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Tungsten-doped vanadium dioxide nanopowder and preparation method thereof

A vanadium dioxide nanometer and vanadium dioxide technology, which is applied in the field of tungsten-doped vanadium dioxide nanopowder and its preparation, can solve the problems that affect the large-scale implementation of industrialization, the process is cumbersome, and the powder is difficult to apply. Large-scale industrial implementation, simple preparation method, good dispersion effect

Active Publication Date: 2011-12-28
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, there are deficiencies in this preparation process. First, the shape of the prepared powder cannot be effectively controlled, making it difficult for the powder to be applied to certain occasions that require its shape; secondly, There are many process steps and the process is cumbersome, which affects the large-scale implementation of its industrialization; thirdly, there are many types of raw materials involved, including concentrated hydrochloric acid, which makes it difficult to reduce the production cost and easily pollutes the environment

Method used

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  • Tungsten-doped vanadium dioxide nanopowder and preparation method thereof
  • Tungsten-doped vanadium dioxide nanopowder and preparation method thereof
  • Tungsten-doped vanadium dioxide nanopowder and preparation method thereof

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Embodiment 1

[0026] The concrete steps of preparation are:

[0027] Step 1, first follow the V 0.99 W 0.01 o 2 Weigh the corresponding amount of vanadium pentoxide and ammonium tungstate, mix them and place them at 830°C to melt and keep warm for 20 minutes. Then immerse the molten body in a quenching medium and stir for 12 hours, then leave it to age for 10 days; wherein, the quenching medium is deionized water (or distilled water) to obtain a doped sol.

[0028] Step 2, first add the polyethylene glycol aqueous solution with a concentration of 23wt% into the doping sol, and stir for 8 hours; wherein, the volume ratio between the polyethylene glycol aqueous solution and the doping sol is 4:1, and the polyethylene glycol is polyethylene glycol-6000 to obtain a mixed solution. Then put the mixed solution in an airtight state, and conduct a hydrothermal reaction at 180°C for 2 days; figure 1 a. figure 2 a and figure 2 as shown in b, and as figure 1 c and image 3 The flake-like tu...

Embodiment 2

[0030] The concrete steps of preparation are:

[0031] Step 1, first follow the V 0.985 W 0.015 o 2 Weigh the corresponding amount of vanadium pentoxide and ammonium tungstate, mix them and place them at 840°C to melt and keep warm for 21 minutes. Then immerse the molten body in a quenching medium and stir for 13 hours, then leave it to age for 11 days; wherein, the quenching medium is deionized water (or distilled water) to obtain a doped sol.

[0032] Step 2, first add a polyethylene glycol aqueous solution with a concentration of 24wt% into the doping sol, and stir for 8.5 hours; wherein, the volume ratio between the polyethylene glycol aqueous solution and the doping sol is 3.8:1.3, polyethylene glycol For polyethylene glycol-6000, a mixed solution was obtained. Then the mixed solution was placed in a closed state, and hydrothermally reacted at 190°C for 3 days; figure 1 a. figure 2 a and figure 2 as shown in b, and as figure 1 c and image 3 The flake-like tung...

Embodiment 3

[0034] The concrete steps of preparation are:

[0035] Step 1, first follow the V 0.98 W 0.02 o 2 Weigh the corresponding amount of vanadium pentoxide and ammonium tungstate, mix them and place them at 850°C to melt and keep warm for 23 minutes. Then, the molten body was immersed in a quenching medium and stirred for 14 hours, and then aged for 12 days; wherein, the quenching medium was deionized water (or distilled water) to obtain a doped sol.

[0036] Step 2, first add the polyethylene glycol aqueous solution with a concentration of 25wt% into the doping sol, and stir for 9 hours; wherein, the volume ratio between the polyethylene glycol aqueous solution and the doping sol is 3.5:1.5, and the polyethylene glycol is polyethylene glycol-6000 to obtain a mixed solution. Then the mixed solution was placed in a closed state, and hydrothermally reacted at 200°C for 4 days; figure 1 a. figure 2 a and figure 2 b and / or figure 1 b. figure 2 c and figure 2 d, and as fi...

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Abstract

The invention discloses a tungsten-doped vanadium dioxide nanopowder and a preparation method for the nanopowder. The powder is flaky or conic rod-shaped tungsten-doped B-phase vanadium dioxide of which the chemical formula is V1-xWxO2; the flaky V1-xWxO2 is 1-10 nm thick, 350-450 nm wide and 3-5 mum long, and the conic tip diameter of the conic rod-shaped V1-xWxO2 is 15-25 nm, the cone length is110-150 nm, the rod diameter is 130-150 nm and the rod length is 1-2 mum; the preparation method comprises the following steps of: firstly, weighting vanadium pentoxide and ammonium tungstate according to a component ratio of the V1-xWxO2, melting the weighted vanadium pentoxide and ammonium tungstate and preserving heat for at least 20 minutes, then, dipping the molten mass in a quenching media and stirring for at least 12 hours, standing and aging for at least 10 days to obtain a doped sol, afterwards, adding polyethylene glycol aqueous solution into the doped sol, stirring for at least 8 hours to obtain mixed solution, and setting the mixed solution to be airtight for reaction for 2-6 days at the temperature of 180-220 DEG C so as to prepare the tungsten-doped B-phase vanadium dioxide powder. The tungsten-doped B-phase vanadium dioxide powder can be used as electrode material for lithium ion batteries; and after being annealed, the tungsten-doped B-phase vanadium dioxide powder canbe prepared into a phase-change metallic oxide material with wider application, namely, a tungsten-doped M-phase VO2.

Description

technical field [0001] The invention relates to a nano-powder and a preparation method thereof, in particular to a tungsten-doped vanadium dioxide nano-powder and a preparation method thereof. Background technique [0002] Vanadium dioxide (VO 2 ) mainly exists in 4 polycrystalline forms, R-phase VO 2 , M-phase VO 2 , Phase A VO 2 and B-phase VO 2 ; Among them, B-phase VO 2 is the metastable phase, with V 2 o 5 Very similar layered structure, so it also resembles V 2 o 5 , V 6 o 13 Like other vanadium oxides, it can be used as an electrode material for lithium-ion batteries. Single tungsten-doped B-phase VO 2 With superparamagnetism, it exhibits nonlinear current / voltage properties and reversible infrared light response characteristics. For tungsten-doped B-phase VO 2 Annealing treatment can obtain tungsten-doped M-phase VO 2 , while the tungsten-doped M-phase VO 2 It is a phase-change metal oxide material, which will combine with R-phase VO at the phase-chan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02B82B3/00
Inventor 李明孔凤玉张云霞李广海
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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