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Sodium vanadium pyrophosphate/carbon composite positive electrode material, and preparation and application thereof

A composite cathode material, sodium vanadium pyrophosphate technology, applied in nanotechnology for materials and surface science, battery electrodes, electrical components, etc., can solve the problems of low electronic conductivity, large capacity attenuation, etc., to achieve good repeatability , the effect of low cost and good rate performance

Inactive Publication Date: 2017-08-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Polyanionic compounds mainly include transition metal (pyro) phosphate, fluorophosphate, etc.; phosphate compounds often exist in the fast ion conductor type or olivine structure, and contain large ion channels and three-dimensional open structural skeletons; Moreover, the framework structure of transition metal phosphate is relatively stable, and it has good cycle stability and high safety performance in the process of charging and discharging when used in the positive electrode. Large capacity attenuation

Method used

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  • Sodium vanadium pyrophosphate/carbon composite positive electrode material, and preparation and application thereof
  • Sodium vanadium pyrophosphate/carbon composite positive electrode material, and preparation and application thereof

Examples

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Effect test

Embodiment 1

[0084] First weigh 3.5g of aniline (0.045mol), 2g of vanadium pentoxide (0.02mol V) and dissolve in a mixed solution of 100ml of deionized water and ethanol, stir to form a uniform solution, then add 1g of sodium persulfate (0.0042mol) , pour the aqueous solution into a polytetrafluoroethylene reactor, then put the polytetrafluoroethylene reactor into a stainless steel hydrothermal kettle and seal it, and finally place the stainless steel hydrothermal kettle in a homogeneous reactor , hydrothermal reaction was carried out at 180°C for 10 hours. Centrifuge the reacted solution, then place it in an oven at 70°C for drying; take 5 g (0.06 mol) of anhydrous sodium acetate, 5 g (0.043 mol) of ammonium dihydrogen phosphate and the above dried hydrothermal product and ball mill for 10 h at a speed of 300 rad / min. The ball-milled product was sintered in a tube furnace at 600°C for 10 h in an argon atmosphere, washed three times with deionized water, washed twice with alcohol, and dr...

Embodiment 2

[0088]First weigh 3.5g of aniline (0.045mol), 2g of vanadium pentoxide (0.02mol V) and dissolve in a mixed solution of 100ml deionized water and ethanol, stir to form a uniform solution, then add 0.1g of hydrogen peroxide (0.003mol ), the aqueous solution is poured into a polytetrafluoroethylene reactor, then the polytetrafluoroethylene reactor is put into a stainless steel hydrothermal kettle and sealed, and finally the stainless steel hydrothermal kettle is placed in a homogeneous reactor , hydrothermal reaction was carried out at 180°C for 10 hours. Centrifuge the reacted solution, then place it in an oven at 70°C for drying; take 5 g (0.06 mol) of anhydrous sodium acetate, 5 g (0.043 mol) of ammonium dihydrogen phosphate and the above dried hydrothermal product and ball mill for 10 h at a speed of 300 rad / min. The ball-milled product was sintered in a tube furnace at 600°C for 10 hours in an argon atmosphere, washed three times with deionized water, washed twice with alc...

Embodiment 3

[0091] First weigh 3.5g of aniline (0.045mol), 2g of vanadium pentoxide (0.02mol V) and dissolve in a mixed solution of 100ml deionized water and ethanol, stir to form a uniform solution, then add 0.05g of hydrogen peroxide (0.0015mol ), the aqueous solution is poured into a polytetrafluoroethylene reactor, then the polytetrafluoroethylene reactor is put into a stainless steel hydrothermal kettle and sealed, and finally the stainless steel hydrothermal kettle is placed in a homogeneous reactor , hydrothermal reaction was carried out at 180°C for 10 hours. Centrifuge the reacted solution, then place it in an oven at 70°C for drying; take 5 g (0.06 mol) of anhydrous sodium acetate, 5 g (0.043 mol) of ammonium dihydrogen phosphate and the above dried hydrothermal product and ball mill for 10 h at a speed of 300 rad / min. The ball-milled product was sintered in a tube furnace at 600°C for 10 hours in an argon atmosphere, washed three times with deionized water, washed twice with ...

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Abstract

The invention discloses a preparation method for a porous sodium vanadium pyrophosphate positive electrode material of a sodium-ion battery. According to the method, nitrogen-doped carbon-coated porous sodium vanadium pyrophosphate particles with uniform particle sizes are prepared by using a hydrothermal method. The preparation method comprises the following steps: subjecting vanadium-source monomers and nitrogen-containing carbon-source monomers to a hydro-thermal reaction so as to allow a corresponding conductive polymer to grow on vanadium oxide particles in situ; subjecting a hydro-thermal product, a sodium source and a phosphorus source to ball milling so as to obtain a precursor; and successively carrying out calcining, washing and drying so as to obtain the nitrogen-doped carbon-coated porous sodium vanadium pyrophosphate particles with uniform particle sizes. Moreover, the invention also discloses the positive electrode material of the sodium-ion battery prepared by using the preparation method. The preparation method provided by the invention is simple in process and low in cost for raw materials. The prepared material is nitrogen-doped carbon-coated porous sodium vanadium pyrophosphate. The hydrothermal method is employed for in-situ generation of the conductive polymer on the surface of the vanadium source to adjust the morphology of the material and uniformity of a carbon layer; and the material is used for the sodium-ion battery and shows excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the field of sodium ion batteries, and in particular relates to sodium vanadium pyrophosphate, a positive electrode material of a sodium ion battery, and a preparation method thereof for shape control and carbon coating. Background technique [0002] The survival and development of human society are closely related to energy. The widespread application of fossil energy such as coal, oil, natural gas and other natural resources has promoted the development of the world and the progress of society. However, with the development of human beings and the progress of society, energy consumption around the world has been maintaining a positive growth. Due to the limited energy of these minerals on the earth, the energy crisis has become the theme of the new century. To solve this problem, large-scale energy storage technology has become an important research field. [0003] Among many energy storage technologies, secondary batteries...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/054B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/5825H01M4/583H01M4/625H01M10/054Y02E60/10
Inventor 张治安肖志伟赖延清尚国志李煌旭陈晓彬张凯李劼
Owner CENT SOUTH UNIV
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