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Reduced graphene oxide-coated vanadium sodium phosphate microsphere nano-material and preparation method and use thereof

A technology of alkene-coated sodium vanadium phosphate and nanomaterials, applied in the field of nanomaterials and electrochemistry, can solve the problems of poor Coulomb efficiency, capacity decay, low voltage platform, etc. Effect

Inactive Publication Date: 2018-04-10
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of reduced graphene oxide-coated sodium vanadium phosphate microsphere nanomaterial and preparation method, its preparation process is simple, energy consumption is lower, and Na obtained in large quantities 3 V 2 (PO 4 ) 3 @rGO microsphere nanomaterial has good electrochemical performance, which solves the shortcomings of vanadium-based zinc-ion battery cathode materials such as low voltage platform, poor Coulombic efficiency, and rapid capacity decay.

Method used

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  • Reduced graphene oxide-coated vanadium sodium phosphate microsphere nano-material and preparation method and use thereof
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  • Reduced graphene oxide-coated vanadium sodium phosphate microsphere nano-material and preparation method and use thereof

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Experimental program
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Embodiment 1

[0030] Na 3 V 2 (PO 4 ) 3 @rGO microspheres and Na 3 V 2 (PO 4 ) 3The preparation method of @C microsphere nanomaterial, it comprises the steps:

[0031] 1) Add 2mmol of vanadium pentoxide powder, 3mmol of sodium carbonate solid, and 6mmol of ammonium dihydrogen phosphate solid into 150mL of deionized water in turn, and stir at 70°C to dissolve completely;

[0032] 2) Add 140 mg reduced graphene oxide to the solution obtained in 1), and continue stirring for 30 min;

[0033] 3) The solution obtained in step 2) is spray-dried. The spray-drying temperature is 160° C., the circulating air flow is 90%, and the sampling pump is 5%. The resulting product is put into a tube furnace for calcination. The calcination temperature is 750° C. for 5 hours, the calcination atmosphere is argon, and the heating rate is 5°C / min; the final calcination product is Na 3 V 2 (PO 4 ) 3 @rGO microspheres;

[0034] 140mg of reduced graphene oxide in 2) is replaced by 4mmol of citric acid, ...

Embodiment 2

[0044] 1) Add 2mmol of vanadium pentoxide powder, 2mmol of sodium carbonate solid, and 6mmol of ammonium dihydrogen phosphate solid into 150mL of deionized water in turn, and stir at 70°C for 30min;

[0045] 2) Add 140 mg reduced graphene oxide to the solution obtained in 1), and continue stirring for 30 min;

[0046] 3) The solution obtained in step 2) is spray-dried. The spray-drying temperature is 160° C., the circulating air flow is 90%, and the sampling pump is 5%. The resulting product is put into a tube furnace for calcination. The calcination temperature is 750° C. for 5 hours, the calcination atmosphere is argon, and the heating rate is 5°C / min; the final calcination product is Na 3 V 2 (PO 4 ) 3 @rGO microspheres;

[0047] 140mg of reduced graphene oxide in 2) is replaced by 4mmol of citric acid, and other steps remain unchanged to obtain Na 3 V 2 (PO 4 ) 3 @C microsphere;

[0048] With the product Na of this experiment invention 3 V 2 (PO 4 ) 3 @rGO mic...

Embodiment 3

[0050] 1) Add 2 mmol of vanadium pentoxide powder, 8 mmol of sodium bicarbonate solid, and 6 mmol of ammonium dihydrogen phosphate solid into 150 mL of deionized water in sequence, and stir at 70°C for 30 min;

[0051] 2) Add 140 mg reduced graphene oxide to the solution obtained in 1), and continue stirring for 30 min;

[0052]3) The solution obtained in step 2) is spray-dried. The spray-drying temperature is 160° C., the circulating air flow is 90%, and the sampling pump is 5%. The resulting product is put into a tube furnace for calcination. The calcination temperature is 750° C. for 5 hours, the calcination atmosphere is argon, and the heating rate is 5°C / min; the final calcination product is Na 3 V 2 (PO 4 ) 3 @rGO microspheres;

[0053] 140mg of reduced graphene oxide in 2) is replaced by 4mmol of citric acid, and other steps remain unchanged to obtain Na 3 V 2 (PO 4 ) 3 @C microsphere;

[0054] With the product Na of this experiment invention 3 V 2 (PO 4 ) ...

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Abstract

The invention relates to a reduced graphene oxide-coated vanadium sodium phosphate microsphere material and a preparation method thereof. The reduced graphene oxide-coated vanadium sodium phosphate microsphere material has a chemical formula of Na3V2(PO4)3@rGO, the microsphere diameter of 1 to 4 microns, crystallinity and a lattice space of 0.372nm. The preparation method comprises 1) orderly adding sodium source, phosphorus source and vanadium source powder into deionized water and completely dissolving the materials, 2) adding reduced graphene oxide into the solution obtained in the step 1)and carrying out stirring, and 3) spray-drying the solution obtained by the step 2) and calcining the dried product. The preparation method utilizes a simple spray drying-calcination synthesis method.Through use of reduced graphene oxide, the Na3V2(PO4)3@rGO microsphere material is obtained through liquid phase synthesis. The microsphere material can be used as a zinc ion battery positive electrode material and has a high reversible capacity, good cycling stability and high rate performances.

Description

technical field [0001] The invention belongs to the field of nanomaterials and electrochemistry, and in particular relates to a reduced graphene oxide-coated sodium vanadium phosphate microsphere material and a preparation method thereof. The material can be used as a positive electrode active material of a zinc ion battery. Background technique [0002] The environment and energy crisis urgently need to be solved. People are facing important issues such as the depletion of coal and oil resources and environmental degradation. The development of renewable energy such as solar energy and wind energy has become a global trend. However, the irregularity and discontinuity of renewable energy make the development and utilization of large-scale energy storage systems the basis and core of new energy technologies. Therefore, the development of reliable and environmentally friendly energy storage systems has become the current field of energy storage. hotspots and frontiers. Electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/36
CPCH01M4/366H01M4/5825H01M4/625H01M10/36H01M2004/021Y02E60/10
Inventor 麦立强朱婷周志强周亮
Owner WUHAN UNIV OF TECH
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