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Mesoporous vanadium dioxide nano strip material as well as preparation method and application thereof

A technology of vanadium dioxide nanometer and tape materials, which is applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of not having a mesoporous structure, and achieve the effects of good reproducibility, high yield, and high purity

Inactive Publication Date: 2011-05-18
LOGISTICS UNIV OF CAPF
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many synthesis methods of vanadium dioxide nanobelts, such as liquid phase reduction method, chemical vapor deposition, hydrothermal method, etc., but none of them have mesoporous structure.

Method used

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  • Mesoporous vanadium dioxide nano strip material as well as preparation method and application thereof
  • Mesoporous vanadium dioxide nano strip material as well as preparation method and application thereof
  • Mesoporous vanadium dioxide nano strip material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Accurately weigh 1 gram of vanadium pentoxide and 50 mL of 10% H by volume 2 o 2 Aqueous solution reaction prepares vanadium pentoxide sol; Then vanadium pentoxide sol, 0.1 gram of glucose and 0.1 gram of polyethylene glycol (PEG-2000) are mixed homogeneously and after ultrasonic dispersion 20 minutes, transfer the mixture to a polytetrafluoroethylene In an ethylene-lined reactor, react at a constant temperature of 180°C for 12 hours, cool, separate, wash with deionized water and cyclohexane three times each, and then vacuum dry at 90°C for 10 hours to obtain black mesoporous Vanadium dioxide nanoribbons. The XRD pattern of the product is shown in figure 1 ; SEM image see figure 2 , indicating that the morphology of the prepared product is nanobelt; nitrogen adsorption-desorption isotherm see image 3 , indicating that the product has a typical mesoporous substance absorption-solubility characteristic curve; the pore size distribution diagram is shown in Figure 4...

Embodiment 2

[0028] Electrode preparation and constant current charge and discharge test:

[0029] The mesoporous vanadium dioxide nanoribbon material prepared in Example 1 was used as the active material of the positive electrode material, and the positive electrode sheet of the battery was pressed according to the mass ratio of the active material, acetylene black and binder (PTFE): 80:15:5. The prepared electrode sheet is a disc with a diameter of 8mm, and is dried in a vacuum oven at 80°C for 12 hours; the negative electrode is a polished magnesium sheet; the electrolyte is 0.25mol / L Mg(AlBu 2 Cl 2 ) 2 / THF; the diaphragm is: celgard 2300. In a glove box filled with high-purity argon, the water content is less than 5ppm, and a simulated battery is assembled. The charge-discharge cycle performance graph when the charge-discharge current density is 50mA / g is shown in Figure 5 , the prepared product has better cycle stability and higher capacity when applied to magnesium secondary ba...

Embodiment 3

[0031] A mesoporous vanadium dioxide nanoribbon material is made by the following method:

[0032] (1) be the ratio of 1: 50 by mass ratio, be the hydrogen peroxide solution mixed reaction of 10% by volume percent concentration with vanadium pentoxide, make vanadium pentoxide sol;

[0033] (2) According to the mass ratio of 20:30:50, vanadium pentoxide sol, glucose and PEG-1000 were evenly mixed and ultrasonically dispersed for 20 minutes, and transferred to a reaction kettle with a polytetrafluoroethylene liner, React at a constant temperature of 100°C for 48 hours, cool, and centrifuge to separate the solid. The solid is washed with deionized water and cyclohexane in turn, and then vacuum-dried at 90°C for 5 hours to obtain a black pore size distribution mainly in 3-5 nm. mesoporous vanadium dioxide nanoribbons.

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Abstract

The invention discloses a mesoporous vanadium dioxide nano strip material as well as a preparation method and application thereof. The mesoporous vanadium dioxide nano strip material is prepared by using the following steps of: mixing vanadium pentoxide with hydrogen peroxide to obtain vanadium pentoxide sol; uniformly mixing and ultrasonically dispersing the vanadium pentoxide sol, glucose and polyethylene glycol and transferring to a reactor; reacting at the constant temperature of 100-240 DEG C, cooling and centrifugally separating a solid; and washing the solid sequentially with deionized water and cyclohexane; then drying in vacuum to obtain a black mesoporous vanadium dioxide nano strip with the hole diameter mainly distributed in 3-5 nano. The mesoporous vanadium dioxide nano strip disclosed in the invention is a good magnesium secondary battery anode material. The constant current charge and discharge performance research of a magnesium secondary battery formed by the anode material indicates that the circulating volume and magnification discharge performance of the material are obviously improved. The method disclosed in the invention has the advantages of mild reaction condition, simple reaction process, high yield of products, high purity and high reproducibility.

Description

technical field [0001] The invention relates to a mesoporous vanadium dioxide nanobelt material, a preparation method and an application in a secondary battery. Background technique [0002] An important factor affecting the charge-discharge rate of magnesium secondary batteries is the diffusion of magnesium ions in the material, and the diffusion coefficient and diffusion channel are closely related to the microporous structure of the material. Mesoporous materials were first successfully prepared by Mobil Corporation in 1992, which attracted widespread attention. Mesoporous materials contain very regular and well-ordered pores, approximately between 2-20 nm, and the size of the pores can be adjusted by using different assembly molecules and reaction conditions. Introducing mesoporous materials into magnesium secondary battery cathode materials has a stable structure, and the pore size can be adjusted according to needs, which will be a major breakthrough in improving the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/1391
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 司玉昌孙文军
Owner LOGISTICS UNIV OF CAPF
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