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High-conductivity flexible graphite/mesoporous graphitized carbon composite membrane electrode preparation method

A graphitized carbon and flexible graphite technology, applied in battery electrodes, hybrid capacitor electrodes, hybrid/electric double-layer capacitor manufacturing, etc., can solve the problem that the electrochemical performance of graphene flexible capacitors is lower than expected, the conductive film is too dense, and the electrolyte problems such as poor wettability, to achieve the effect of improving agglomeration, low cost and improving performance

Inactive Publication Date: 2017-05-17
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the prepared conductive film has shortcomings such as too dense and low specific surface area. These factors lead to problems such as poor electrolyte wettability and low specific capacity when using flexible supercapacitors, making the electrochemical performance of graphene flexible capacitors far away. Lower than expected

Method used

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  • High-conductivity flexible graphite/mesoporous graphitized carbon composite membrane electrode preparation method
  • High-conductivity flexible graphite/mesoporous graphitized carbon composite membrane electrode preparation method
  • High-conductivity flexible graphite/mesoporous graphitized carbon composite membrane electrode preparation method

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Experimental program
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Effect test

Embodiment 1

[0025] 1. Mix graphene oxide (50 mg) and porous graphitized carbon at a mass ratio of 1:1, add the mixture to 50 mL of water, and ultrasonicate for 20 minutes to prepare a uniformly mixed graphene oxide / mesoporous graphitized carbon solution;

[0026] 2. The mixed dispersion liquid in step 1 is vacuum-filtered for 12h to obtain the graphene oxide / mesoporous graphitized carbon composite film of vacuum suction filtration, and the graphene oxide / porous graphitized carbon composite film is placed at room temperature (25° C. ) drying for 24h to obtain a graphene oxide / mesoporous graphitized carbon composite film;

[0027] 3. Add the graphene oxide / mesoporous graphitized carbon composite film to 5 mL of hydriodic acid at 90°C, react for 2 hours, wash the reduced composite film with deionized water, and dry it in a vacuum oven at 50°C for 12 hours. A graphene / mesoporous graphitized carbon composite film was obtained.

Embodiment 2

[0029] 1. Mix graphene oxide (50 mg) and porous graphitized carbon at a mass ratio of 10:1, add the mixture to 50 mL of water, and ultrasonicate for 20 minutes to prepare a uniformly mixed graphene oxide / mesoporous graphitized carbon solution;

[0030] 2. The mixed dispersion liquid in step 1 is vacuum-filtered for 12h to obtain the graphene oxide / mesoporous graphitized carbon composite film of vacuum suction filtration, and the graphene oxide / porous graphitized carbon composite film is placed at room temperature (25° C. ) drying for 24h to obtain a graphene oxide / mesoporous graphitized carbon composite film;

[0031] 3. Add the graphene oxide / mesoporous graphitized carbon composite film to 10 mL of hydriodic acid at 90°C, react for 2 hours, wash the reduced composite film with deionized water, and dry it in a vacuum oven at 50°C for 12 hours. A graphene / mesoporous graphitized carbon composite film was obtained.

Embodiment 3

[0033] 1. Mix graphene oxide (50mg) and porous graphitized carbon at a mass ratio of 5:1, add the mixture to 50mL of water, and ultrasonicate for 20min to prepare a uniformly mixed graphene oxide / mesoporous graphitized carbon solution;

[0034] 2. The mixed dispersion liquid in step 1 is vacuum-filtered for 12h to obtain the graphene oxide / mesoporous graphitized carbon composite film of vacuum suction filtration, and the graphene oxide / porous graphitized carbon composite film is placed at room temperature (25° C. ) drying for 24h to obtain a graphene oxide / mesoporous graphitized carbon composite film;

[0035] 3. Add the graphene oxide / mesoporous graphitized carbon composite film to 10mL of hydrobromic acid at 90°C, react for 2h, wash the reduced composite film with deionized water, and dry it in a vacuum oven at 50°C for 12h. A graphene / mesoporous graphitized carbon composite film was obtained.

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Abstract

The invention discloses a high-conductivity flexible graphite / mesoporous graphitized carbon composite membrane electrode preparation method. The method comprises the following steps: graphene oxide and porous graphitized carbon are mixed and dispersed to prepare a uniformly-dispersed mixed dispersion liquid; the mixed dispersion liquid is subjected to vacuum filtration, and after drying, a graphene oxide / mesoporous graphitized carbon composite membrane is obtained; and the prepared graphene oxide / mesoporous graphitized carbon composite membrane is subjected to reduction treatment to obtain the above flexible electrode. The prepared composite membrane has excellent flexibility and high conductivity, the rate capability of a super capacitor is improved, and the performance of the super capacitor can be further improved.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, and relates to a preparation method of a highly conductive flexible graphene / mesoporous graphitized carbon composite film electrode. . Background technique [0002] Supercapacitor is a new type of energy storage device developed in the 1970s–1980s between secondary batteries and traditional capacitors, because it can provide higher energy density than physical capacitors and higher power density than batteries Has a long cycle life. [0003] In earlier studies, the geometry of supercapacitors was relatively simple. Today, with the increasing development of mobile devices and wearable devices, the flexibility of supercapacitors has become increasingly important. Flexibility means that every component in the supercapacitor is flexible (electrodes and packaging, etc.). This is also the biggest difference between flexible supercapacitors and traditional supercapacitors, which can giv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/38H01G11/36H01G11/86H01M4/1393
CPCH01G11/24H01G11/36H01G11/38H01G11/86H01M4/1393Y02E60/10Y02E60/13
Inventor 林迎曦张海燕李娜秦改余家乐
Owner GUANGDONG UNIV OF TECH
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