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Porous sodium vanadium fluorophosphate composite material regulated and controlled by carbon quantum dots as well as preparation method and application of composite material

A technology of sodium vanadium fluorophosphate and carbon quantum dots, which is applied in the field of porous sodium vanadium phosphate composite materials and its preparation, and can solve the problems of full contact between unfavorable electrode materials and electrolyte solutions, low electronic conductivity of sodium vanadium fluorophosphate materials, and carbon layer Uneven distribution and other problems, to achieve the effect of inhibiting the dissolution of metal ions, inhibiting side reactions at the interface, and solving uneven coating

Active Publication Date: 2021-10-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among the many positive electrode materials for sodium ion batteries, sodium vanadium fluorophosphate, a polyanionic compound with a NASICON (sodium superionic conductor) structure, has a higher voltage platform (>3.95V) and structural and thermal stability than other electrode materials. Well, it is an ideal candidate for the cathode material of sodium-ion batteries. However, the low electronic conductivity of the sodium vanadium fluorophosphate material itself leads to its unsatisfactory rate performance, and also limits its high specific capacity. Others The study improves the electrical conductivity by adding different carbon sources for in-situ coating, thereby improving the electron transport efficiency of the material, reducing the polarization of the electrode material and the internal resistance of the battery, and then improving the structural stability, cycle performance and battery resistance of the material. Rate performance
However, particle agglomeration is prone to occur during high-temperature sintering, which is not conducive to the full contact between electrode materials and electrolyte.
In addition, the carbon layer coated on the surface of the grain is often unevenly distributed during the grain growth process, resulting in limited improvement in the electron transport efficiency of the material.

Method used

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  • Porous sodium vanadium fluorophosphate composite material regulated and controlled by carbon quantum dots as well as preparation method and application of composite material
  • Porous sodium vanadium fluorophosphate composite material regulated and controlled by carbon quantum dots as well as preparation method and application of composite material
  • Porous sodium vanadium fluorophosphate composite material regulated and controlled by carbon quantum dots as well as preparation method and application of composite material

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Experimental program
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Effect test

Embodiment 1

[0047] A preparation method of porous sodium vanadium phosphate composite material, comprising the following steps:

[0048] S1. Dissolve 0.5 mmol of vanadium pentoxide and 2 mmol of oxalic acid in 20 ml of deionized water, add dilute HCl solution or ammonia water to adjust the pH=3 to obtain a mixed solution; heat the mixed solution to 80°C at a speed of 400 rpm Stir at low temperature for 2 h, then add 1.5 mmol sodium fluoride and 1.0 mmol phosphoric acid to the mixed solution successively, continue stirring for 2 h to obtain a transparent blue solution, and cool to room temperature naturally;

[0049] S2. Add the polymer solution to the obtained blue solution, stir at a rate of 400 rpm for 2 h, place the obtained solution in a petri dish, and transfer it to an oven for aging at 100°C for 24 h to obtain a green uniform sodium vanadium phosphate precursor ; Wherein, the polymer solution is prepared by dissolving 20 mg of carbon quantum dots in 20 mL of solvent, and the solven...

Embodiment 2

[0060] A preparation method of porous sodium vanadium phosphate composite material, comprising the following steps:

[0061] S1. Dissolve 0.5 mmol of vanadium trioxide and 2 mmol of citric acid in 20 ml of deionized water, add dilute HCl solution or ammonia water to adjust pH=6 to obtain a mixed solution; heat the mixed solution to 70°C, and Stir at high speed for 2 h; then add 1.5 mmol sodium fluoride and 1.0 mmol phosphoric acid to the mixed solution in turn, continue stirring for 2 h, and cool the transparent blue solution to room temperature naturally;

[0062] S2. Add the polymer solution to the obtained blue solution, stir at a rate of 400 rpm for 2 h, place the obtained solution in a petri dish, and transfer it to an oven for aging at 100° C. for 24 h to obtain a uniform green green sodium vanadium phosphate precursor; Among them, the polymer solution is prepared by dissolving 20 mg of sulfur-doped carbon quantum dots in 20 mL of solvent, and the solvent is mixed with t...

Embodiment 3

[0065] A preparation method of porous sodium vanadium phosphate composite material, comprising the following steps:

[0066] S1. Dissolve 1.0 mmol ammonium metavanadate and 2 mmol malic acid in 20 ml deionized water, add dilute HCl solution or ammonia water to adjust pH=4 to obtain a mixed solution; raise the temperature of the mixed solution to 60°C at a rate of 300 rpm Stir for 2 h, then add 1.5 mmol of sodium carbonate, 1.0 mmol of ammonium dihydrogen phosphate and 1.0 mmol of ammonium fluoride to the solution in sequence, and continue stirring for 2 h to obtain a transparent blue solution, which is naturally cooled to room temperature;

[0067] S2. Add the polymer solution to the obtained blue solution, stir at a rate of 500 rpm for 2 h, place the obtained solution in a petri dish, and transfer it to an oven for aging at 100° C. for 36 h to obtain a uniform green green sodium vanadium phosphate precursor; Among them, the polymer solution is prepared by dissolving 20 mg of ...

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Abstract

The invention provides a porous sodium vanadium fluorophosphate composite material regulated and controlled by carbon quantum dots and a preparation method and application of the composite material. The preparation method comprises the following steps: dissolving a vanadium source and organic acid in deionized water to form a mixed solution, adjusting the pH value to 2-6, raising the temperature, and then sequentially adding a sodium source, a phosphorus source and a fluorine source; adding a polymer solution into the obtained solution, and performing aging and vacuum freeze drying to obtain a precursor; preheating the precursor, and then calcining the precursor in a tubular furnace in a non-oxidizing atmosphere; and after the calcination is finished, performing cooling to room temperature, and performing washing and drying to obtain a three-dimensional porous sodium vanadium fluorophosphate composite material. The composite material prepared by the method provided by the invention has mutually communicated honeycomb porous three-dimensional structures, has excellent electrochemical performance as a positive electrode material, and significantly improves the cycle performance and rate capability of a common positive electrode material.

Description

technical field [0001] The invention relates to the technical field of cathode material preparation, and more specifically, to a porous sodium vanadium fluorophosphate composite material regulated by carbon quantum dots, a preparation method and application thereof. Background technique [0002] Due to the intensification of traditional fossil energy consumption, the constraints of energy security and other factors, as well as the enhancement of people's concept of ecological environment protection, the sustainable development, utilization and storage of energy have been highly valued by countries all over the world. Compared with mechanical energy storage, electromagnetic energy storage and phase change energy storage, electrochemical energy storage has the characteristics of high efficiency, low cost, safety and convenience, and has developed into the current main energy storage technology. Lithium-ion battery is a battery with advantages in energy density and power densit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/455C01B32/05B82Y30/00B82Y40/00H01M4/62H01M4/58H01M4/36H01M10/054
CPCC01B25/455C01B32/05B82Y30/00B82Y40/00H01M10/054H01M4/366H01M4/58H01M4/625H01M4/628C01P2004/80C01P2006/16C01P2002/72C01P2004/03C01P2006/40H01M2004/028H01M2220/20Y02E60/10
Inventor 纪效波高金强侯红帅邹国强
Owner CENT SOUTH UNIV
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