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Preparation method of graphene-modified activated carbon for supercapacitor

A supercapacitor and graphene modification technology, which is applied in chemical instruments and methods, hybrid capacitor electrodes, inorganic chemistry, etc., can solve the problem that the performance of capacitors cannot be greatly improved, the heat dissipation performance of supercapacitors is not ideal, and the pore size distribution is not good. Reasonable and other issues, to achieve the effect of low comprehensive use cost, improved heat dissipation performance, and easy industrial production

Active Publication Date: 2014-04-16
SHANDONG OBO NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the conductivity of activated carbon is poor and the pore size distribution is unreasonable. The microporous structure of activated carbon contributes the main specific surface area, and the migration resistance of ions in the micropores is relatively large. In addition, the heat dissipation performance of supercapacitors made of traditional activated carbon is not ideal.
Therefore, no matter how its source of raw materials changes and how its preparation process is improved, the specific surface area of ​​traditional activated carbon has reached its peak, and the performance of capacitors produced by traditional activated carbon can no longer achieve great breakthroughs.

Method used

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  • Preparation method of graphene-modified activated carbon for supercapacitor

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Embodiment 1

[0023] A preparation method of activated carbon for graphene oxide modified supercapacitor is to wash 900-mesh fruit shell activated carbon with deionized water twice, add graphene oxide aqueous dispersion, ultrasonically treat for 0.5h, heat to 60°C, and stir at constant temperature 0.5h, then add ammonia water and hydroxylamine hydrochloride mixed solution for reduction, and finally filter the reaction system and dry for 1h to obtain the activated carbon for graphene oxide modified supercapacitor in this embodiment; wherein, fruit shell activated carbon and graphite oxide The mass ratio of olefin aqueous dispersion is 1:1, and the molar mass ratio of ammoniacal liquor and hydroxylamine hydrochloride is 1:2, and the mass ratio of graphene oxide and hydroxylamine hydrochloride is 1:0.5, and graphene oxide aqueous dispersion is graphene oxide and The mass ratio of deionized water is a mixture of 1‰, and the sheet diameter of graphene oxide is 90nm.

Embodiment 2

[0025] A preparation method of activated carbon for graphene oxide modified supercapacitor is to wash 10000 mesh woody activated carbon with deionized water for 5 times, add graphene oxide aqueous dispersion, ultrasonically treat for 10 hours, heat to 100°C, and stir at constant temperature for 10 hours, Then add ammonia water and hydroxylamine hydrochloride mixed solution for reduction, and finally filter and dry the reaction system for 16 hours to obtain the activated carbon for the graphene oxide modified supercapacitor of this embodiment; wherein, woody activated carbon and graphene oxide water dispersion The mass ratio of ammonia water and hydroxylamine hydrochloride is 1:100, the molar mass ratio of ammonia water and hydroxylamine hydrochloride is 5:1, the mass ratio of graphene oxide and hydroxylamine hydrochloride is 1:5, and the graphene oxide aqueous dispersion is the mixture of graphene oxide and deionized water. With a mass ratio of 20% of the mixture, the graphene ...

Embodiment 3

[0027] A preparation method of activated carbon for graphene oxide modified supercapacitors is to wash 1000 mesh straw activated carbon with deionized water for 4 times, add graphene oxide aqueous dispersion, ultrasonically treat for 2 hours, heat to 90°C, and stir at constant temperature for 5 hours. Then add ammonia water and hydroxylamine hydrochloride mixed solution for reduction, and finally filter and dry the reaction system for 20 hours to obtain the activated carbon for graphene oxide modified supercapacitor in this embodiment; wherein, straw activated carbon and graphene oxide aqueous dispersion The mass ratio of ammonia water and hydroxylamine hydrochloride is 1:30, the molar mass ratio of ammonia water and hydroxylamine hydrochloride is 2:1, the mass ratio of graphene oxide and hydroxylamine hydrochloride is 1:1, and the graphene oxide aqueous dispersion is the mixture of graphene oxide and deionized water. The mass ratio of the mixture is 3%, and the sheet diameter ...

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Abstract

The invention discloses a preparation method of graphene-modified activated carbon for a supercapacitor and belongs to the technical field of electrode material preparation. The method comprises the steps of taking one or more of traditional shell, wood and straw activated carbon as raw materials, removing impurities, matching graphene oxide with specific parameters, performing high-temperature activation in a deionized water solution, reducing the graphene oxide to graphite with ammonium hydroxide and hydroxylammonium chloride, and performing dewatering and drying to obtain the graphene-modified activated carbon for the supercapacitor. The activated carbon prepared with the method is 1900-2010 m<2> in specific surface area and 0.30-0.33 g / ml in tap density. The supercapacitor made of the activated carbon is above 305 F / g in mass specific capacitance and 193 F / cm<2> in volume specific capacitance.

Description

technical field [0001] The invention belongs to the technical field of electrode material preparation, and in particular relates to a method for preparing activated carbon for graphene oxide modified supercapacitors. The method uses one or more of traditional fruit shell, wood and straw activated carbon as raw materials. Impurities, graphene oxide matching specific parameters, activated in deionized aqueous solution at high temperature, using ammonia water and hydroxylamine hydrochloride to reduce graphene oxide to graphene, and then dehydrating and drying to obtain graphene-modified activated carbon for supercapacitors. Background technique [0002] Supercapacitor is a new type of electrochemical energy storage device. Because it is designed and manufactured based on electrochemical principles, it is also called an electrochemical capacitor, which generally refers to a capacitor with high power and high energy density. Supercapacitors have the advantages of fast charging a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/08H01G11/32C01B32/198C01B32/354
CPCY02E60/13
Inventor 王云峰李晓斐
Owner SHANDONG OBO NEW MATERIAL CO LTD
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