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Preparation method of graphene and graphene prepared by same

A technology of graphene and graphite, which is applied in the field of graphene, can solve the problems of limiting the application of graphene, low cost, stable and controllable product performance, etc.

Inactive Publication Date: 2012-10-03
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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  • Preparation method of graphene and graphene prepared by same
  • Preparation method of graphene and graphene prepared by same
  • Preparation method of graphene and graphene prepared by same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Preparation of Graphite Interlayer Compounds by Battery Discharge Method

[0068] 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 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, select a metal lithium sheet As the negative electrode of the battery, the graphite electrode as the positive electrode of the battery, a solution in which lithium hexafluorophosphate is dissolved in a ternary mixed solvent of EC / EMC / DMC (ethylene carbonate / ethyl methyl carbonate / dimethyl carbonate) wi...

Embodiment 2

[0075] Preparation of Graphite Interlayer Compounds by Battery Discharge Method

[0076] 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

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

[0079] 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 preparation method of graphene and graphene prepared by the method, and is characterized in that the method adopts graphite as a raw material; a graphite intercalation compound is prepared by intercalating metal between graphite layers; and then graphene is prepared by peeling the graphite intercalation compound. The graphene prepared by the method has a length and a width of 5-15000 nm, and a thickness of 0.3-15 nm. The advantages of the invention are that: the raw material source is wide; the cost is low; the preparation method is simple; the product performance is stable and controllable; and the method is suitable for industrial 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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IPC IPC(8): C01B31/04C01B31/00C01B32/19
Inventor 关士友崔佳佳周敏王丽侠刘婷婷
Owner EAST CHINA UNIV OF SCI & TECH
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