High-capacity graphene-based supercapacitor electrode material and preparation method thereof

A supercapacitor, graphene-based technology, used in hybrid capacitor electrodes, hybrid/electric double-layer capacitor manufacturing, etc., can solve problems such as hindering electrolyte ions, reducing electrostatic repulsion between graphene sheets, and low specific capacity, and achieves suppression of The effect of agglomeration, increasing surface reactive sites, and improving chemical activity

Active Publication Date: 2016-10-12
DALIAN UNIV OF TECH
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  • Abstract
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Problems solved by technology

Even though graphene has a high specific surface area, in general, during the synthesis of graphene, the reduced graphene oxide will lose a large number of oxygen-containing groups, which will significantly reduce the electrostatic repulsion between graphene sheets. In addition, due to the large contact area between the graphene sheets, the large van der Waals force causes the graphene layers to easily aggregate and re-stack. This agglomeration phenomenon of graphene not only reduces the effective The surface area will also hinder the electrolyte ions from reaching the surface of the graphene material, which will eventually affect the capacitance characteristics of the material and reduce its cycle stability.
At the same time, since graphene itself has no energy band gap, this greatly limits the application of graphene in electrochemical devices.
These two disadvantages of graphene together lead to its actual specific capacity is far lower than the theoretical capacity, thus greatly reducing the electrochemical performance of supercapacitors.

Method used

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  • High-capacity graphene-based supercapacitor electrode material and preparation method thereof
  • High-capacity graphene-based supercapacitor electrode material and preparation method thereof
  • High-capacity graphene-based supercapacitor electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0021] 1. Take the improved Hummers method (Jiang G, Goledzinowski M, Comeau FJE, ZarrinH, Lui G, Lenos J, et al. Free-Standing Functionalized Graphene Oxide Solid Electrolytes in Electrochemical Gas Sensors. Advanced Functional Materials. 2016; 26 (11 ): 1729-36.) The graphene oxide synthesized was dissolved in 30mL deionized water, and dispersed uniformly to obtain a graphene oxide dispersion of 2mg / mL.

[0022] 2. Prepare 30 mL of a 1.6 mg / mL sodium dodecylbenzenesulfonate solution, and dissolve carbon nanotubes in the solution. The mass ratio of carbon nanotubes to graphene oxide is 1:3.75.

[0023] 3. Activated carbon is added in the solution of step (2), the mass ratio of activated carbon to graphene oxide is 1:2, and the above-mentioned graphene oxide dispersion is added in the solution.

[0024] 4. Place the solution obtained in step (3) in a ball mill for 3 hours.

[0025] 5. Add melamine to the solution obtained in step (4) under stirring conditions, the mass ratio ...

Embodiment 2

[0029] 1. Dissolve the graphene oxide synthesized by the improved Hummers method in 30mL deionized water and disperse evenly to obtain a 5mg / mL graphene oxide dispersion.

[0030] 2. Prepare 30 mL of 3.75 mg / mL sodium dodecyl sulfate solution, dissolve carbon nanotubes in the above solution, and the mass ratio of carbon nanotubes to graphene oxide is 1:4.

[0031] 3. Activated carbon is added in the solution of step (2), the mass ratio of activated carbon to graphene oxide is 1:3, and the above-mentioned graphene oxide dispersion is added in the solution.

[0032] 4. Place the solution obtained in step (3) in a ball mill for 3 hours.

[0033] 5. Add melamine to the solution obtained in step (4) under stirring conditions. The mass ratio of melamine to graphene oxide is 3:2. Use ultrasonic dispersion for 1h in a system containing zirconia microspheres below 20°C, and stir for 20min Afterwards, the obtained dispersion liquid was transferred into a 100mL reactor, and reacted at 1...

Embodiment 3

[0037] The graphene oxide synthesized by the improved Hummers method was dissolved in 30 mL deionized water and dispersed evenly to obtain a 3 mg / mL graphene oxide dispersion.

[0038] 2. Prepare 30 mL of 3 mg / mL sodium dodecylsulfonate solution, dissolve carbon nanotubes in the above solution, and the mass ratio of carbon nanotubes to graphene oxide is 1:3.

[0039] 3. Activated carbon is added in the solution of step (2), the mass ratio of activated carbon to graphene oxide is 1:3, and the above-mentioned graphene oxide dispersion is added in the solution.

[0040] 4. Place the solution obtained in step (3) in a ball mill for 3 hours.

[0041] 5. Add melamine to the solution obtained in step (4) under stirring conditions. The mass ratio of melamine to graphene oxide is 1.34:1. At a temperature below 20°C, use ultrasonic dispersion for 1 hour in a system containing zirconia microspheres, and stir for 20 minutes. Afterwards, the obtained dispersion liquid was transferred into...

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Abstract

The invention relates to a high-capacity graphene-based supercapacitor electrode material and a preparation method thereof, which belong to the technical field of carbon material preparation. The preparation method comprises the steps of: dispersing a graphene oxide and a surfactant in deionized water, adding carbon nano tubes and activated carbon in order, stirring materials all above evenly, placing a mixed liquor in a ball grinding machine for wet grinding to obtain the evenly dispersed mixed liquor, adding a nitrogen source melamine under the condition of stirring, carrying out further ultrasonic dispersion, and conducting working procedures such as hydrothermal treatment, washing, freeze drying and calcinations to obtain a three-dimensional nitrogen-doped graphene-based composite material. The prepared nitrogen-doped graphene-based composite material has the advantages of stable structure, excellent electrochemistry energy performance, high specific capacitance, good cycling stability and the like, is simple and efficient in synthesis method, is high in productivity and has great utilization potentiality in supercapacitor electrode materials.

Description

technical field [0001] The invention belongs to the technical field of carbon material preparation, and relates to a supercapacitor electrode material and a preparation method thereof, in particular to a high-capacity graphene-based supercapacitor electrode material and a preparation method thereof. Background technique [0002] Due to the increasing shortage of oil resources and the increasingly serious environmental pollution caused by the exhaust emissions of internal combustion engines burning oil, it is particularly urgent and important to research and develop new energy devices that can replace internal combustion engines. In this context, supercapacitors emerged at the historic moment due to their excellent performance, which can be used as traction power and starting energy for vehicles, and become one of the most promising energy storage devices. Among the electrode materials, carbon-based materials such as graphene and carbon nanotubes are considered to be one of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/32H01G11/36H01G11/86
CPCY02E60/13H01G11/32H01G11/36H01G11/86
Inventor 谭振权刘子昂
Owner DALIAN UNIV OF TECH
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