Graphene preparation method, and graphene prepared through using method

A technology of graphene and graphite, applied in the field of graphene, can solve the problems of low cost, stable and controllable product performance, and simple preparation method of graphene

Inactive Publication Date: 2012-12-12
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] To sum up, the current technology for preparing graphene cannot meet the basic requirements of industrialization such as simple preparation method, low cost, stable and controllable product performance, which greatly limits the application of graphene in a wider and wider field.

Method used

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  • Graphene preparation method, and graphene prepared through using method
  • Graphene preparation method, and graphene prepared through using method
  • Graphene preparation method, and graphene prepared through using method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Preparation of Graphite Interlayer Compounds by Battery Discharge Method

[0071] Special spherical graphite SSG (active material) (obtained from Hunan Loudi Huiyu Technology Co., Ltd.), acetylene black (conductive agent, particle size: about 10nm), polyvinylidene fluoride PVDF (binder) in a mass ratio of 8:1 Mix in a ratio of 1:1, add 1-methyl-2-pyrrolidone (NMP) to make the PVDF concentration in the range of 0.005-0.03g / ml, stir well, and adjust to a paste slurry. Spread it evenly on the copper foil. After the solvent is completely volatilized, use a puncher to make a circular graphite electrode sheet. After vacuum drying the prepared graphite electrode sheet at 80°C for 12 hours, use a metal lithium sheet as a The negative electrode of the battery, the graphite electrode as the positive electrode of the battery, the solution in which lithium hexafluorophosphate is dissolved in a ternary mixed solvent of EC / EMC / DMC (ethylene carbonate / ethyl methyl carbonate / dimethyl c...

Embodiment 2

[0078] Preparation of Graphite Interlayer Compounds by Battery Discharge Method

[0079] Except that the pulse discharge time was 3 days, other operations were the same as in Example 1, so as to obtain a second-order lithium-graphite intercalation compound. The yield of the final graphene obtained is 0.59%, the thickness of the obtained graphene is between 2.1 and 9.2, that is, the number of layers is between about 5 and 26 layers, the length and width are between 100 and 6300 nm, and the D peak in the Raman spectrum and the intensity ratio of G peak to I D / I G The value is 0.68.

Embodiment 3

[0081] Preparation of Graphite Interlayer Compounds by Battery Discharge Method

[0082] Except that the pulse discharge time was 2 days, other operations were the same as in Example 1, so as to obtain a third-order lithium-graphite intercalation compound. The yield of the final graphene obtained is 0.45%, the thickness of the obtained graphene is between 4.5 and 11.3, that is, the number of layers is between about 12 and 32 layers, the length and width are between 130 and 7000 nm, and the D peak in the Raman spectrum and the intensity ratio of G peak to I D / I G The value is 0.67.

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Abstract

The invention relates to a graphene preparation method, and graphene prepared through using the method. The preparation method is characterized in that a metal is intercalated into layers of graphite which is a raw material to prepare a graphite intercalation compound, and the graphite intercalation compound is peeled to prepare the graphene. The length, the width and the thickness of the graphene prepared through using the method are 5-15000nm, 5-15000nm and 0.3-15nm respectively. The method has the advantages of wide raw material source, low cost, simplicity, stable controllability of the graphene performances, and suitableness for industrialized production.

Description

【Technical field】 [0001] The invention relates to the technical field of graphene, in particular, the invention relates to a method for preparing graphene and graphene prepared by using the method. 【Background technique】 [0002] Graphene is a newly recognized allotrope of carbon after fullerene and carbon nanotubes. Graphene is a carbon atom with sp 2 A carbon material with a single-layer two-dimensional honeycomb lattice structure formed by hybrid orbital bonding and a six-membered ring structure. This unique structure of graphene brings it a series of novel and special properties, such as colorless and transparent (absorbed light intensity is only 2.3%), high conductivity (single-layer graphene conductivity is similar to that of copper), Excellent mechanical properties (tensile strength can reach 50-200GPa, elastic modulus can reach 1TPa, and the tensile strength of single-layer graphene is 100 times that of steel sheets of the same thickness). The above characteristic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04B82Y40/00C01B32/19
Inventor 关士友崔佳佳王丽侠刘婷婷周敏
Owner EAST CHINA UNIV OF SCI & TECH
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