Flexible iron niobate nanowire array electrode and preparation method and application thereof

A technology of nanowire arrays and array electrodes, which is applied in the direction of active material electrodes, negative electrodes, battery electrodes, etc., can solve the problems of unsuccessful preparation of ferric niobate materials, and achieve good electron conduction, good reproducibility, The effect of shortening the diffusion path

Active Publication Date: 2020-09-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, iron niobate materials with an array structure have not been successfully prepared so far

Method used

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  • Flexible iron niobate nanowire array electrode and preparation method and application thereof
  • Flexible iron niobate nanowire array electrode and preparation method and application thereof
  • Flexible iron niobate nanowire array electrode and preparation method and application thereof

Examples

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Embodiment 1

[0030] This example shows a preparation method of a flexible iron niobate nanowire array electrode and its application in sodium ion batteries.

[0031] Proceed as follows:

[0032] (1) Place the stainless steel mesh in absolute ethanol to ultrasonically remove surface impurities and then dry it for use; (2) Mix 0.6g niobium pentachloride, 0.9g hydrofluoric acid (mass percentage concentration 40%), and 3mL deionized water , 60mL of absolute ethanol are mixed evenly and then moved to an autoclave with a polytetrafluoroethylene substrate, then place the stainless steel mesh in step (1), and cool to room temperature after reacting at 200°C for 16h; (3) put the step ( The material obtained in 2) was heated in a high-purity argon atmosphere at a rate of 5° C. / min to 700° C. for 3 hours, and then an iron niobate nanowire array electrode was obtained. figure 1 The X-ray diffraction (XRD) phase spectrum of the product is shown. It can be seen from the figure that the diffraction peak...

Embodiment 2

[0038] This example shows a preparation method of a flexible iron niobate nanowire array electrode and its application in sodium ion batteries.

[0039](1) Place the stainless steel mesh in absolute ethanol to ultrasonically remove surface impurities and dry it for use; (2) Mix 0.8g niobium pentachloride, 1.1g hydrofluoric acid (40% by mass percentage concentration), 4.0mL deionized Mix water and 80mL of absolute ethanol evenly, then move to an autoclave with a polytetrafluoroethylene substrate, place the stainless steel mesh in step (1), react at 200°C for 16h, and then cool to room temperature; (3) ( The material obtained in 2) was heated in a high-purity argon atmosphere at a rate of 5° C. / min to 700° C. for 3 hours, and then an iron niobate nanowire array electrode was obtained. Cut the obtained iron niobate material into 1×1cm 2 The electrode sheet is used as the negative electrode material of the sodium ion battery, with 1mol / L NaClO 4 / EC (ethylene carbonate) / PC (prop...

Embodiment 3

[0042] This example shows a preparation method of a flexible iron niobate nanowire array electrode and its application in sodium ion batteries.

[0043] (1) Place the stainless steel mesh in absolute ethanol to ultrasonically remove surface impurities and then dry it for use; (2) Mix 0.6g niobium pentachloride, 0.9g hydrofluoric acid (mass percentage concentration 40%), and 3mL deionized water , 60mL of absolute ethanol are mixed evenly and then moved to an autoclave with a polytetrafluoroethylene substrate, then place the stainless steel mesh in step (1), and cool to room temperature after reacting at 210°C for 18h; (3) put the step ( The material obtained in 2) was heated up to 700° C. for 3 hours at a rate of 5° C. / min in a high-purity argon atmosphere to obtain an iron niobate nanowire array material.

[0044] According to XRD analysis, the prepared material is basically consistent with the standard card (PDF#72-483). It can be seen from the SEM characterization that the ...

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Abstract

The invention relates to a flexible iron niobate nanowire array electrode and a preparation method and application thereof. The electrode is composed of a stainless steel mesh and ferric niobate nanowires growing on the stainless steel mesh, the length of each nanowire is 0.8-1 micron, the diameter of each nanowire is 30-35 nm, and the nanowires are vertically, orderly and densely distributed on the surface of a substrate in an array mode. The preparation method of the electrode comprises the following steps: uniformly mixing niobium salt, hydrofluoric acid, deionized water and absolute ethylalcohol in proportion, putting the mixture into a stainless steel net as an iron source and a substrate, and carrying out solvothermal reaction at a certain temperature; and after the reaction is finished, taking out the stainless steel mesh, washing, drying, and finally annealing in inert gas to obtain the electrode. The preparation process is simple, good in reproducibility and low in energy consumption. The nanowire array has the advantages of short ion diffusion path, the stable structure and the like, ensures that the electrode material shows good rate capability and cycle performance inthe sodium-ion battery, and has important significance for research of the flexible sodium-ion battery negative electrode material.

Description

technical field [0001] The invention belongs to the field of sodium ion batteries, and in particular relates to a flexible iron niobate nanowire array electrode, a preparation method and an application. Background technique [0002] As the most mature electrochemical energy storage system, lithium-ion batteries are widely used in energy storage devices such as various portable electronic devices, electric vehicles, and large-scale smart grids. However, factors such as insufficient lithium resources, uneven distribution, and high price limit its further application in large-scale energy storage. Sodium and lithium belong to the same main group element, and have similar physical and chemical properties and electrochemical energy storage mechanism as lithium. Moreover, sodium is abundant on the earth, evenly distributed, and the cost of raw materials is low. These advantages make sodium-ion batteries expected to replace lithium-ion batteries. in large-scale energy storage devi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/1397H01M4/136H01M10/054C01G49/00
CPCH01M4/5825H01M4/1397H01M4/136H01M10/054C01G49/00H01M2004/021H01M2004/027C01P2002/72C01P2004/03C01P2006/40C01P2004/61C01P2004/62Y02E60/10
Inventor 刘金平陈瑶董浩洋刘文燚
Owner WUHAN UNIV OF TECH
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