Composite particles composed of active carbon and graphene hybrids, preparation method and application

A technology of activated carbon particles and composite particles, which is applied in the manufacture of hybrid/electric double layer capacitors and electrodes of hybrid capacitors, etc. It can solve the problems of small size of carbon nanomaterials, limited use range, and many micropores of activated carbon, so as to improve the tap density. , Shorten the processing time and improve the conductivity

Active Publication Date: 2015-12-02
TSINGHUA UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, activated carbon has many micropores, and the substances adsorbed in the micropores are not easy to desorb, which limits its scope of use.
At the same time, carbon nanomaterials have many mesopores, and the adsorbed substances are easy to desorb, but they are light in weight and have large volume changes during the process of adsorbing liquids, making it difficult to realize engineering
At the same time, carbon nanomaterials are small in size and are easily taken away in the process of contacting liquid or gas, resulting in loss. New fixing and forming methods are extremely needed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Graphene hybrid (graphene mass fraction is 70%, all the other are carbon nanofibers, bulk density is 300kg / m 3 , the specific surface area is 1600m 2 / g) Grind for 0.1 hour in a grinding device filled with water to form a slurry; the activated carbon particles (average particle diameter is 0.1 micron. Bulk density is 100kg / m 3 , the specific surface area is 3000m 2 / g) added in the above-mentioned slurry, and ground for 3 hours at a rotating speed of 4000 rpm to form a paste (wherein the mass fraction of graphene hybrids is 10% based on the dry powder mass of carbon).

[0026] The above-mentioned paste is extruded by a screw machine, and dried quickly to form a powder, which is pulverized by high-speed shearing to form a composite particle with an average particle diameter of 5 microns (the specific surface area of ​​the composite particle is 2700m 2 / g, the bulk density under 1MPa pressure is 500kg / m 3 , surface conductivity is 40S / cm). The fine powder less than 5 ...

Embodiment 2

[0029] Graphene hybrids (graphene mass fraction is 51%, all the other are 35% carbon nanotubes and 14% nano carbon particles, bulk density is 250kg / m 3 , the specific surface area is 600m 2 / g) Grind in a grinding device filled with water for 3 hours to form a slurry; the activated carbon particles (average particle diameter is 10 microns. Bulk density is 530kg / m3, specific surface area is 2500m 2 / g) added in the above-mentioned slurry, grinded for 10 hours at a rotating speed of 20 rpm to form a paste (wherein the mass fraction of graphene hybrids is 20% based on the dry powder mass of carbon).

[0030] The above-mentioned paste is extruded by a screw machine, and dried quickly to form a powder, which is pulverized by high-speed shearing to form composite particles with an average particle diameter of 15 microns (the specific surface area of ​​the composite particles is 1531m 2 / g, the bulk density under 1MPa pressure is 580kg / m 3 , surface conductivity is 100S / cm). The f...

Embodiment 3

[0033] Graphene hybrid (graphene mass fraction is 90%, all the other are carbon nanotubes, bulk density is 200kg / m 3 , the specific surface area is 1800m 2 / g) Grind for 0.1 hour in a grinding device filled with organic liquid NMP to form a slurry; the activated carbon particles (the particle average diameter is 20 microns, and the bulk density is 720kg / m 3 , the specific surface area is 2200m 2 / g) added in the above-mentioned slurry, and ground for 3 hours at a rotating speed of 2000 rpm to form a paste (wherein the mass fraction of graphene hybrids is 5% based on the dry powder mass of carbon).

[0034] The above-mentioned paste is extruded by a screw machine, and dried quickly to form a powder, which is pulverized by high-speed shearing to form a composite particle with an average particle diameter of 20 microns (the specific surface area of ​​the composite particle is 2180m 2 / g, the bulk density under 1MPa pressure is 700kg / m 3 , surface conductivity is 10S / cm). The f...

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Abstract

The present invention provides composite particles composed of active carbon and grapheme hybrids, a preparation method and an application. The composite particles are composed of active carbon and graphene hybrids, wherein the graphene hybrids have a mass fraction of 1 to 20 percent, and the composite particles have an average grain diameter of 5 to 100 micrometers; the structure of the active carbon and the graphene hybrids is that: the graphene hybrids are winded around the active carbon particles and at the surfaces of the active carbon particles; and the composite particles have a specific surface area of 600 to 2700 m2 / g, a bulk density of 500 to 800 kg / m3 under the pressure of 1 MPa, and a surface conductivity of 1-100 S / cm. The present invention further discloses the preparation method of the composite particles and the application thereof. The composite particles may be served as gas absorption materials or liquid hydrocarbon absorption materials, and may be also served as electrode materials of a supercapacitor, thereby providing a good electric channel and further providing the capacity.

Description

technical field [0001] The invention belongs to the technical field of composite particles and their preparation, and in particular relates to a composite particle composed of activated carbon and graphene hybrids, a preparation method and an application. Background technique [0002] Activated carbon is a class of SP 3 The material composed of hybrid carbon and having a large specific surface area is currently the electrode material of organic liquid-based supercapacitors, which can work at 2.7-3V, so that the energy density of supercapacitor-based devices can reach 6-7Wh / kg. Recently, due to the rapid development of the supercapacitor market, supercapacitor products with higher power density are required. However, the conductivity between activated carbons is poor. Although there are nano-carbon particles such as superP, the conductivity is still a bottleneck at a large charge-discharge rate. [0003] Carbon nanomaterial is a new type of material with large specific surf...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H01G11/38H01G11/24H01G11/86
CPCY02E60/13
Inventor骞伟中谢青余云涛魏小波田佳瑞张强魏飞朱贤麟
OwnerTSINGHUA UNIV