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Porous carbon/carbon nanotube composite material and its preparation method, electrode and supercapacitor

A technology of carbon nanotubes and composite materials, applied in the field of materials, can solve the problems of reducing the conductivity of carbon nanotubes, difficult to activate carbon dense structure, etc.

Active Publication Date: 2021-04-30
内蒙古信敏惠纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The covalent bond method is to treat carbon nanotubes with acid or introduce functional groups or polymers on the surface of carbon nanotubes; the non-covalent bond method is usually to add surfactants to realize the dispersion of carbon nanotubes, but when carbon nanotubes are directly mixed with activated carbon After mixing, the introduction of surface functional groups or other molecular groups of carbon nanotubes will greatly reduce the conductivity of carbon nanotubes themselves, and then the excellent electrical conductivity of carbon nanotubes cannot be exerted. At the same time, simple physical mixing of carbon nanotubes and activated carbon , can not form a good conductive channel between carbon nanotubes and activated carbon, and in the process of mixing slurry, self-agglomeration will occur, and it is not easy to form a dense structure with activated carbon
[0005] Therefore, the current supercapacitor electrode materials still need to be improved

Method used

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  • Porous carbon/carbon nanotube composite material and its preparation method, electrode and supercapacitor
  • Porous carbon/carbon nanotube composite material and its preparation method, electrode and supercapacitor
  • Porous carbon/carbon nanotube composite material and its preparation method, electrode and supercapacitor

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preparation example Construction

[0040] In one aspect of the present invention, the present invention provides a method for preparing a porous carbon / carbon nanotube composite material. According to an embodiment of the present invention, refer to figure 1 , the method includes the following steps:

[0041]S100: Perform a first modification treatment on the porous carbon, so as to obtain a modified porous carbon with a negative charge.

[0042] According to an embodiment of the present invention, in this step, the porous carbon may be mixed with the negatively charged first modifying agent, and the obtained mixture may be subjected to a first solid-phase ball milling treatment to obtain the above-mentioned modified porous carbon. Specifically, a planetary ball mill can be used, and the ball milling medium can be zirconium beads. After the ball milling process is completed, the ball mill product can be dispersed in water and separated from the zirconium beads. , 50min, 60min, 70min, 80min, 90min, 100min, 110...

Embodiment 1

[0074] Embodiment 1: Preparation of modified activated carbon and modified carbon nanotubes

[0075] Carboxymethyl cellulose modified activated carbon: 0.25 g of carboxymethyl cellulose and 5 g of activated carbon (purchased from Kuraray, Japan) were mixed in solid phase, and zirconium beads were added to the mixed powder for solid phase ball milling reaction. 2h, and then add 200ml of distilled water to separate the zirconium beads and the dispersion, and then ultrasonicate the dispersion for 1h, then remove the uncompounded carboxymethyl cellulose by vacuum filtration, collect the filter cake, and dry the filter cake in a vacuum oven at 80°C After 24 hours, a powdered activated carbon modified with carboxymethyl cellulose (ie modified activated carbon) was obtained.

[0076] Polyaniline-modified carbon nanotubes: 0.25 g of polyaniline and 2 g of carbon nanotubes (purchased from Tiannai) were mixed in solid phase, and zirconium beads were added to the mixed powder for solid-p...

Embodiment 2

[0077] Embodiment 2: Composite preparation

[0078] Weigh 1g of the modified activated carbon obtained in Example 1 and disperse it in 100ml of water. After ultrasonication for 2 hours, a uniform and stable dispersion can be obtained. Then, the modified activated carbon dispersion is added to the In the water dispersion of the modified carbon nanotubes obtained in Example 1 (adjusting the pH to be about 3, adopting at least one of dilute hydrochloric acid and dilute ammonium bicarbonate to adjust the pH) dispersion liquid, control the pH value of the dispersion liquid after mixing At about 4, continue to sonicate for 2 hours, then magnetically stir for 4 hours at room temperature, and finally collect the precipitate by centrifugation (8000rpm, 10min), and dry it in vacuum at 70°C for 24 hours, then grind the dried block and pass through a 200-mesh sieve , to obtain activated carbon / carbon nanotube composite material A.

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Abstract

The invention provides a porous carbon / carbon nanotube composite material, a preparation method thereof, an electrode and a supercapacitor. The method includes: performing a first modification treatment on the porous carbon so as to obtain a modified porous carbon with a negative charge; performing a second modification treatment on the carbon nanotube so as to obtain a modified carbon nanotube with a positive charge; The modified porous carbon is mixed with the modified carbon nanotube to obtain the porous carbon / carbon nanotube composite material. The method can make the modified porous carbon and the modified carbon nanotubes self-assemble through electrostatic interaction, and the porous carbon and carbon nanotubes in the obtained composite material are uniformly dispersed and stable, have low internal resistance or good electrical conductivity, and are used for supercapacitors It can significantly improve its specific capacity and cycle stability.

Description

technical field [0001] The invention relates to the field of material technology, and in particular, to a porous carbon / carbon nanotube composite material, a preparation method thereof, an electrode and a supercapacitor. Background technique [0002] As a new type of energy storage device, supercapacitor has become the most promising battery because of its extremely high power density (500-10000W / kg), good cycle life (>500,000 times) and extremely fast charge-discharge rate. One of the chemical energy storage technologies. However, the low energy density (5-10 Wh / kg) of supercapacitors greatly limits its application. The energy density of a supercapacitor is closely related to the conductivity and specific surface area of ​​its electrode material itself. Therefore, the development of electrode materials with high specific surface area and high conductivity is a research hotspot in the field of supercapacitors. [0003] At present, the active material of the electrode m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/36H01G11/38H01G11/24H01G11/86
CPCY02E60/13
Inventor 郝朏王文阁张勃王俊美李金来
Owner 内蒙古信敏惠纳米科技有限公司