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Sodium vanadium fluorophosphate/graphene composite, preparation method thereof and use thereof

A technology of sodium vanadyl fluorophosphate and sodium vanadyl phosphate, which is applied in the field of sodium vanadyl fluorophosphate/graphene composite and preparation, can solve problems such as poor conductivity of sodium vanadyl fluorophosphate, and achieves favorable ionic and structural stability. , the effect of simple process

Active Publication Date: 2019-09-17
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] In view of the defects of the prior art, the object of the present invention is to provide a sodium vanadyl fluorophosphate / graphene composite electrode material and a preparation method thereof, aiming at solving the problem of poor conductivity of the existing sodium vanadyl fluorophosphate

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  • Sodium vanadium fluorophosphate/graphene composite, preparation method thereof and use thereof
  • Sodium vanadium fluorophosphate/graphene composite, preparation method thereof and use thereof
  • Sodium vanadium fluorophosphate/graphene composite, preparation method thereof and use thereof

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preparation example Construction

[0039] The second of the present invention provides a preparation method of sodium vanadyl fluorophosphate / graphene composite, comprising:

[0040] (1) graphene is dispersed in deionized water to obtain graphene oxide aqueous solution;

[0041] And the trivalent vanadium compound, phosphoric acid / phosphoric acid compound, sodium fluoride, ethanol and acetone are mixed uniformly according to the preset ratio to obtain a mixed solution;

[0042] (2) After mixing the graphene oxide aqueous solution and the mixed solution in a set ratio, they are placed in an autoclave at a temperature of 120° C. for hydrothermal reaction;

[0043] (3) The product after hydrothermal reaction in step (2) is successively washed, centrifuged and dried to obtain sodium vanadyl fluorophosphate / graphene composite (Na 3 (VOPO 4 ) 2 F).

[0044] Preferably, the mixed solution in the above step (1) is vanadium acetylacetonate, phosphoric acid, sodium fluoride, ethanol and acetone;

[0045] Preferably,...

Embodiment 1

[0055] Take 150 mg of graphene oxide and disperse it in 15 g of deionized water, and use an ultrasonic cell pulverizer to sonicate for 40 minutes to obtain a uniformly dispersed graphene oxide aqueous solution; take 359 mg of vanadium acetylacetonate, 104 μL of phosphoric acid (85%, 14.4968 moles per liter), 71.5 mg Dissolve sodium fluoride in a mixed solution of 3mL ethanol and 1mL acetone, then add 3g of the above-mentioned graphene oxide aqueous solution to the mixed solution, mix well, transfer it to a 25mL polytetrafluoroethylene reactor, and place it in a constant temperature oven at 120°C After keeping for 10 hours, the reacted samples were taken out, washed three times with ethanol and deionized water respectively, centrifuged and then dried to obtain the sodium vanadyl fluorophosphate / graphene composite.

[0056] Apply the sodium vanadyl fluorophosphate / graphene composite prepared above to electrode materials, add conductive agent acetylene black, and binder polyvinyli...

Embodiment 2

[0058] Take 150 mg of graphene oxide and disperse it in 15 g of deionized water, and use an ultrasonic cell pulverizer to sonicate for 40 minutes to obtain a uniformly dispersed graphene oxide aqueous solution; take 359 mg of vanadium acetylacetonate, 104 μL of phosphoric acid (85%, 14.4968 moles per liter), 71.5 mg Dissolve sodium fluoride in a mixed solution of 3mL ethanol and 1mL acetone, then add 4.5g of the above-mentioned graphene oxide aqueous solution to the mixed solution, mix it uniformly, transfer it to a 25mL polytetrafluoroethylene reactor, and place it in a constant temperature oven at 120 Keep at ℃ for 10 hours, take out the reacted sample, wash with ethanol and deionized water three times respectively, centrifuge and dry to obtain sodium fluorovanadyl phosphate / graphene composite.

[0059] Apply the sodium vanadyl fluorophosphate / graphene composite prepared above to electrode materials, add conductive agent acetylene black, and binder polyvinylidene fluoride at ...

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Abstract

The invention discloses a sodium vanadium fluorophosphate / graphene composite, a preparation method thereof and use thereof. The sodium vanadium fluorophosphate / graphene composite is a porous submicron sphere structure which comprises a plurality of nanosheets, and gaps are between the nanosheets. The preparation method comprises a step of dispersing graphene oxide in deionized water to obtain a graphene oxide aqueous solution, a step of uniformly mixing vanadium acetylacetonate, phosphoric acid, sodium fluoride, ethanol and acetone in a predetermined ratio to obtain a mixed solution, a step of mixing the graphene oxide aqueous solution and the mixed solution in a set ratio and then placing the graphene oxide aqueous solution and the mixed solution in an autoclave at a temperature of 120 DEG C for hydrothermal reaction, a step of sequentially washing, centrifuging and drying a hydrothermally reacted product to obtain the sodium vanadium fluorophosphate / graphene composite. Since the sodium vanadium fluorophosphate / graphene composite has good electrical conductivity and stable structure, the sodium vanadium fluorophosphate / graphene composite is suitable for being applied as a positive electrode material for a sodium-ion battery.

Description

technical field [0001] The invention belongs to the field of preparation of electrodeless materials, and more specifically relates to a sodium vanadyl fluorophosphate / graphene composite, a preparation method and an application thereof. Background technique [0002] Sustainable energy production is of great significance to the realization of sustainable development strategies. The rapid consumption of traditional fossil fuels and the increasingly serious environmental problems caused by their excessive use have further stimulated the use of renewable energy. However, in the use of renewable energy, cost-effective energy storage systems, especially large-scale energy storage systems, still have great challenges. Electrochemical energy storage systems have the advantages of good flexibility, high energy conversion efficiency, and simple maintenance. However, the insufficient supply of raw materials and the increase in cost brought about by limited lithium resources will inevit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/5825H01M4/62H01M4/625H01M10/054Y02E60/10
Inventor 李园园巴德良
Owner HUAZHONG UNIV OF SCI & TECH
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