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Method for Realizing Graphene In-Situ Composite Activated Carbon Using Supercritical Fluid

A technology of supercritical fluid and in-situ recombination, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, etc., can solve problems such as difficulty in guaranteeing product quality consistency, difficulty in dispersing graphene powder, and inconspicuous performance improvement. Achieve real-time high-efficiency compounding, excellent electrical conductivity, and improved electrical conductivity

Active Publication Date: 2017-02-15
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although graphene has excellent performance, there are still bottlenecks in its use. The secondary dispersion and cost of graphene powder are the most important limiting factors restricting the large-scale use of graphene.
At present, the existing graphene preparation methods on the market mainly include oxidation-reduction method and chemical vapor deposition method, etc., but the graphene powder obtained by the above methods is difficult to redisperse during use, resulting in poor performance improvement after compounding with active materials. obvious
Moreover, the above methods are all intermittent production, not only difficult to guarantee the consistency of product quality, but also high preparation cost and expensive price.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] According to the volume ratio of expanded graphite powder weight to dimethylformamide (DMF) 2kg / m 3 , put graphite powder and organic solvent into the container, mix them evenly under the action of ultrasound, and then send them to the autoclave. The graphite layers are fully intercalated by supercritical fluid molecules. Then, according to 10 times the mass of graphite, the coconut shell activated carbon is sent into the supercritical fluid to fully mix with the intercalated expanded graphite, and stay for 60 minutes so that the supercritical fluid can further activate the activated carbon. The organic solvent is filtered off to obtain the mixed slurry of the intercalated expanded graphite and secondary activated carbon. The mixed slurry is transported by nitrogen with a solid-gas mass ratio of 300kg / kg, a temperature of 300°C, and a pressure of 6MPa. The mixed material is sprayed from a single nozzle into an atmospheric pyrolysis furnace with a temperature of 800°C....

Embodiment 2

[0040] According to the ratio of natural graphite powder weight to solvent volume, it is 20kg / m 3 , add graphite powder and solvent into the container, the solvent is dimethylformamide (DMF) and liquid CO 2 A mixed solvent, dimethylformamide (DMF) and liquid CO 2 The mass ratio is 1:1. The material is mixed evenly by mechanical stirring and sent to the autoclave. The temperature of the material in the autoclave is controlled at 100°C and the pressure is 8MPa, so that the material stays in the supercritical fluid for 50 minutes, so that the interlayer of graphite is fully covered by supercritical fluid molecules. intercalation. Then the coal-based activated carbon is sent into the supercritical fluid to fully mix with the intercalated expanded graphite according to 20 times the mass of the graphite, and stay for 30 minutes so that the supercritical fluid can further activate the activated carbon. The organic solvent is filtered off to obtain the mixed slurry of the intercala...

Embodiment 3

[0042] According to the ratio of expanded graphite powder weight to solvent volume 50kg / m 3 , adding graphite powder and solvent into the container, the solvent is N-methylpyrrolidone (NMP) and H 2 Mixed solvent of O, NMP and H 2 The mass ratio of O is 1:1. Ultrasonic stirring is used to mix the materials evenly and send them to the autoclave. The temperature of the materials in the autoclave is controlled at 375 ° C and the pressure is 23 MPa, so that the materials stay in the supercritical fluid for 60 minutes, so that the interlayer of graphite is fully covered by supercritical fluid molecules. intercalation. Then, 50 times the mass of graphite, the synthetic resin activated carbon is sent into the supercritical fluid to fully mix with the intercalated expanded graphite, and stay for 60 minutes so that the supercritical fluid can further activate the activated carbon. The organic solvent is filtered off to obtain the mixed slurry of the intercalated expanded graphite and...

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PUM

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Abstract

The invention relates to a method for achieving in situ composition of graphene and activated carbon through supercutical fluid. According to the method, intercalation is conducted on graphite through the supercutical fluid, and then the activated carbon is added; secondary activation is conducted on the activated carbon through the supercutical fluid and the activated carbon is completely mixed with the expanded graphite generated after the intercalation is conducted, then the mixed material is ejected to a high-temperature normal-pressure thermal decomposition furnace in a single-point or multi-point oppositely-ejecting mode, and the expanded graphite generated after the intercalation is conducted can be stripped to be graphene through rapid decompression under the high-temperature thermal environment; the graphene is composited with the activated carbon generated after the secondary activation is conducted in real time in the multiphase flow ejection process, and the composite material of the graphene evenly dispersed in the secondary activation activated carbon is prepared. Compared with the prior art, the problem that the graphene is extremely easy to cluster, the graphene is made to be evenly mixed with the super activated carbon, so that the super activated carbon composite material is obtained through graphene in situ modification.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional materials, and in particular relates to a method for realizing graphene in-situ composite activated carbon by using supercritical fluid. Background technique [0002] Activated carbon has the characteristics of high volume specific surface area, low cost, and good compatibility with electrolyte, and is the most widely used supercapacitor electrode material. However, at present, conventional carbon-based materials have problems such as poor conductivity, low heat dissipation, and small specific surface area, which cannot meet the energy storage requirements of supercapacitors, forming an industrial bottleneck. [0003] Graphene is a carbon nanomaterial with a honeycomb two-dimensional lattice structure in which carbon atoms are closely packed in an sp2 hybrid system. Because graphene has a unique two-dimensional structure, excellent electrical conductivity, excellent mechanical a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/38H01G11/86
Inventor 高寒阳胡国新
Owner SHANGHAI JIAOTONG UNIV