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Three-dimensional porous graphene-vanadium disulfide composite electrode material, and preparation method and application thereof

A technology of vanadium disulfide and composite electrodes, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., and can solve problems such as poor rate performance, low cycle reversibility, and low conductivity

Active Publication Date: 2018-09-28
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

2D layered vanadium disulfide (VS 2 ) has been confirmed to be a typical member of the LTMD family, vanadium (V) is sandwiched in front of two sulfur atom (S) layers to form an S-V-S sandwich structure, and this unique structure can inherently accommodate the insertion of guest ions into the interstitial gap without produce severe structural deformation, and can ensure the rapid transport of electrons during charge and discharge, however VS 2 VS 2 Poor rate performance and low cycle reversibility

Method used

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  • Three-dimensional porous graphene-vanadium disulfide composite electrode material, and preparation method and application thereof
  • Three-dimensional porous graphene-vanadium disulfide composite electrode material, and preparation method and application thereof
  • Three-dimensional porous graphene-vanadium disulfide composite electrode material, and preparation method and application thereof

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[0032] The invention provides a method for preparing a three-dimensional porous graphene-vanadium disulfide composite electrode material described in the above technical solution, comprising the following steps:

[0033] Mixing the vanadium source solution and the sulfur source to obtain a mixed solution;

[0034] The mixed solution, the porous graphene oxide and the surfactant are uniformly mixed, and hydrothermally reacted to obtain a three-dimensional porous graphene-vanadium disulfide composite electrode material.

[0035] The invention mixes the vanadium source solution and the sulfur source to obtain a mixed solution. In the present invention, the vanadium source solution is preferably prepared according to the following method:

[0036] The vanadium source and the solvent are mixed and stirred to obtain a vanadium source solution.

[0037] In the present invention, the vanadium source is preferably selected from one or more of ammonium metavanadate, sodium vanadate an...

Embodiment 1

[0054] Preparation of porous graphene oxide:

[0055] Take 44mg of graphene oxide to be treated, add 22mL of deionized water, put it into a 300W ultrasonic machine for 2 hours, and obtain a 2mg / mL graphene oxide dispersion, then add it to a three-necked flask and place it in a water bath, and adjust the temperature to room temperature Measure 4mL of 30% hydrogen peroxide with a graduated cylinder, and slowly add it into the above-mentioned three-necked flask with a peristaltic pump. After the dropwise addition is completed, raise the temperature of the water bath to 95-100°C, and the holding time is 2h. In the above process, the magnetic stirring of the water bath should be maintained and a condenser should be installed at the middle mouth of the three-necked flask to prevent the solvent from volatilizing due to the temperature rise of the solution. After the reaction is over, turn off the temperature control program of the water bath (keep magnetic stirring) and cool to room ...

Embodiment 2

[0065] Preparation of porous graphene oxide:

[0066] Take 44mg of graphene oxide to be treated, add 22mL of deionized water, put it into a 300W ultrasonic machine for 2 hours, and obtain a 2mg / mL graphene oxide dispersion, then add it to a three-necked flask and place it in a water bath, and adjust the temperature to room temperature Measure 4mL of 30% hydrogen peroxide with a graduated cylinder, and slowly add it into the above-mentioned three-necked flask with a peristaltic pump. After the dropwise addition is completed, raise the temperature of the water bath to 95-100°C, and the holding time is 2h. In the above process, the magnetic stirring of the water bath should be maintained and a condenser should be installed at the middle mouth of the three-necked flask to prevent the solvent from volatilizing due to the temperature rise of the solution. After the reaction is over, turn off the temperature control program of the water bath (keep magnetic stirring) and cool to room ...

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Abstract

The invention provides a three-dimensional porous graphene-vanadium disulfide composite electrode material, and a preparation method and an application thereof. The composite electrode material comprises porous graphene oxide and vanadium disulfide coated with porous graphene oxide. The composite electrode material adopts porous graphene oxide for coating vanadium disulfide, and porous graphene oxide provides more ionic channels and larger specific surface area, so that ion storage and transportation can be performed conveniently; by virtue of porous graphene oxide, electrical conductivity ofvanadium disulfide can be improved, so that the problems of volume expansion and phase change of vanadium disulfide in the charging-discharging processes can be suppressed; meanwhile, vanadium disulfide can provide pseudocapacitance, so that relatively high specific capacity and rate performance can be realized; the composite electrode material shows high capacitance characteristic in a supercapacitor; and by virtue of the three-dimensional macro body of the composite electrode material, stability of the composite material can be obviously reinforced.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a three-dimensional porous graphene-vanadium disulfide composite electrode material, its preparation method and its application. Background technique [0002] In addition to the existing serious environmental problems such as the greenhouse effect and acid rain, human beings are facing new problems such as the smog caused by the burning of fossil fuels and automobile gas emissions. Undoubtedly, it is urgent to develop alternative clean and sustainable energy technologies and launch zero-emission electric vehicles (EVs) to alleviate the growing environmental problems. Supercapacitors are widely regarded as one of the promising candidates for electric vehicles and energy storage due to their excellent performance. Of course, it is important to realize the design of reliable electrode materials with high energy / power density, long lifetime, high rate capability, etc....

Claims

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Application Information

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IPC IPC(8): H01G11/30H01G11/32H01G11/26H01G11/86
CPCH01G11/26H01G11/30H01G11/32H01G11/86Y02E60/13
Inventor 张海燕刘章明
Owner GUANGDONG UNIV OF TECH
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