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Graphene powder and preparation method thereof

A technology of graphene powder and graphite, which is applied in the field of graphene powder and its preparation, can solve the problems of unfavorable large-scale production of graphene powder, high energy consumption, and low efficiency, and achieve low lamellar stacking degree and high dispersion Good results

Active Publication Date: 2015-07-22
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the spray drying technology used in the prior art can obtain graphene powder with a lower degree of agglomeration and better dispersion, the spray drying technology has low efficiency and high energy consumption, and does not utilize large-scale production of graphene powder.

Method used

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  • Graphene powder and preparation method thereof

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Effect test

preparation example Construction

[0030] The invention provides a kind of preparation method of graphene powder, comprises the following steps:

[0031] a, graphite oxide is reacted with a dispersant to obtain an intermediate product, and the dispersant includes an ammonium salt;

[0032] b. Heat-treating the intermediate product to obtain graphene powder.

[0033] In the present invention, the dispersant can reduce the moisture content in the graphite oxide, avoid the strong capillary force generated by the graphene oxide sheets in the dehydration process, and weaken the degree of close contact between the graphene oxide sheets, making the present invention The degree of agglomeration of the obtained graphene powder is lower and the dispersibility is better; and the dispersant in the present invention is thermally decomposed in the process of heat treatment to produce a large amount of gas, and the gas produced can peel off graphite oxide, further weakening the present invention. The degree of agglomeration ...

Embodiment 1

[0061] Under the condition of stirring, 10 g of natural graphite with a particle size of 2 μm and 200 mL of fuming nitric acid were first mixed, 100 g of sodium chlorate was added to the obtained mixture, and oxidation reaction was carried out at 60° C. for 96 hours to obtain a reaction solution.

[0062] After the above reaction solution was left to stand for 24 hours, sodium carbonate was added to the reaction solution to make the pH of the reaction solution 11, and the reaction product in the reaction solution was flocculated to obtain graphite oxide.

[0063] After the above-mentioned graphite oxide was washed with water until neutral, the graphite oxide and ammonium bicarbonate were dispersed in water at a mass ratio of 1:1, and then reacted at 15°C for 24 hours to obtain an intermediate product. The above intermediate product was dried at 40° C. for 96 hours under vacuum conditions to obtain a pre-dried product; the pre-dried product was heat-treated at 80° C. for 30 min ...

Embodiment 2

[0066] Graphite oxide with a particle size of 100 μm and ammonium carbonate were dispersed in water at a mass ratio of 1:10, and then reacted at 40° C. for 96 hours to obtain an intermediate product.

[0067]The above intermediate product was dried at 80° C. for 12 hours under vacuum conditions to obtain a pre-dried product; the pre-dried product was heat-treated at 800° C. for 0.5 min to obtain graphene powder. According to the method described in Example 1, the dispersibility and carbon-oxygen mass ratio of the graphene powder obtained in Example 2 are detected, and the test result is that the layer stacking degree of the graphene powder obtained in Embodiment 2 of the present invention is relatively low. Low, good dispersion, the carbon to oxygen mass ratio of graphene powder is 2:1.

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Abstract

The present invention provides a graphene powder preparation method, which comprises: a, carrying out a reaction of graphite oxide and a dispersant to obtain an intermediate product, wherein the dispersant comprises an ammonium salt; and b, carrying out a heat treatment on the intermediate product to obtain the graphene powder. According to the present invention, the close contact degree of the graphite oxide sheet layers can be weakened through the dispersant, such that the obtained graphene powder of the present invention has characteristics of low agglomeration degree and good dispersion property; the dispersant is subjected to thermal decomposition to produces gas during the heat treatment process and the gas makes the graphite oxide be peeled, such that the agglomeration degree of the obtained graphene powder of the present invention is further weakened so as to obtain the graphene powder having the good dispersion property; and the graphene powder having the good dispersion property can be obtained without the spray drying compared with the method in the prior art, such that the graphene powder preparation method of the present invention has characteristics of high efficiency and low energy consumption, and can be used for large-scale production of the graphene powder.

Description

technical field [0001] The invention relates to the technical field of graphene, in particular to a graphene powder and a preparation method thereof. Background technique [0002] Graphene is a two-dimensional material with a single-layer sheet structure composed of carbon atoms and a thickness of only one carbon atom. Graphene has shown excellent performance in many aspects. For example, graphene is almost completely transparent, absorbing only 2.3% of light, and its light transmission is very good; the thermal conductivity of graphene is as high as 5300W / m K, which is higher than Carbon nanotubes and diamonds; the electron mobility of graphene at room temperature exceeds 15,000 cm 2 / V s, which is higher than that of carbon nanotubes and silicon crystals; the resistivity of graphene is only 10 -6 Ω·cm, lower than copper or silver, is currently the material with the smallest resistivity; in addition, graphene is also the thinnest but hardest material. The preparation of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 周旭峰刘兆平秦志鸿胡建国
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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