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Carbon cloth surface modification method used for flexible supercapacitor electrode

A supercapacitor and surface modification technology, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double layer capacitors, etc., can solve the problems of low specific capacitance of carbon cloth, high calcination temperature, and unsatisfactory supercapacitor electrodes, etc., and achieve low cost , uniform surface, and easy industrial promotion

Active Publication Date: 2018-06-15
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the calcination temperature of this technology is relatively high, which needs to reach 600-1100°C, and the specific capacitance of the carbon cloth prepared by it is relatively low, which cannot meet the needs of supercapacitor electrodes.

Method used

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  • Carbon cloth surface modification method used for flexible supercapacitor electrode
  • Carbon cloth surface modification method used for flexible supercapacitor electrode
  • Carbon cloth surface modification method used for flexible supercapacitor electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The invention provides a carbon cloth surface modification method for flexible supercapacitor electrodes, comprising the following steps:

[0038] S1: Dissolve 3g of potassium permanganate in the mixed acid of 20ml of concentrated sulfuric acid and 10ml of concentrated nitric acid to form a uniform mixed solution, place carbon in the mixed solution, keep the temperature at 5°C for 3 hours, add 100ml of deionized water, Keep the temperature at 25°C for 5 hours, add 5ml of hydrogen peroxide to prepare carbon oxide cloth; then wash the carbon oxide cloth with deionized water first and then with ethanol, and repeat the above washing steps for 3 times until the washing liquid is neutral. Finally, dry the carbon dioxide at 60°C for 15 hours;

[0039] S2: Weigh 1g of dried carbon oxide cloth and 5g of sodium amide and place them in an iron crucible. Under the protection of nitrogen atmosphere, heat to 320°C at a heating rate of 3°C / min, keep it warm for 5h, and use it after na...

Embodiment 2

[0056] The invention provides a carbon cloth surface modification method for flexible supercapacitor electrodes, comprising the following steps:

[0057] S1: Dissolve 3g of potassium permanganate in the mixed acid of 20ml of concentrated sulfuric acid and 10ml of concentrated nitric acid to form a uniform mixed solution, place carbon in the mixed solution, keep the temperature at 0°C for 3 hours, add 100ml of deionized water, Keep the temperature at 25°C for 5 hours, add 5ml of hydrogen peroxide to prepare carbon oxide cloth; then wash the carbon oxide cloth with deionized water first and then with ethanol, and repeat the above washing steps for 3 times until the washing liquid is neutral. Finally, dry the carbon dioxide at 60°C for 15 hours;

[0058] S2: Weigh 1g of dried carbon oxide cloth and 5g of sodium amide and place them in an iron crucible. Under the protection of nitrogen atmosphere, heat to 300°C at a heating rate of 2°C / min, keep it warm for 6h, and use it after na...

Embodiment 3

[0061] The invention provides a carbon cloth surface modification method for flexible supercapacitor electrodes, comprising the following steps:

[0062] S1: Dissolve 3g of potassium permanganate in the mixed acid of 20ml of concentrated sulfuric acid and 10ml of concentrated nitric acid to form a uniform mixed solution, place carbon in the mixed solution, keep the temperature at 10°C for 2 hours, add 100ml of deionized water, Keep the temperature at 30°C for 3 hours, add 5ml of hydrogen peroxide to prepare carbon oxide cloth; then wash the carbon oxide cloth with deionized water first and then with ethanol, and repeat the above washing steps for 3 times until the washing liquid is neutral. Finally, dry the carbon dioxide at 70°C for 10 hours;

[0063] S2: Weigh 1g of dried carbon oxide cloth and 5g of sodium amide and place them in an iron crucible. Under the protection of nitrogen atmosphere, heat to 350°C at a heating rate of 4°C / min, keep it for 4h, and use it after natura...

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Abstract

The invention provides a carbon cloth surface modification method used for a flexible supercapacitor electrode. The carbon cloth surface modification method comprises the following steps that S1: firstly the carbon cloth is arranged in the mixed solution of potassium permanganate and concentrated acid to perform first step of reaction, then the deionized water is added to perform second step of reaction, finally hydrogen peroxide is added and the carbon oxide cloth is prepared, then the carbon oxide cloth is repeatedly washed by the deionized water and ethyl alcohol in turn to the neutral state and dried; and S2: finally the carbon oxide cloth after drying processing of the step S1 is calcinated and reduced by sodium amide under the nitrogen environment and then repeatedly washed by the deionized water and the ethyl alcohol in turn until the washing solution is neutral and dried so as to obtain the surface modified carbon cloth. The modified carbon cloth prepared by the method is uniform in surface and high in specific capacitance, and the capacitance retention rate is more than 85% when the current density is increased to 20mA / cm2 from 1mA / cm2 so as to have excellent rate performance. Besides, the method is simple in technology, low in cost and simple in industrial promotion.

Description

technical field [0001] The invention relates to the field of electrode material preparation, in particular to a method for modifying the surface of carbon cloth used for flexible supercapacitor electrodes. Background technique [0002] Carbon cloth is the abbreviation of "carbon fiber cloth", which is a textile composed of interlaced carbon fibers. Carbon cloth is a new type of fiber material with a carbon content of more than 95%. It not only has the inherent characteristics of carbon materials, but also has the flexibility and processability of textile fibers. It has high specific strength and good creep resistance. Low density, good thermal and chemical stability, low thermal expansion coefficient and high electrical conductivity, etc., are often used to prepare current collectors and substrates for head electrodes. However, due to the smooth surface of carbon cloth, small specific surface area, and chemical inertness, its specific capacitance (1-2F / g, about 10mF / cm 2 )...

Claims

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Application Information

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IPC IPC(8): H01G11/40H01G11/86
CPCH01G11/40H01G11/86Y02E60/13
Inventor 陈德志周帅权红英
Owner NANCHANG HANGKONG UNIVERSITY
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