Preparation method of mesoporous activated carbon for supercapacitor

A technology of mesoporous activated carbon and supercapacitor, applied in chemical instruments and methods, hybrid capacitor electrodes, inorganic chemistry, etc., can solve the problems of increasing the mesoporous ratio of activated carbon, and achieve the effect of improving rate performance, wide source and low price

Active Publication Date: 2020-08-18
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems existing in the prior art, the present invention provides a method for preparing mesoporous activated carbon for supercapacitors, which can solve the problem of carbon materials for supercapacitors in Rate performance issues at high current densities

Method used

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  • Preparation method of mesoporous activated carbon for supercapacitor
  • Preparation method of mesoporous activated carbon for supercapacitor
  • Preparation method of mesoporous activated carbon for supercapacitor

Examples

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Effect test

Embodiment 1

[0030] The coal tar pitch is crushed to less than 0.15 mm, and the crushed coal tar pitch is oxidized and modified with 100 mL of concentrated sulfuric acid and 10 mL of hydrogen peroxide. The modification time is 24 hours, and the oxygen-containing functional group of the coal tar pitch after oxidation modification is 35.3%. The coal tar pitch treated under the above conditions was added to a carboxymethyl cellulose solution with a concentration of 2%, and pretreated at 60° C. for 2 hours to obtain a coal tar pitch composite. The coal tar pitch composite material was obtained by adding the coal tar pitch compound into the activator KOH for homogenization treatment, wherein the mass ratio of the activator KOH to the coal tar pitch compound was 2:1, the homogenization treatment temperature was 60°C, and the homogenization treatment time was 3h . After the homogenization treatment, the coal tar pitch composite material was directly activated. The activation treatment temperature...

Embodiment 2

[0032]The coal tar pitch is crushed to less than 0.15 mm, and the crushed coal tar pitch is oxidized and modified with 100 mL of concentrated sulfuric acid and 10 mL of hydrogen peroxide. The modification time is 24 hours, and the oxygen-containing functional group of the coal tar pitch after oxidation modification is 35.3%. The coal tar pitch treated under the above conditions was added to a carboxymethyl cellulose solution with a concentration of 2%, and pretreated at 70° C. for 2 hours to obtain a coal tar pitch composite. The coal tar pitch composite material was obtained by adding the coal tar pitch compound into the activator KOH for homogenization treatment, wherein the mass ratio of the activator KOH to the coal tar pitch compound was 2:1, the homogenization treatment temperature was 60°C, and the homogenization treatment time was 3h . After the homogenization treatment, the coal tar pitch composite material was directly activated. The activation treatment temperature ...

Embodiment 3

[0034] The coal tar pitch is crushed to less than 0.15 mm, and the crushed coal tar pitch is oxidized and modified with 100 mL of concentrated sulfuric acid and 8 mL of hydrogen peroxide. The modification time is 16 hours, and the oxygen-containing functional group of the coal tar pitch after oxidation modification is 28.1%. The coal tar pitch treated under the above conditions was added to a carboxymethyl cellulose solution with a concentration of 2%, and pretreated at 80° C. for 3 hours to obtain a coal tar pitch composite. The coal tar pitch composite material was obtained by adding the coal tar pitch compound into the activator KOH for homogenization treatment, wherein the mass ratio of the activator KOH to the coal tar pitch compound was 3:1, the homogenization treatment temperature was 60°C, and the homogenization treatment time was 2h . After the homogenization treatment, the coal tar pitch composite material was directly activated. The activation treatment temperature ...

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Abstract

The invention discloses a preparation method of mesoporous activated carbon for a supercapacitor, and relates to the field of activated carbon material preparation. According to the method, coal pitchand gel are used as raw materials, and the activated carbon for the supercapacitor is prepared through the steps of modification treatment, pretreatment, homogenization treatment, activation and aftertreatment. The mesoporous rate of the prepared activated carbon is 24%-41%, and the specific surface area of the prepared activated carbon is 1600-2420 m<2> / g. The gel is used as a skeleton, the structure of a cross-linked three-dimensional structure formed by the gel and the coal pitch in the carbonization and activation process is realized, the pore size distribution is easy to regulate and control, the mesoporous rate is higher than that of activated carbon used for the supercapacitor at present, and the electrochemical performance of the activated carbon under a large current is greatly improved.

Description

technical field [0001] The invention relates to the field of preparation of activated carbon materials, in particular to a method for preparing mesoporous activated carbon for supercapacitors. Background technique [0002] As a new energy storage device between traditional capacitors and batteries, supercapacitors have the characteristics of high energy density, high power density, long service life, and wide operating temperature range. Because of this unique advantage, it is widely used in various fields such as new energy, electronic products, wind power generation, rail transit, military, and aerospace. With the continuous expansion of application fields, higher requirements are put forward for the specific capacity, cycle life and rate performance of supercapacitors under high current charge and discharge conditions. [0003] As a key material for the commercialization of supercapacitors, activated carbon has a great influence on the performance of capacitors. The imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/33C01B32/348H01G11/24H01G11/34H01G11/44
CPCC01B32/33C01B32/348H01G11/24H01G11/34H01G11/44Y02E60/13
Inventor 张劲斌王芳平李晨阳罗英涛杜娟李贺
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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