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Nano vanadium oxide and preparation method thereof

A vanadium oxide and nanotechnology, which is applied in the field of oxides and preparation, can solve problems such as easy agglomeration, small size, unfavorable excellent performance, etc., and achieve the effect of scientific preparation method, increase of specific surface area, and expansion of application range

Inactive Publication Date: 2013-08-14
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both the B-phase nano-vanadium dioxide and its preparation method have shortcomings. First, the B-phase nano-vanadium dioxide is rod-shaped and small in size, which makes it easy to agglomerate, which is not conducive to the development of its excellent performance. give full play to; secondly, the preparation method can only obtain B-phase nano-vanadium dioxide, but fails to prepare nano-vanadium oxides of other structures

Method used

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  • Nano vanadium oxide and preparation method thereof
  • Nano vanadium oxide and preparation method thereof
  • Nano vanadium oxide and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The specific steps of preparation are:

[0030] Step 1. Put the vanadium pentoxide powder at 800° C. to melt and heat it for 24 minutes to obtain a vanadium pentoxide melt. Then, the vanadium pentoxide melt is immersed in a quenching medium under stirring for 12 hours, and then left to stand for 10 days to age; wherein the quenching medium is deionized water to obtain a vanadium pentoxide sol.

[0031] Step 2. Put the vanadium pentoxide sol in a closed state and hydrothermally react at 200°C for 6 days to prepare figure 1 As shown in curve 1 and approximate figure 2 a. figure 2 b and image 3 The nano vanadium pentoxide shown in a.

[0032] Or, first add polyethylene glycol to the vanadium pentoxide sol and stir for 2 hours; wherein the molar ratio between polyethylene glycol and vanadium pentoxide is 1:5, and polyethylene glycol is polyethylene glycol-6000 , Get a mixed solution. Then put the mixed solution in an airtight state, and hydrothermally react at 220°C for 0.5h ...

Embodiment 2

[0036] The specific steps of preparation are:

[0037] Step 1. Put the vanadium pentoxide powder at 830° C. to melt and heat it for 23 minutes to obtain a vanadium pentoxide melt. Then, the vanadium pentoxide melt was immersed in a quenching medium under stirring for 12.5 hours, and then allowed to stand and age for 10.5 d; wherein the quenching medium was distilled water to obtain a vanadium pentoxide sol.

[0038] Step 2. Put the vanadium pentoxide sol in a closed state and hydrothermally react at 205°C for 4.5 days to obtain figure 1 As shown in curve 1 and approximate figure 2 a. figure 2 b and image 3 The nano vanadium pentoxide shown in a.

[0039] Or, first add polyethylene glycol to the vanadium pentoxide sol and stir for 2.5 hours; wherein the molar ratio between polyethylene glycol and vanadium pentoxide is 1:12, and polyethylene glycol is polyethylene glycol- 6000, to obtain a mixed solution. Then put the mixed solution in a closed state, hydrothermally react at 230℃ ...

Embodiment 3

[0041] The specific steps of preparation are:

[0042] Step 1. Put the vanadium pentoxide powder at 850° C. to melt and heat it for 22 minutes to obtain a vanadium pentoxide melt. Then, the vanadium pentoxide melt was immersed in the quenching medium under stirring for 13 hours, and then allowed to stand and age for 11 days; where the quenching medium was deionized water, a vanadium pentoxide sol was obtained.

[0043] Step 2. Put the vanadium pentoxide sol in a sealed state, and hydrothermally react at 210°C for 3 days to obtain figure 1 As shown in curve 1 in figure 2 a. figure 2 b and image 3 The nano vanadium pentoxide shown in a.

[0044] Or, first add polyethylene glycol to the vanadium pentoxide sol and stir for 3 hours; wherein the molar ratio between polyethylene glycol and vanadium pentoxide is 1:18, and polyethylene glycol is polyethylene glycol-6000 , Get a mixed solution. Then put the mixed solution in a closed state, hydrothermally react at 240℃ for 11h, or 48h, or...

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Abstract

The invention discloses a nano vanadium oxide and a preparation method thereof. The vanadium oxide is ribbon-shaped nano vanadium pentoxide of which the length, width and thickness are respectively 1-10mm, 30-200mm and 5-40nm, or nano vanadium oxide hydrate of which the length, width and thickness are respectively no more than 1mm, 80-480nm and 10-50nm, or nano B-phase vanadium dioxide of which the length, width and thickness are respectively 130-170mu m, 180-560nm and 20-50nm, or nano A-phase vanadium dioxide of which the length, width and thickness are respectively 80-120mu m, 0.5-5mu m and 200-450nm. The method comprises the following steps: melting vanadium pentoxide powder, and immersing in a quenching medium while stirring, thus obtaining vanadium pentoxide collosol; and performing hydrothermal reaction on the vanadium pentoxide collosol in a closed state to obtain the nano vanadium pentoxide, or adding polyethyleneglycol into the vanadium pentoxide collosol, and performing hydrothermal reaction in a closed state for different time periods to respectively obtain the nano vanadium oxide hydrate or the nano B-phase vanadium dioxide or the nano A-phase vanadium dioxide. The invention can be used in lithium ion batteries and super capacitors.

Description

Technical field [0001] The invention relates to an oxide and a preparation method, in particular to a nano vanadium oxide and a preparation method thereof. Background technique [0002] Since vanadium is a typical multivalent transition metal element, it can form vanadium oxides in multiple oxidation states. Due to the difference in phase and morphology, vanadium oxide exhibits corresponding strange physical and chemical properties. V 2 O 5 , V 6 O 13 , VO 2 (B) The layered structure of vanadium oxide is very suitable for Li + Embedding and detaching, and there are V-O bonds between layers, Li + When entering and exiting it, the lattice change is small, and the electrode reversibility is good, so it has been widely concerned and applied in lithium-ion batteries and supercapacitors; M-phase vanadium dioxide (VO 2 (M)) is a phase change metal oxide, its electrical conductivity, infrared light transmittance, resistivity and reflectivity near the phase transition temperature (68°C) w...

Claims

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Application Information

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IPC IPC(8): C01G31/02B82Y40/00
Inventor 李明孔凤玉李登兵李广海
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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