VC/graphene composite as well as preparation method and application thereof in lithium-air battery
A technology for lithium-air batteries and composite materials, applied in the field of lithium-air battery catalytic materials, can solve the problems of few related reports, and achieve the effects of good electrical conductivity, high catalytic activity, and increased wetting contact area
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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, stir 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 material structure ...
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, stir the obtained mixed solution into 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 evenly distributed between graphene and on the surface, wherein the flake VC length (width) in 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 this method is that flake VC is evenly distributed between graphene and on the surface, wherein the flake V...
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Abstract
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