Preparation method of sodium-ion battery cathode material Na3V2(PO4)3

A sodium-ion battery and positive electrode material technology, applied in the direction of battery electrodes, circuits, electrical components, etc., to achieve large specific surface area, high capacity charge and discharge, and the effect of facilitating transmission

Active Publication Date: 2015-11-25
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

At present, the traditional solid-phase method is mainly used to prepare the positive electrode material Na for sodium ion batteries. 3 V 2 (PO 4 ) 3 , and the electrochemical properties such as the voltage of the sodium-ion battery cathode material prepared by this method need to be improved, therefore, it is of great significance to find a preparation method of a sodium-ion battery cathode material that can improve the electrochemical performance

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  • Preparation method of sodium-ion battery cathode material Na3V2(PO4)3
  • Preparation method of sodium-ion battery cathode material Na3V2(PO4)3
  • Preparation method of sodium-ion battery cathode material Na3V2(PO4)3

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preparation example Construction

[0024] The invention provides a sodium ion battery cathode material Na 3 V 2 (PO 4 ) 3 The preparation method of the method includes the following steps:

[0025] (1) Mix sodium salt, vanadium salt, phosphate, complexing agent, polymer compound and solvent to obtain Na 3 V 2 (PO 4 ) 3 Spinning solution

[0026] (2) Put Na 3 V 2 (PO 4 ) 3 Electrospinning the spinning solution to obtain Na 3 V 2 (PO 4 ) 3 Spinning precursor;

[0027] (3) Collect Na 3 V 2 (PO 4 ) 3 Spinning precursor, in an inert atmosphere for Na 3 V 2 (PO 4 ) 3 The spinning precursor is heat-treated, and the cathode material Na for sodium ion battery is obtained after cooling. 3 V 2 (PO 4 ) 3 .

[0028] In the method of the present invention, there are no special requirements for sodium salt, vanadium salt, phosphate, complexing agent, polymer compound and solvent, which can be various sodium salts, vanadium salts, phosphates, complexing agents, Polymer compounds and solvents. In order to improve the prepared sodium i...

Embodiment 1

[0046] This embodiment is used to illustrate the Na ion battery cathode material of the present invention 3 V 2 (PO 4 ) 3 The preparation method.

[0047] According to the quantity ratio of the substance n(Na):n(V):n(PO 4 3- ):n(citric acid)=3.2:2:3:3 Weigh 0.64g sodium hydroxide, 1.1698g ammonium metavanadate, 1.7254g ammonium dihydrogen phosphate and 2.8821g citric acid respectively, and dissolve them to 10ml and 40ml respectively , 10ml, 10ml deionized water, stirring at a stirring speed of 500rpm at 70 ℃ for 1.5h until completely dissolved. Pour the sodium hydroxide solution, the ammonium metavanadate solution, and the ammonium dihydrogen phosphate solution into the citric acid solution respectively, and stir for 1.5 hours at 80° C. at a stirring speed of 500 rpm to form a dark blue solution. Weigh 2 g of polyvinylpyrrolidone with an average molecular weight of 1,300,000 to dissolve in 20 ml of deionized water, and stir for 6 hours at a stirring speed of 500 rpm at 25° C. unt...

Embodiment 2

[0053] This embodiment is used to illustrate the Na ion battery cathode material of the present invention 3 V 2 (PO 4 ) 3 The preparation method.

[0054] Weigh 2.4176g sodium dihydrogen phosphate, 0.91g vanadium pentoxide and 0.9004g oxalic acid according to the quantity ratio of the substance n(Na):n(V):n(oxalic acid)=3.1:2:2, and dissolve them to 10ml, 40ml, 10ml deionized water, stirring at a stirring speed of 400rpm at 60℃ for 2h until completely dissolved. Pour the sodium dihydrogen phosphate solution and the vanadium pentoxide solution into the oxalic acid solution, and stir at 60° C. at a stirring speed of 400 rpm for 2 hours to form a dark blue solution. Weigh 2 g of polyethylene oxide with an average molecular weight of 600,000 to dissolve in 20 ml of deionized water, and stir for 8 hours at a stirring speed of 400 rpm at 30° C. until it is completely dissolved. Add the above dark blue solution dropwise to the completely dissolved polyethylene oxide solution, stir for ...

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Abstract

The invention discloses a preparation method of a sodium-ion battery cathode material Na3V2(PO4)3. The method comprises the following steps: (1) mixing a sodium salt, a vandic salt, phosphate, a complexing agent, a high-molecular compound and a solvent to obtain a Na3V2(PO4)3 spinning solution; (2) carrying out electrostatic spinning on the Na3V2(PO4)3 spinning solution to obtain a Na3V2(PO4)3 spinning precursor; and (3) collecting the Na3V2(PO4)3 spinning precursor, carrying out thermal treatment on the Na3V2(PO4)3 spinning precursor in an inert atmosphere and cooling the Na3V2(PO4)3 spinning precursor to obtain the sodium-ion battery cathode material Na3V2(PO4)3. According to the sodium-ion battery cathode material Na3V2(PO4)3 prepared by the method disclosed by the invention, high-capacity charging and discharging of the battery can be realized; and the cycle stability of the battery can be improved.

Description

Technical field [0001] The invention belongs to the field of chemical power sources and energy materials, and relates to a preparation method of a sodium ion battery electrode material, in particular to a sodium ion battery cathode material Na 3 V 2 (PO 4 ) 3 The preparation method. Background technique [0002] Energy is the material foundation that supports the progress of human civilization. With the rapid development of social economy, the dependence of human society on energy is continuously increasing. At present, traditional fossil energy sources such as coal, oil, and natural gas provide the main energy source for human society. The consumption of fossil energy not only makes it increasingly depleted, but also has a significant impact on the environment. Therefore, changing the existing unreasonable energy structure has become the primary problem facing the sustainable development of human society. At present, the vigorously developed wind energy, solar energy, tidal e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/10
Inventor 吴川李慧吴锋白莹吴伯荣
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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