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Acicular nanowires assembled into nanosheets of aqueous v 2 o 5 Xerogel and its preparation method and application

A nanosheet and nanowire technology, applied in the fields of nanomaterials and electrochemistry, to achieve the effects of strong operability, high rate performance, simple and economical process

Active Publication Date: 2017-01-18
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Vanadium oxide has been widely studied as a cathode material for lithium-ion batteries, but it is still rarely reported for sodium-ion batteries. A simple, convenient, and low-cost method is used to synthesize high-performance needle-like nanowires assembled into nanosheets V 2 o 5 It will be of great significance that xerogel can be used in both lithium-ion batteries and sodium-ion batteries

Method used

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  • Acicular nanowires assembled into nanosheets of aqueous v <sub>2</sub> o <sub>5</sub> Xerogel and its preparation method and application
  • Acicular nanowires assembled into nanosheets of aqueous v <sub>2</sub> o <sub>5</sub> Xerogel and its preparation method and application
  • Acicular nanowires assembled into nanosheets of aqueous v <sub>2</sub> o <sub>5</sub> Xerogel and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0029] Needle-like nanowires assembled into nanosheets of V 2 o 5 The preparation method of xerogel, it comprises the steps:

[0030] 1) Weigh V 2 o 5Put the powder in a crucible, then put the crucible into a muffle furnace and heat it to 800°C, keep it warm for 10-30 minutes, and get V 2 o 5 molten liquid;

[0031] 2) the V obtained in step 1) 2 o 5 Immediately pour the molten liquid into deionized water at 80-100°C for quenching, keep magnetic stirring to obtain a suspension, keep stirring and keep warm for 24-36 hours, after cooling, filter it several times and let it stand for 5-7 days to obtain a concentration of 0.055mol / L V 2 o 5 Sol;

[0032] 3) The V obtained in step 2) 2 o 5 The sol is placed in a plastic container, poured into liquid nitrogen and quenched, so that the sol is completely frozen;

[0033] 4) Quickly transfer the frozen sol in step 3) to a freeze dryer, and vacuum-dry for 48 hours at a cold trap temperature of -60°C and a vacuum degree of 5...

Embodiment 2

[0039] Needle-like nanowires assembled into nanosheets of V 2 o 5 The preparation method of xerogel, it comprises the steps:

[0040] 1) Weigh V 2 o 5 Put the powder in a crucible, then put the crucible into a muffle furnace and heat it to 800°C, keep it warm for 10-30 minutes, and get V 2 o 5 molten liquid;

[0041] 2) the V obtained in step 1) 2 o 5 Immediately pour the molten liquid into deionized water at 80-100°C for quenching, keep magnetic stirring to obtain a suspension, keep stirring and keep warm for 24-36 hours, after cooling, filter it several times and let it stand for 5-7 days to obtain a concentration of 0.085mol / L V 2 o 5 Sol;

[0042] 3) The V obtained in step 2) 2 o 5 The sol is placed in a plastic container, poured into liquid nitrogen for quenching treatment, and the sol is completely frozen;

[0043] 4) Quickly transfer the frozen sol in step 3) to a freeze dryer, and vacuum-dry for 72 hours at a cold trap temperature of -40°C and a vacuum deg...

Embodiment 3

[0047] Needle-like nanowires assembled into nanosheets of V 2 o 5 The preparation method of xerogel, it comprises the steps:

[0048] 1) Weigh V 2 o 5 Put the powder in a crucible, then put the crucible into a muffle furnace and heat it to 800°C, keep it warm for 10-30 minutes, and get V 2 o 5 molten liquid;

[0049] 2) the V obtained in step 1) 2 o 5 Immediately pour the molten liquid into deionized water at 80-100°C for quenching, keep magnetic stirring to obtain a suspension, keep stirring and keep warm for 24-36 hours, after cooling, filter it several times and let it stand for 5-7 days to obtain a concentration of 0.085mol / L V 2 o 5 Sol;

[0050] 3) The V obtained in step 2) 2 o 5 The sol is placed in a plastic container, poured into liquid nitrogen for quenching treatment, and the sol is completely frozen;

[0051] 4) Quickly transfer the frozen sol in step 3) to a freeze dryer, and vacuum-dry for 72 hours at a cold trap temperature of -40°C and a vacuum deg...

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Abstract

The invention belongs to the technical field of nano materials and electrochemistry and in particular relates to nano-sheet water-containing V2O5 dry gel assembled by needle-like nanowires as well as a preparation method of the nano-sheet water-containing V2O5 dry gel. The material can be used as a positive active material for high-capacity and high-power lithium ion and sodium ion batteries; the thickness of the nano sheet is 20-30nm; the diameter of the needle-like nanowires is 2-10nm; the length of the needle-like nanowires is 50-500nm. The nano-sheet water-containing V2O5 dry gel has the beneficial effects that the nano-sheet water-containing V2O5 dry gel assembled by the needle-like nanowires is quickly synthesized by a simple and economical process. When the material is used as the positive active material for the lithium ion batteries, the nano-sheet water-containing V2O5 dry gel assembled by the needle-like nanowires has excellently high capacity and high-rate performance.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemistry, and in particular relates to a V 2 o 5 The dry gel and a preparation method thereof, the material can be used as a high-capacity high-power lithium-ion and sodium-ion battery cathode active material. Background technique [0002] Electrochemical energy storage technology is playing an increasingly important role in our lives. Among various energy storage technologies, the rechargeable green chemical storage device - Lithium-ion battery has the advantages of high capacity and long life , are widely used in mobile electronic devices and have now been extended to electric vehicles and large-scale energy storage systems. However, the large-scale demand for lithium on the earth keeps the price of lithium rising. Sodium is widely available and inexpensive compared to lithium. At the same time, because sodium has similar physical and chemical properties to lithium, sodium-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48B82Y30/00B82Y40/00H01M10/0525
CPCB82Y30/00B82Y40/00H01M4/48H01M10/0525H01M10/054Y02E60/10
Inventor 麦立强冯威郑琪颖魏湫龙谭双双
Owner WUHAN UNIV OF TECH
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