A method for preparing carbon-based composite materials for supercapacitors

A carbon-based composite material, supercapacitor technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc. The effect of increasing effective specific surface area and electrical conductivity, increasing surface wettability, and avoiding interlayer stacking

Active Publication Date: 2019-09-24
XI AN JIAOTONG UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the existence of van der Waals force and π-π strong force between graphene layers, graphene is prone to agglomeration, which reduces the specific surface area and conductivity for forming an effective electric double layer.

Method used

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  • A method for preparing carbon-based composite materials for supercapacitors

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Experimental program
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Effect test

Embodiment 1

[0036] (1) Add 10 mg of PMMA monomer and 8 mg of potassium persulfate (KPS) to 300 ml of deionized water, and stir with a magnetic stirrer for 4 hours at 70 ° C under a nitrogen atmosphere;

[0037] (2) Take 150ml of the solution of step (1), add 8ml of acrylonitrile (AN) and 8mg of potassium persulfate (KPS) into 100ml of deionized water, and stir with a magnetic stirrer for 2 hours under a nitrogen atmosphere at 70°C;

[0038] (3) the PMMA / PAN solution of step (2) is centrifuged, washed several times with deionized water and dried;

[0039] (4) Weigh 60 mg of GO powder, add 30 ml of deionized water, and sonicate for 1 hour;

[0040] (5) Weigh 1 g of the PMMA / PAN powder in step (3) and add deionized water, and ultrasonicate for 1 hour;

[0041] (6) Mix and sonicate the solutions in step (4) and step (5) for 1 hour;

[0042] (7) The mixed solution in the vacuum filtration step (6) is dried to obtain GO / PMMA / PAN;

[0043] (8) heating the GO / PMMA / PAN powder in step (7) at 200...

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Abstract

The invention discloses a preparation method of a carbon-based composite material for a supercapacitor. According to the method, the graphene oxide (GO) and a polymethyl methacrylate / polyacrylonitrile(PMMA / PAN) core-shell structure are uniformly mixed up. After the suction filtration step, the PMMA is removed through high-temperature carbonization, and then the material is reduced to obtain rGO / PAN. Finally, the KOH activation is conducted to obtain the porous rGO / PAN composite material. According to the preparation method of the material, the PMMA / PAN core-shell structure is used as a template, so that the graphene is prevented from being stacked up. Meanwhile, the material comprises abundant large holes, mesopores and micropores, so that a double-electric layer is formed. The effectivespecific surface area and the electric conductivity are improved. Moreover, the whole preparation process is low in cost, green and environment-friendly.

Description

technical field [0001] The invention relates to the field of electrochemical technology, in particular to the field of supercapacitors, in particular to a method for preparing a carbon-based composite material used for supercapacitors. Background technique [0002] Supercapacitor is a new type of electrochemical energy storage device between traditional capacitors and secondary batteries. It has large capacity, high power density, long cycle life, fast charge and discharge speed, wide operating temperature range, and no pollution to the environment. advantage. At present, it has been widely used in portable electronic equipment, electric vehicles, backup power systems and other fields. However, compared with batteries, the energy density of supercapacitors is very small, and the energy storage and retention time are limited. In order to meet practical applications and needs, how to realize supercapacitors with both high power density and high energy density has become one ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/32H01G11/26H01G11/86H01G11/48
Inventor 袁宇丹曾剑桥孙艺赵胤超孙伟杨莉赵策洲
Owner XI AN JIAOTONG UNIV
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