Preparation methods of graphene-carbon nanotube composite thin film and electrochemical capacitor

A carbon nanotube composite and carbon nanotube technology, which is applied in the manufacture of hybrid/electric double layer capacitors, chemical instruments and methods, graphene, etc., can solve the problem of graphene's low energy storage performance, inability to use energy storage, and graphene Avoid problems such as easy agglomeration of sheets to achieve the effects of preventing agglomeration, high energy storage capacity, and high energy storage performance

Inactive Publication Date: 2014-05-14
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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Problems solved by technology

As a two-dimensional monolayer material, graphene has a high specific surface area and high electrical conductivity. It is an ideal electrode material for electrochemical capacitors. However, graphene sheets are easy to agglomerate, resulting in many graphene sheets. The surface cannot be used for energy storage, so the energy storage performance of graphene is not high

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  • Preparation methods of graphene-carbon nanotube composite thin film and electrochemical capacitor
  • Preparation methods of graphene-carbon nanotube composite thin film and electrochemical capacitor

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preparation example Construction

[0034] see figure 1 , the preparation method of the graphene-carbon nanotube composite film of an embodiment comprises the following steps:

[0035] S101, oxidize the graphite to obtain graphite oxide.

[0036] The specific steps are: add graphite to the mixed solution of concentrated sulfuric acid and concentrated nitric acid, stir in an ice-water mixing bath while keeping the temperature at about 0°C; then slowly add potassium permanganate to the mixed solution In the process, because potassium permanganate has strong oxidizing properties under acidic conditions, graphite can be oxidized; then the mixed solution is heated to 85°C for reaction and kept for 30 minutes. During the heat preservation process, graphite can be further oxidized ; Add deionized water, continue to maintain 85 ° C temperature for 30 minutes; then add hydrogen peroxide to the mixed solution, remove excessive potassium permanganate, obtain graphite oxide solution; graphite oxide solution is suction filt...

Embodiment 1

[0057] (1) Weigh 1 g of graphite with a purity of 99.5%, add it to a mixed solution consisting of 90 mL of concentrated sulfuric acid with a mass fraction of 98% and 25 mL of concentrated nitric acid with a mass fraction of 65%, and place the mixture in an ice-water mixing bath environment Stir for 20 minutes; then slowly add 6 g of potassium permanganate to the mixture, stir for 1 hour, heat the mixture to 85° C. and keep it for 30 minutes; add 92 mL of deionized water and continue to keep it at 85° C. for 30 minutes; Add 10mL of hydrogen peroxide solution with a mass fraction of 30%, and stir for 10 minutes; filter the mixture with suction, and then wash the solid matter with 100mL dilute hydrochloric acid and 150mL deionized water successively, washing three times in total, and finally the solid matter C dried in a vacuum oven for 12 hours to obtain graphite oxide.

[0058] (2) Add the graphite oxide prepared in (1) into deionized water, and use an ultrasonic cleaner to son...

Embodiment 2

[0063] (1) Weigh 5 g of graphite with a purity of 99.5%, add it to a mixed solution consisting of 475 mL of concentrated sulfuric acid with a mass fraction of 98% and 120 mL of concentrated nitric acid with a mass fraction of 65%, and place the mixture in an ice-water mixing bath environment Stir for 20 minutes; then slowly add 20 g of potassium permanganate to the mixture, stir for 1 hour, heat the mixture to 85° C. and keep it for 30 minutes; add 92 mL of deionized water and continue to keep it at 85° C. for 30 minutes; Add 30mL of hydrogen peroxide solution with a mass fraction of 30%, and stir for 10 minutes; filter the mixture with suction, and then wash the solid matter with 300mL dilute hydrochloric acid and 450mL deionized water successively, washing three times in total, and finally C dried in a vacuum oven for 12 hours to obtain graphite oxide.

[0064] (2) Add the graphite oxide prepared in (1) into deionized water, and use an ultrasonic cleaning machine with a powe...

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Abstract

A preparation method of a graphene-carbon nanotube composite thin film comprises the following steps: oxidating graphite to obtain graphite oxide; dispersing the graphite oxide in deionized water, and carrying out ultrasonic treatment for 1 hour to 2 hours to obtain a graphite oxide dispersion liquid with the concentration of 0.5 g / L to 1.0 g / L; dispersing carbon nanotubes in ethanol, and carrying out ultrasonic treatment for 3 hours to 6 hours to obtain a carbon nanotube dispersion liquid with the concentration of 0.2 g / L to 1 g / L; after mixing the graphite oxide dispersion liquid and the carbon nanotube dispersion liquid according to a volume ratio of 1:1 to 1:2, carrying out ultrasonic treatment for 5 hours to 8 hours to obtain a mixed liquid, removing the deionized water and the ethanol, and thus obtaining a graphene oxide-carbon nanotube thin film; and placing the graphene oxide-carbon nanotube thin film in an inert gas atmosphere, heating up to 700 DEG C to 900 DEG C, holding for 0.5 hour to 2 hours, cooling to the room temperature, and thus obtaining the graphene-carbon nanotube composite thin film having higher energy storage performance. The invention also provides a preparing method of an electrochemical capacitor.

Description

technical field [0001] The invention relates to the field of graphene composite materials, in particular to a preparation method of a graphene-carbon nanotube composite film and a preparation method of an electrochemical capacitor using the graphene-carbon nanotube composite film. Background technique [0002] As a new type of energy storage device, electrochemical capacitor is another energy storage device with great application potential and development value after lithium-ion batteries due to its fast charge and discharge rate, high power density, and long cycle life. However, low energy density is a key factor restricting the development and application of supercapacitors, and exploring how to increase the energy density of supercapacitors is the focus of current research in this field. [0003] According to the calculation formula of energy density E=1 / 2CV 2 , improving the energy density mainly starts from two aspects, one is to increase the voltage window of the elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B31/02H01G11/84C01B32/174C01B32/184C01B32/192
CPCY02E60/13
Inventor 周明杰钟辉王要兵刘大喜
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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