A kind of carbon coated graphene, preparation method and application thereof

A graphene and carbon coating technology, which is applied in the manufacture of hybrid/electric double layer capacitors, electrical components, battery electrodes, etc. The effect of increased volume specific capacitance, increased energy density, and stable cycle performance

Active Publication Date: 2016-05-11
南通第六元素材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aiming at the problem that graphene has a small volume specific capacitance and cannot be applied to electrical devices such as large-capacity supercapacitors, the present invention proposes a graphene with high volume specific capacitance in order to effectively solve this problem

Method used

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  • A kind of carbon coated graphene, preparation method and application thereof
  • A kind of carbon coated graphene, preparation method and application thereof
  • A kind of carbon coated graphene, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] A preparation method of carbon-coated graphene, comprising the steps of:

[0069] (1) Pre-treatment: Take the graphite oxide prepared by the Hummers method, and obtain graphene oxide powder after microwave peeling, and set aside; weigh 1g of sucrose and dissolve it in 100mL deionized water to fully dissolve, add 3g of graphene oxide powder and stir for 5h, then add 15g of KOH, fully mixed, stirred and dried;

[0070] (2) Put the mixture obtained in step (1) in a vacuum tube furnace, and after removing the air in the furnace, pass argon gas with a purity of 99.99% into the vacuum tube furnace at a flow rate of 100 sccm, and react at 800°C for 2 hours ;

[0071] (3) After the reaction is completed, the temperature is naturally cooled to room temperature, washed, and dried to obtain a carbon-coated graphene material with increased volume specific capacitance. figure 1 It is the SEM figure of carbon-coated graphene described in embodiment 1;

[0072] The specific surface...

Embodiment 2

[0078] A preparation method of carbon-coated graphene, comprising the steps of:

[0079] (1) Pretreatment: Take the graphite oxide prepared by the Hummers method, and obtain graphene oxide powder after microwave peeling, and set aside; weigh 2g of glucose and dissolve it in 100mL deionized water to fully dissolve, add 3g of graphene oxide powder and stir for 10h, then add 18g of KOH, fully mixed, stirred and dried;

[0080] (2) Place the mixture obtained in step (1) in a vacuum tube furnace, and after removing the air in the furnace, pass argon gas with a purity of 99.99% into the vacuum tube furnace at a flow rate of 100 sccm, and react at 900°C for 1 hour ;

[0081] (3) After the reaction is completed, the temperature is naturally cooled to room temperature, washed, and dried to obtain a carbon-coated graphene material with increased volume specific capacitance.

[0082] The specific surface area of ​​the prepared graphene material is 2590m 2 / g (measurement method is the...

Embodiment 3

[0086] A preparation method of carbon-coated graphene, comprising the steps of:

[0087] (1) Pretreatment: Take the graphite oxide prepared by the Hummers method, and obtain graphene oxide powder after microwave peeling, and set aside; weigh 0.5g fructose and dissolve it in 100mL deionized water to fully dissolve, add 3g graphene oxide powder and stir for 15h, then Add 12g of KOH, fully mix, stir and dry;

[0088](2) Place the mixture obtained in step (1) in a vacuum tube furnace. After removing the air in the furnace, feed argon gas with a purity of 99.99% into the vacuum tube furnace at a flow rate of 100 sccm, and react at 1000°C for 1.5 h;

[0089] (3) After the reaction is completed, the temperature is naturally cooled to room temperature, washed, and dried to obtain a carbon-coated graphene material with increased volume specific capacitance.

[0090] The specific surface area of ​​the prepared graphene material is 2995m 2 / g (measurement method is the same as Example...

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Abstract

The invention relates to a preparation method for carbon-coated graphene. The preparation method includes the steps that after carbohydrates are fully mixed with oxidized graphene, an activating agent is added, the mixture is activated after being dried, and then the carbon-coated graphene is acquired. The sum of height specific surface areas of graphene materials is guaranteed, the density of the graphene is improved, then volume specific capacitance of the graphene is improved, and the technical problems that the graphene can not be used as an electrode material and applied to a super-capacitor due to small volume specific capacitance are solved. The carbon-coated graphene, the preparation method of the carbon-coated graphene and application of the carbon-coated graphene are simple in operation, low in cost, safe, reliable, small in pollution, high in production efficiency, low in cost, high in market competitiveness, wide in application prospect, and capable of being massively produced.

Description

technical field [0001] The invention belongs to the field of preparation and application of graphene materials, and relates to a carbon-coated graphene, a preparation method and its application. The preparation method of the carbon-coated graphene is that a sugar substance is dissolved and uniformly coated on graphite A method for preparing graphene with high specific surface area, high mass specific capacitance and high volume specific capacitance on the surface of graphene. Background technique [0002] Graphene is a two-dimensional lattice structure in which carbon atoms are arranged in a hexagonal manner. Since it was discovered by scientists from the University of Manchester in 2004, its excellent performance in mechanics, heat, electricity, optics, etc. has become the focus of scientific and industrial circles, especially in the field of energy research. Graphene has a large specific surface area, excellent electrical conductivity, high electron mobility, low thermal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/34H01G11/42H01G11/86H01M4/133H01M4/1393
CPCY02E60/10Y02E60/13
Inventor 李璐徐怀良刘琼馨瞿研
Owner 南通第六元素材料科技有限公司
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