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Method for preparing grapheme/carbon composite material

A carbon composite material and graphene technology, applied in the field of graphene, can solve the problems of difficult to obtain a composite material with a uniform structure, easy agglomeration of graphene, affecting the electrochemical performance of the material, etc., achieve good capacity performance and cycle performance, and prevent agglomeration. Effect

Active Publication Date: 2013-02-13
NINGBO GRAPHENE INNOVATION CENT CO LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Shi Gaoquan et al. reported a preparation method of a graphene / polyaniline composite electrode material. In this method, graphene and polyaniline nanofibers were mixed and then vacuum filtered to obtain a graphene / polyaniline composite electrode material. However, in this method, graphene is extremely easy to Agglomeration, and polyaniline cannot be well compounded with graphene, it is difficult to obtain a composite material with uniform structure using the above technology, which affects the electrochemical performance of the material

Method used

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  • Method for preparing grapheme/carbon composite material
  • Method for preparing grapheme/carbon composite material
  • Method for preparing grapheme/carbon composite material

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preparation example Construction

[0025] The invention provides a kind of preparation method of graphene / carbon composite material, comprises the following steps:

[0026] A) Mix and react aniline monomer, oxidant and graphene oxide in liquid crystal state to obtain a graphene oxide / polyaniline composite;

[0027] B) Mix the graphene oxide / polyaniline composite obtained in step A) with an activator and react to obtain a graphene / carbon composite material.

[0028] The present invention uses aniline monomer and graphene oxide in a liquid crystal state as raw materials, fully mixes them, and generates polyaniline between the graphene oxide layers, which can effectively prevent graphene from agglomerating during the activation process, and at the same time, the activation process can The polyaniline attached to the graphene surface forms a porous carbon material, so that the prepared graphene / carbon composite material has good capacity performance and cycle performance.

[0029] The present invention firstly mix...

Embodiment 1

[0041] Use the Hummer method to prepare graphene oxide solution, wash it repeatedly with deionized water, and use barium chloride solution to detect until no white precipitate appears, then treat the graphene oxide aqueous solution in a centrifuge at 5000~10000r / min for 30min, then you can A liquid crystal graphene oxide sol with a concentration range of 0.1 mg / mL-15 mg / mL was obtained.

Embodiment 2

[0043] Mix 1g of aniline monomer with 100mL of graphene oxide hydrosol with a concentration of 1mg / mL, fully dissolve 2.33g of ammonium persulfate in 20mL of deionized water, and then slowly add it dropwise to the mixed sol of aniline monomer and graphene oxide , then react in a hydrothermal tank at 200°C for 8h, wash the reaction product with deionized water and ethanol to obtain a graphene oxide / polyaniline composite product; then mix 1g of the obtained graphene oxide / polyaniline composite with 1g of hydrogen Potassium oxide was mixed and fully ground, then placed in a tube furnace, reacted at 500°C for 48 hours under the protection of nitrogen, and the product was washed with deionized water and dried to obtain a graphene / carbon composite material.

[0044] Carry out X-ray photoelectron scanning to the graphene / carbon composite material that prepares, the result sees figure 1 , figure 1 It is the X-ray photoelectron energy spectrogram of the graphene / carbon composite mater...

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Abstract

The invention provides a method for preparing a grapheme / carbon composite material. The method comprises steps of mixing and reacting aniline monomer, an oxidant and mesomorphic grapheme oxide, obtaining a grapheme oxide / polyaniline compound, mixing and reacting the obtained grapheme oxide / polyaniline compound and an activating agent and obtaining the grapheme / carbon composite material. The aniline monomer and the mesomorphic grapheme oxide serve as raw materials and are mixed completely, polyaniline is produced among layers of grapheme oxide, the agglomeration phenomenon during the grapheme activating process can be avoided effectively, the polyaniline attached to grapheme surfaces forms a multi-hole carbon material through the activating treatment, and the prepared grapheme / carbon composite material has good capacitive and cycle performance.

Description

technical field [0001] The invention relates to the technical field of graphene, in particular to a method for preparing a graphene / carbon composite material. Background technique [0002] A supercapacitor is a new type of energy storage element between a capacitor and a battery. It has high energy density, fast charge and discharge speed, high power density, long cycle life, good safety performance, superior low temperature performance, pollution-free and maintenance-free, etc. Excellent characteristics, widely used in electric vehicles, electronic products and other fields. [0003] At present, the electrode material of supercapacitor is mainly activated carbon, which has the advantages of large specific surface area, large capacity, superior catalytic performance, good stability and electrochemical performance, but the surface of activated carbon is mostly microporous structure, so that it can be effectively used The proportion of the surface of the material is low, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C01B31/04C08G73/02H01G9/042C01B32/05C01B32/184
Inventor 周旭峰曹海亮刘兆平
Owner NINGBO GRAPHENE INNOVATION CENT CO LTD
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