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A kind of vc/graphene composite material and its preparation method and application in lithium air battery

A composite material and graphene technology, which is applied in the direction of fuel cell half-cells and secondary battery-type half-cells, battery electrodes, circuits, etc., can solve the problems of few related reports and achieve good electrical conductivity and high catalytic activity , the effect of large specific surface area

Active Publication Date: 2020-08-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fe 3 C.Mo 2 C and other transition metal carbides have been beneficially studied in the field of catalysis and lithium-air batteries, but there are few reports on VC materials as lithium-air battery materials.

Method used

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  • A kind of vc/graphene composite material and its preparation method and application in lithium air battery
  • A kind of vc/graphene composite material and its preparation method and application in lithium air battery
  • A kind of vc/graphene composite material and its preparation method and application in lithium air battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043]First, 0.8 g of vanadyl acetylacetonate and 0.3 g of polyvinylpyrrolidone were weighed, added into a beaker containing 30 mL of ethanol, and stirred to form a transparent solution. Weigh 60 mg of graphene and dissolve it in 10 mL of water to form a graphene solution, add it to the above solution, and after stirring evenly, transfer the resulting mixed solution to a polytetrafluoroethylene solvothermal reaction kettle, and carry out solvothermal reaction at 160 °C. After 24 hours, the obtained precipitate was repeatedly washed with water and ethanol, and dried to obtain the precursor.

[0044] Weigh an appropriate amount of precursor, put it into a corundum porcelain boat, and place it in a vacuum tube furnace. Introduce argon gas, heat the tube furnace to 1000°C for 3 hours, and obtain the VC / graphene composite material.

[0045] The lithium-air battery VC / graphene composite material prepared in this example is assembled into a button battery with lithium, and its mater...

Embodiment 2

[0051] First, weigh 0.8 g of vanadyl acetylacetonate and 0.2 g of polyvinylpyrrolidone, add them into a beaker containing 30 mL of ethanol, and stir to form a transparent solution. Weigh 60 mg of graphene and dissolve it in 10 mL of water to form a graphene solution, add it to the above solution, and after stirring evenly, transfer the resulting mixed solution to a polytetrafluoroethylene solvothermal reaction kettle, and carry out solvothermal reaction at 180 °C. After 18 hours, the obtained precipitate was repeatedly washed with water and ethanol, and dried to obtain the precursor.

[0052] Weigh an appropriate amount of precursor, put it into a corundum porcelain boat, and place it in a vacuum tube furnace. Introduce argon gas, heat the tube furnace to 1000°C for 2 hours, and obtain the VC / graphene composite material.

[0053] The VC / graphene composite material prepared by the method is that flake VC is uniformly distributed between graphene and on the surface, wherein the...

Embodiment 3

[0056] Firstly, 0.8 g of vanadyl acetylacetonate and 0.5 g of polyvinylpyrrolidone were weighed, added into a beaker containing 20 mL of ethanol, and stirred to form a transparent solution. Weigh 40 mg of graphene and dissolve it in 20 mL of water to form a graphene solution, add it to the above solution, stir evenly, transfer the resulting mixed solution to a polytetrafluoroethylene solvothermal reaction kettle, and carry out solvothermal reaction at 180 °C. After 12 hours, the obtained precipitate was repeatedly washed with water and ethanol, and dried to obtain the precursor.

[0057] Weigh an appropriate amount of precursor, put it into a corundum porcelain boat, and place it in a vacuum tube furnace. Introduce argon gas, heat the tube furnace to 900°C for 4 hours, and obtain the VC / graphene composite material.

[0058] The VC / graphene composite material prepared by the method is that flake VC is evenly distributed between graphene and on the surface, wherein the flake VC...

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Abstract

The invention discloses a VC / graphene composite material, a preparation method thereof and an application in a lithium-air battery. The material is composed of flaky VC uniformly loaded on graphene; its preparation method is to dissolve and disperse vanadium salt and graphene in an alcohol-water mixed solvent under the action of a surfactant, and obtain a precursor by a solvothermal method; the precursor The body is placed in a protective atmosphere and heat-treated at a high temperature to obtain a VC / graphene composite material with good electrical conductivity, large specific surface area and high catalytic activity. It has a low overpotential when used as a catalyst material for lithium-air batteries. It has high specific capacity, excellent cycle performance, simple preparation method and low cost, and has good application prospect.

Description

technical field [0001] The invention relates to a lithium-air battery catalytic material, in particular to a VC / graphene composite material and a preparation method thereof, and the application of the VC / graphene composite material as a lithium-air battery cathode catalytic material, belonging to the field of lithium-air batteries. Background technique [0002] Lithium-air battery is one of the attractive high-energy-density secondary battery systems, with a theoretical energy density as high as 11700Wh kg -1 , and the energy density of gasoline-oxygen system (13000Wh kg -1 )quite. However, in the practical application process, lithium-air batteries are faced with problems such as severe polarization during charging and discharging, poor power performance, and insufficient cycle performance, which are difficult to overcome. Catalyst materials are an important part of lithium-air batteries, which can effectively promote the kinetics of lithium-air battery electrode reaction...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M12/08
CPCH01M4/9083H01M12/08Y02E60/10
Inventor 张治安宋俊肖吕晓军赖延清焦一峰李煌旭李天伟
Owner CENT SOUTH UNIV
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