A kind of method for preparing expanded graphite of the present invention, realizes by following steps:

[0041] (1) Stir and mix 10 g of graphite and 200 g of sodium perborate in an iron container at a speed of 100 rpm for 0.5 h to obtain a uniformly stirred solid mixture.

[0042] (2) In the Erlenmeyer flask, add 20ml of chlorosulfonic acid and 2g of the solid mixture in turn, and stir magnetically for 5 minutes. During the stirring process, the volume of the solid mixture expands rapidly, and the rotating speed of the magnetic stirring should be increased by 10%-50% accordingly. The reaction heat of the expansion part is released to the surrounding environment more quickly. After the reaction is completed, the upper layer of expanded graphite and acid solution are separated, washed and filtered with deionized water several times until neutral, and wet high-magnification expanded graphite is obtained.

Embodiment 3

[0044] A kind of method for preparing expanded graphite of the present invention, realizes by following steps:

[0045] (1) 10 g of graphite and 200 g of sodium percarbonate were stirred and mixed for 2 h at a speed of 50 rpm in an iron container to obtain a uniformly stirred solid mixture.

[0046] (2) In the Erlenmeyer flask, add 20ml of chlorosulfonic acid and 2g of the solid mixture in turn, and stir magnetically for 5 minutes. During the stirring process, the volume of the solid mixture expands rapidly, and the rotating speed of the magnetic stirring should be increased by 10%-50% accordingly. The reaction heat of the expansion part is released to the surrounding environment more quickly. After the reaction is completed, the upper layer of expanded graphite and acid solution are separated, washed and filtered with deionized water several times until neutral, and wet high-magnification expanded graphite is obtained.

[0047] (3) Freeze-drying the wet high-expansion graphi...

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Abstract

The invention discloses a method for preparing expanded graphite or graphene. The method comprises the following technical processes: uniformly mixing graphite with a swelling agent, and adding a preprocessed solid mixture into a proper amount of chlorosulfonic acid so as to rapidly prepare the expanded graphite and the grapheneunder normal temperature. The method for preparing the expanded graphite does not relate to any high-temperature and high-pressure process and is environmentally friendly, the operation is safe, and the cost is low. The expanded graphite prepared by virtue of the method can reach 50-1000 times of volume expansion and can maintain the integrity of a graphite flake layer structure. The expanded graphite can be widely applied to various fields of energy storage, optoelectronic devices, solar cells, anticorrosive paints and the like. The expanded graphite can be further taken as a precursor for preparing high-quality graphene basically having no defect by virtue of mechanical stripping of the expanded graphite.

Description

【Technical field】 [0001] The invention belongs to the technical field of material preparation, and more specifically relates to a method for preparing expanded graphite or graphene. 【Background technique】 [0002] Graphene, as a new type of carbon material, has attracted much attention since it was discovered in 2004; it has high light transmittance, electrical conductivity and specific surface area, and excellent mechanical properties. It is widely used in composite materials, energy materials, communications and other fields. It has broad application prospects and great commercial value. [0003] How to achieve industrial production with high efficiency, safety, low cost, and mass preparation is still an important and indispensable prerequisite for graphene application research. [0004] Among the published methods for preparing expanded graphite, Behabtu [Behabtu et al., NatNanotechnol, 2010, 5, 406] et al. proposed a new method for preparing graphene in 2010, specifical...

Claims

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Application Information

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IPC IPC(8): C01B31/04
CPCC01P2002/72C01P2002/82C01P2004/03
Inventor 陈国华刘赟杰赵立平
Owner HUAQIAO UNIVERSITY
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