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Graphene-asphalt based active carbon as well as preparation method and application thereof

A graphene and pitch-based technology, applied in the field of electrochemical energy storage, can solve the problems of complex synthesis process, high production cost, unsuitable for large-scale production, etc., and achieve the effects of simple preparation method, low production cost, and suitable for large-scale production.

Active Publication Date: 2018-07-10
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although there have been reports on the use of coal tar pitch to prepare activated carbon, the activation temperature is basically higher than 800

Method used

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  • Graphene-asphalt based active carbon as well as preparation method and application thereof
  • Graphene-asphalt based active carbon as well as preparation method and application thereof
  • Graphene-asphalt based active carbon as well as preparation method and application thereof

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preparation example Construction

[0055] The invention provides a kind of preparation method of graphene-pitch based activated carbon, comprises the following steps:

[0056] (A) mix asphalt, graphene and activator, obtain mixed material;

[0057] (B) Under a protective atmosphere, the mixed material in the step (A) is activated at 400-650° C. for 3-10 hours to obtain graphene-pitch-based activated carbon.

[0058] The invention mixes asphalt, graphene and an activator to obtain a mixed material. In the present invention, the mass ratio of the pitch, graphene and activator is preferably 100:(5.26~52.6):(100~200), more preferably 100:(10~40):(120~180), Most preferably, it is 100:(20-30):(140-160).

[0059] In the present invention, the pitch preferably includes coal tar pitch or petroleum pitch, and the petroleum pitch includes solid petroleum pitch or colloidal petroleum pitch. The present invention has no special limitation for the coal tar pitch, and the coal tar pitch well-known to those skilled in the a...

Embodiment 1

[0084] (A) Petroleum pitch is heated at 120°C for 2h, 50g of heated petroleum pitch is mixed with tetrahydrofuran and ethanol, stirred for 6h, and the resulting pitch solution is mixed with graphene slurry (the mass of graphene in the graphene slurry) 5g) mixed, ultrasonic 8h at a frequency of 40kHz, then add 50g KOH, continue ultrasonic 10h at a frequency of 40kHz, and use a rotary evaporator to remove the liquid component in the gained material (collect the organic solvent and the organic solvent in the liquid component Co-solvent recovery and reuse), the remaining material obtained is a mixture of petroleum pitch, graphene and KOH;

[0085] (B) In an argon atmosphere, the mixed material was activated at 500° C. for 4 h, and the mass concentration was 25% H 2 SO 4 The obtained activated material was washed, then washed with deionized water to neutrality, and the solid-liquid separation was carried out by using a polypropylene bag with a pore size of 20 μm, and the obtained ...

Embodiment 2

[0091] (A) Petroleum pitch is heated at 120°C for 2h, 50g of heated petroleum pitch is mixed with toluene and methanol, stirred for 24h, and the resulting pitch solution is mixed with graphene slurry (the mass of graphene in the graphene slurry) 20 g) were mixed, ultrasonicated at a frequency of 40 kHz for 4 h, then 400 mL of 3 mol / L KOH aqueous solution was added, stirred at 800 r / min for 12 h, and the liquid components in the obtained material were removed by heating at 100 °C in a blast oven (collected The organic solvent in the above-mentioned liquid component and co-solvent recycling), the remaining material that obtains is the mixed material of petroleum pitch, graphene and KOH;

[0092] (B) In an argon atmosphere, the mixed material was activated at 450°C for 10 hours, and the activated material was washed with HCl with a mass concentration of 15%, and then washed to neutrality with deionized water. Solid-liquid separation was carried out for a polyethylene film of 0.25...

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Abstract

The invention provides a preparation method of graphene-asphalt based active carbon. Asphalt, graphene and an activating agent are mixed to obtain a mixed material; under the protection atmosphere, the mixed material is subjected to activating treatment at low temperature; the high-quality graphene-asphalt based active carbon is obtained. Compared with a traditional active carbon preparation process, the preparation method has the advantages that when asphalt is used as raw materials for preparing the active carbon, the graphene is added; the activation temperature can be reduced to be 200 DEGC or more; the dosage of the activating agent is reduced by 2 to 3 times; meanwhile, the carbon conversion rate is improved by 30 to 40 percent; the addition of template agents is not needed; the preparation method is simple; the production cost is low; the method is suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy storage, in particular to a graphene-pitch-based activated carbon and its preparation method and application. Background technique [0002] With the rapid development of my country's economy, the available natural resources, such as fossil fuels, have been unable to sustain the needs of life and industry for a long time, and the extensive use of fossil fuels has caused serious environmental pollution, so the development of clean and efficient new energy is imminent . However, in order to maximize the utilization of various new energy sources, suitable energy storage devices are the key. Therefore, there is a need to develop advanced electrode materials for improving the performance of energy storage devices that are currently used in daily life. Supercapacitors have been used in bus systems due to their high power density, long-term cycle stability, and fast charging and dischargin...

Claims

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Application Information

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IPC IPC(8): C01B32/348C01B32/182C01B32/318H01G11/32H01G11/34H01G11/36
CPCC01P2004/03H01G11/32H01G11/34H01G11/36Y02E60/13
Inventor 王俊中成苗王俊英王聪伟
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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