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Rapid preparation method of lithium ion battery positive electrode material vanadium pentoxide nanosheet

A technology of vanadium pentoxide nanometer and lithium ion battery, which is applied in the direction of vanadium oxide, battery electrode, nanotechnology for materials and surface science, etc. It can solve the problems of reducing the advantages of two-dimensional nanosheet structure and achieve good rate performance and cycle stability, shorten the diffusion transport path, and increase the effect of the contact area

Inactive Publication Date: 2021-10-08
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The liquid phase exfoliation method is a rapid preparation of ultra-thin V 2 o 5 An effective method for nanosheets (2~5 nm); however, this method involves violent sonication, and the lateral dimensions of the synthesized nanosheets are often smaller than 1 μm, which somewhat reduces the structural advantages of 2D nanosheets
Clearly, developing a simple, efficient and fast method for synthesizing two-dimensional V with large lateral size 2 o 5 Nanoflakes still a big challenge

Method used

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  • Rapid preparation method of lithium ion battery positive electrode material vanadium pentoxide nanosheet
  • Rapid preparation method of lithium ion battery positive electrode material vanadium pentoxide nanosheet
  • Rapid preparation method of lithium ion battery positive electrode material vanadium pentoxide nanosheet

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Experimental program
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Embodiment 1

[0030] (1) Add 0.6 g of commercial vanadium pentoxide and 1.9 g of citric acid into 20 mL of deionized water, stir at 80°C for 0.5 h to obtain a 0.33 mol / L vanadyl citrate solution; take 3 mL of vanadyl citrate solution and 0.032g of ammonium fluoride solid (the molar ratio of vanadyl citrate to ammonium fluoride is 1:0.88) was added to 30 mL of ethylene glycol solvent, stirred at room temperature for 0.5h, and then transferred to an autoclave for 200 React at ℃ for 12 hours. After natural cooling, solid-liquid separation, washing and drying with ethanol, dark green powder is obtained, which is the VO organic ligand precursor;

[0031] (2) The VO organic ligand precursor was heat-treated in the air at a rate of 4° / min to 400°C for 4 hours. After natural cooling, the product was collected to obtain a two-dimensional large-area V 2 o 5 Nanosheets.

[0032] (3) Preparation of lithium-ion battery electrode pole pieces for testing: the two-dimensional large-area V 2 o 5 Nano fl...

Embodiment 2

[0040] (1) Add 1.2 g of commercial vanadium pentoxide and 3.8 g of citric acid into 40 mL of deionized water, stir at 80°C for 0.5 h to obtain a 0.33 mol / L vanadyl citrate solution; take 6 mL of vanadyl citrate solution and 0.073g of ammonium fluoride solid (the molar ratio of vanadyl citrate and ammonium fluoride is 1:1) was added to 60 mL of ethylene glycol solvent, stirred at room temperature for 0.5h, then transferred to a high-pressure reactor for 200 React at ℃ for 12 hours. After natural cooling, solid-liquid separation, washing and drying with ethanol, dark green powder is obtained, which is the VO organic ligand precursor;

[0041] (2) Heat the VO organic ligand precursor in the air at a heating rate of 1 °C / min to 350 °C for 1 h. After natural cooling, collect the product to obtain a two-dimensional large-area V 2 o 5 Nanosheets.

[0042] (3) Preparation of lithium-ion battery electrode pole pieces for testing: the two-dimensional large-area V 2 o 5 Nano flake ac...

Embodiment 3

[0046] (1) Add 2.4 g of commercial vanadium pentoxide and 7.6 g of citric acid into 80 mL of deionized water, stir at 80°C for 0.5 h to obtain a 0.33 mol / L vanadyl citrate solution; take 12 mL of vanadyl citrate solution and 0.146g of ammonium fluoride solid (the molar ratio of vanadyl citrate and ammonium fluoride is 1:1) was added to 120 mL of ethylene glycol solvent, stirred at room temperature for 0.5h, and then transferred to an autoclave for 200 React at ℃ for 12 hours. After natural cooling, solid-liquid separation, washing and drying with ethanol, dark green powder is obtained, which is the VO organic ligand precursor;

[0047] (2) The VO organic ligand precursor was heat-treated in air at a rate of 4°C / min to 400°C for 4 hours. After natural cooling, the product was collected to obtain a two-dimensional large-area V 2 o 5 Nanosheets.

[0048] (3) Preparation of lithium-ion battery electrode pole pieces for testing: the two-dimensional large-area V 2 o 5 Nano flake...

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Abstract

The invention discloses a rapid preparation method of a lithium ion battery positive electrode material two-dimensional large-area vanadium pentoxide nanosheet. A solvothermal and oxidation treatment two-step method is adopted for synthesis, firstly, ammonium fluoride serves as a structure-directing agent, vanadyl citrate serves as a solute, a two-dimensional flaky VO organic ligand precursor is prepared through the solvothermal method, then the precursor is subjected to low-temperature oxidation heat treatment, and the large-area V2O5 nanosheet can be synthesized. The thickness of the prepared two-dimensional V2O5 nanosheet is about 20 nm, the transverse size exceeds 5 microns, the surface is rough and porous, and the specific surface area is large; particularly, the time consumed by the technological process is not more than 24 hours. When the material is used as a positive electrode of a lithium ion battery, the porous flaky V2O5 increases the contact area of an electrolyte and effectively shortens the diffusion transmission path of ions, so that relatively good rate capability and cycling stability are shown. The preparation process is quick, efficient, simple and easy to operate, and the preparation method of the two-dimensional V2O5 is enriched and expanded.

Description

technical field [0001] The invention belongs to the field of preparation and application of metal oxide micro-nano materials, and specifically relates to a rapid preparation method of vanadium pentoxide nanosheets, which is mainly used in the field of rechargeable secondary batteries, especially in the technical direction of lithium-ion batteries. Background technique [0002] Vanadium pentoxide (V 2 o 5 ) has significant advantages such as abundant resources, low price, excellent safety, and easy preparation, and is considered to be a cathode material for lithium-ion batteries with great application potential. In particular, V 2 o 5 The theoretical specific capacity of storing two lithium ions is as high as 294 mAh g -1 , significantly higher than that of currently widely used cathode materials such as LiFePO 4 (170mAh g -1 ), LiMn 2 o 4 (148 mAh g -1 ) and LiCoO 2 (140mAh g -1 ). However, V 2 o 5 Low electron / ion conductivity, sluggish electrochemical reactio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M10/0525B82Y30/00C01G31/02
CPCH01M4/483H01M10/0525B82Y30/00C01G31/02H01M2004/028H01M2004/021Y02E60/10
Inventor 颜波高林陶华超张露露杨学林
Owner CHINA THREE GORGES UNIV