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Accordion-shaped VS2 material and its preparation method and application

An accordion and nanosheet technology, applied in the fields of nanomaterials and electrochemistry, to achieve the effects of good long-life performance, simple process and excellent cycle performance

Active Publication Date: 2019-01-29
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By controlling the charge-discharge cut-off voltage, the VS 2 Becoming an embedded anode material with high ionic and electronic conductivity and lower voltage platform has not been reported

Method used

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  • Accordion-shaped VS2 material and its preparation method and application
  • Accordion-shaped VS2 material and its preparation method and application
  • Accordion-shaped VS2 material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Accordion VS 2 The preparation method of material, it comprises the following steps:

[0035] 1) Take a certain amount of ammonia solution and disperse it in deionized water. The concentration of ammonia in the homogeneous mixed solution is 1.7mmol mL -1 , stir until uniform;

[0036] 2) Slowly add a certain amount of polyvinylpyrrolidone (PVP K-30) to the solution obtained in step 1), stir magnetically until it is completely dissolved, and its concentration in the aqueous solution is 0.033g mL -1 ;

[0037] 3) Slowly add a certain amount of NH to the solution obtained in step 2) 4 VO3 Powder, magnetically stirred until completely dissolved, its concentration in aqueous solution is 0.067mmol mL -1 ;

[0038] 4) Slowly add an appropriate amount of thioacetamide (TAA) to the solution obtained in step 3) according to the vanadium / sulfur molar ratio of 1 / 10, and magnetically stir until completely dissolved;

[0039] 5) Transfer the solution obtained in step 4) to a po...

Embodiment 2

[0045] Accordion VS 2 The preparation method of material, it comprises the following steps:

[0046] 1) Take a certain amount of ammonia solution and disperse it in deionized water, stir until uniform, the concentration of ammonia water in the uniform mixed solution is 3.5mmol mL -1 ;

[0047] 2) Slowly add a certain amount of polyvinylpyrrolidone (PVP K-30) powder into the solution obtained in step 1), stir magnetically until it is completely dissolved, and its concentration in the aqueous solution is 0.067g mL -1 ;

[0048] 3) Slowly add a certain amount of NH to the solution obtained in step 2) 4 VO 3 Powder, magnetically stirred until completely dissolved, its concentration in aqueous solution is 0.067g mL -1 ;

[0049] 4) Slowly add an appropriate amount of thioacetamide (TAA) to the solution obtained in step 3) according to the vanadium / sulfur molar ratio of 1 / 10, and magnetically stir until completely dissolved;

[0050] 5) Transfer the solution obtained in step ...

Embodiment 3

[0055] Accordion VS 2 The preparation method of material, it comprises the following steps:

[0056] 1) Take a certain amount of ammonia solution and disperse it in deionized water, stir until uniform, the concentration of ammonia water in the uniform mixed solution is 3.5mmol mL -1 ;

[0057] 2) Slowly add a certain amount of polyvinylpyrrolidone (PVP K-30) powder into the solution obtained in step 1), stir magnetically until it is completely dissolved, and its concentration in the aqueous solution is 0.067g mL -1 ;

[0058] 3) Slowly add a certain amount of NaVO in the solution obtained in step 2) 3 Powder, magnetically stirred until completely dissolved, its concentration in aqueous solution is 0.067mmol mL -1 ;

[0059] 4) Slowly add an appropriate amount of thioacetamide (TAA) to the solution obtained in step 3) according to the vanadium / sulfur molar ratio of 1 / 15, and magnetically stir until completely dissolved;

[0060] 5) Transfer the solution obtained in step 4...

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Abstract

The invention belongs to the technical field of nanometer materials and electrochemistry and particularly relates to an accordion-shaped VS2 material as well as a preparation method and application thereof. The accordion-shaped VS2 material can be taken as an anode active material of a long-life and high-magnification sodium-ion battery and comprises a nanoparticle formed by regular stacking of a plurality of VS2 nanometer subunit nanosheets, and gaps are formed among the nanosheets to form a similar accordion-shaped stereoscopic structure; and the length of the nanoparticle is 1-1.5 microns, the width of the nanoparticle is 500nm-800nm, and the thickness of the single nanometer subunit nanosheet is 30nm-35nm. The preparation method has the beneficial effects that the accordion-shaped VS2 material is successfully synthesized by virtue of a high-temperature water method and a high-temperature sintering method; and when being used as the anode active material of an embedded sodium-ion battery, the accordion-shaped VS2 material presents excellent high magnification rate performance, cycling stability and long life and is a potential application material for the high-power and long-life sodium-ion battery.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemistry, and in particular relates to an accordion-shaped VS 2 A material and a preparation method thereof, the material can be used as a long-life, high-rate sodium-ion battery negative electrode active material. Background technique [0002] Various technical applications of energy storage, such as portable devices such as mobile phones, digital cameras, and notebook computers, electric vehicles, hybrid electric vehicles, and large-scale energy storage systems have attracted widespread attention. In order to drive these large-scale energy devices, battery materials with high energy density and high power density are urgently needed to be developed. Lithium-ion batteries, which are widely studied at present, are expensive due to the limited reserves of lithium in the earth's crust, resulting in high battery costs. Na-ion batteries have the advantages of abundant sodium resour...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/054
CPCH01M4/5815H01M10/054Y02E60/10
Inventor 安琴友孙睿敏魏湫龙麦立强
Owner WUHAN UNIV OF TECH
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