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Nitrogen-doped carbon-coated vanadium nitride electrode material as well as preparation method and application thereof

An electrode material, nitrogen-doped carbon technology, applied in battery electrodes, nanotechnology for materials and surface science, circuits, etc., can solve the cumbersome preparation method of porous carbon matrix, unfavorable lithium-sulfur battery charge and discharge performance, can not meet To meet the actual requirements and other issues, to achieve the effect of environmental protection and safety in the preparation process, excellent electrochemical performance, and inhibition of dissolution

Active Publication Date: 2017-10-17
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, Chinese patent document CN104466183A discloses a polypyrrole lithium-sulfur battery cathode material and its preparation method. The polypyrrole film is compounded with elemental sulfur; the preparation method is to use the aqueous solution containing dopant and pyrrole monomer as the electrolyte, and adopt the electrochemical three-electrode method to prepare the polypyrrole film, and the polypyrrole film is melted with elemental sulfur under vacuum conditions Compounding, that is, the method is simple and easy to operate, and the obtained positive electrode material can be used to prepare lithium-sulfur batteries; but the polypyrrole in this material has poor conductivity, which cannot improve the problem of poor sulfur conductivity. Poor electrical properties of cathode materials used in lithium-sulfur batteries
Another example is the Chinese patent document CN 105161722A, which discloses a porous carbon nanofiber membrane for lithium-sulfur battery cathode materials and its preparation method. The preparation method includes precursor fiber preparation, low-temperature pretreatment and high-temperature carbonization treatment; the porous carbon nanofiber membrane of the invention It has continuous through holes and super large specific surface area, and can be used in lithium-sulfur batteries after being filled with elemental sulfur. In addition, it can also be widely used in supercapacitors, adsorption and other fields; but the confinement effect of carbon materials in the materials prepared by the invention , will cause a large amount of sulfur to dissolve, resulting in the loss of sulfur, making its electrical properties poor, and the preparation process requires a higher temperature heat treatment, the cost is higher
[0004] In the prior art, carbon and its porous materials are used as the carrier material of sulfur in lithium-sulfur batteries. Due to the confinement effect of general carbon materials, a large amount of sulfur will be dissolved out, resulting in the loss of sulfur, which is not conducive to the development of lithium-sulfur batteries. Charge and discharge performance, and the preparation method of porous carbon matrix is ​​cumbersome and costly, which cannot meet the actual requirements

Method used

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  • Nitrogen-doped carbon-coated vanadium nitride electrode material as well as preparation method and application thereof
  • Nitrogen-doped carbon-coated vanadium nitride electrode material as well as preparation method and application thereof
  • Nitrogen-doped carbon-coated vanadium nitride electrode material as well as preparation method and application thereof

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Embodiment 1

[0054] A nitrogen-doped carbon-coated vanadium nitride electrode material, the microscopic morphology of the electrode material is: the surface of the vanadium nitride nanowire is covered with nitrogen-doped carbon material; the average diameter of the vanadium nitride nanowire is 40nm, the average length is 1.5μm, and the average thickness of the nitrogen-doped carbon layer is 10nm;

[0055] The mass content of vanadium nitride in the electrode material is 75.9%, and the mass content of carbon is 24.1%.

[0056] The preparation method of the above-mentioned nitrogen-doped carbon-coated vanadium nitride electrode material includes the following steps:

[0057] (1) Dissolve 0.364g of vanadium pentoxide in 30ml of deionized water, add 5ml of aqueous hydrogen peroxide solution with a mass concentration of 30%, and stir at room temperature for 2 hours to obtain a mixed solution; hydrothermally react at 205°C for 4 days; , deionized water and absolute ethanol were alternately wash...

Embodiment 2

[0062] A preparation method of a nitrogen-doped carbon-coated vanadium nitride electrode material, the preparation steps are as described in Example 1, the difference is that the addition of pyrrole monomer in step (2) is 60 μL; the addition mass concentration is 1.3% The aqueous solution of ammonium persulfate 15mL, others are consistent with embodiment 1.

Embodiment 3

[0064] A method for preparing a nitrogen-doped carbon-coated vanadium nitride electrode material, comprising the following steps:

[0065] (1) Dissolve 0.364g of vanadium pentoxide in 30ml of deionized water, add 5ml of aqueous hydrogen peroxide solution with a mass concentration of 30%, and stir at room temperature for 2 hours to obtain a mixed solution; hydrothermally react at 200°C for 3 days; centrifuge , deionized water and absolute ethanol were washed alternately three times, and dried at 70°C for 4 hours to obtain a vanadium pentoxide nanowire precursor;

[0066] (2) Dissolve 0.4 g of sodium dodecylsulfonate in 50 mL of deionized water, add 0.1 g of the vanadium pentoxide nanowire precursor obtained in step (1) and 80 μL of pyrrole monomer, mix well and disperse evenly, and Stir at 0°C for 1 hour to obtain a reaction solution; under stirring conditions, add 10 mL of an aqueous solution of ammonium persulfate with a mass concentration of 2.6%, and react at 0°C for 5 hour...

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Abstract

The invention relates to a nitrogen-doped carbon-coated vanadium nitride electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, preparing a vanadium pentoxide nanowire precursor from vanadium pentoxide as a main raw material; by taking a pyrrole monomer as a main raw material, coating the surface of the vanadium pentoxide nanowire precursor with polypyrrole; finally performing calcining, thereby obtaining the electrode material. The preparation method is simple, high in repeatability and relatively low in equipment and chemical requirement; the prepared electrode material can be not only applied to a lithium-sulfur battery anode material, but also used as a lithium ion battery cathode material, can be compounded with graphene and is excellent in electrochemical property.

Description

technical field [0001] The invention relates to a nitrogen-doped carbon-coated vanadium nitride electrode material and a preparation method and application thereof, belonging to the technical field of lithium-ion batteries. Background technique [0002] With the increasing demand for energy, lithium-ion batteries, as a clean energy storage device, have been widely used in modern society. At present, commercial lithium-ion batteries have low energy density and cannot meet the requirements of high-power electrical appliances. Therefore, the development of new lithium-ion batteries with high specific capacity has become the key to solving the problem. Lithium-sulfur batteries have attracted extensive attention due to their unique advantages in applications due to their ultra-high energy density. In addition, sulfur is abundant in the earth, cheap and environmentally friendly. These advantages make the lithium-sulfur battery system very promising for commercial application. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/62H01M10/052H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/366H01M4/38H01M4/58H01M4/625H01M4/628H01M10/052H01M10/0525Y02E60/10
Inventor 徐立强朱琳
Owner SHANDONG UNIV
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