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A nanosheet flower-shaped sodium vanadium oxyphosphate electrode material and its preparation method and application

A technology of sodium vanadium oxyphosphate and electrode materials, which is applied in nanotechnology, battery electrodes, nanotechnology, etc., can solve problems such as poor electronic conductivity, and achieve stable electrode performance, good electrochemical performance, and uniform size.

Active Publication Date: 2022-05-31
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to aim at the defect of poor intrinsic electron conductivity of sodium vanadium oxyphosphate, to provide a nano-sheet flower-shaped sodium vanadium oxyphosphate electrode material and its preparation method and its application as a positive electrode material for a sodium ion battery. As a cathode material for sodium ion batteries, it has high charge and discharge capacity, rate performance and cycle stability

Method used

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  • A nanosheet flower-shaped sodium vanadium oxyphosphate electrode material and its preparation method and application
  • A nanosheet flower-shaped sodium vanadium oxyphosphate electrode material and its preparation method and application
  • A nanosheet flower-shaped sodium vanadium oxyphosphate electrode material and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0031] (1) Dissolve 4mmol of ammonium metavanadate and 4mmol of citric acid in a mixed solution (70ml) of water and polyethylene glycol-400 with a volume ratio of 1:1, and stir in a water bath at 70°C until a blue color is formed Mix the solution evenly, then dissolve 4mmol ammonium dihydrogen phosphate and 6mmol sodium fluoride in the mixed solution, and obtain a uniform solution after continuous stirring;

[0032] (2) Dissolve 0.3g polyethylene glycol-20000 in the homogeneous solution prepared in step (1), fully stir and dissolve to obtain the precursor solution;

[0033] (3) Add the precursor solution prepared in step (2) into a polytetrafluoroethylene autoclave, seal it and place it in an electric oven for hydrothermal reaction at 200°C for 8 hours to obtain the precursor powder;

[0034] (4) After the precursor powder obtained in step (3) is centrifugally washed, separated and dried, it is placed in a high-temperature tube furnace for high-temperature preheating treatment...

Embodiment 2

[0036] (1) Dissolve 4mmol of ammonium metavanadate and 4mmol of citric acid in a mixed solution (70ml) of water and polyethylene glycol-400 with a volume ratio of 1:2, and stir in a water bath at 70°C until blue is formed Mix the solution evenly, then dissolve 4mmol ammonium dihydrogen phosphate and 6mmol sodium fluoride in the mixed solution, and obtain a uniform solution after continuous stirring;

[0037] (2) Dissolve 0.4g polyethylene glycol-20000 in the homogeneous solution prepared in step (1), fully stir and dissolve to obtain the precursor solution;

[0038] (3) Add the precursor solution prepared in step (2) into a polytetrafluoroethylene autoclave, seal it and place it in an electric oven for hydrothermal reaction at 200°C for 10 hours to obtain the precursor powder;

[0039] (4) After the precursor powder prepared in step (3) is centrifugally washed, separated and dried, it is placed in a high-temperature tube furnace for high-temperature preheating under an argon atm...

Embodiment 3

[0041] (1) Dissolve 4mmol ammonium metavanadate and 4mmol citric acid in a mixed solution (70ml) of water and polyethylene glycol-400 with a volume ratio of 1:4, and stir in a water bath at 70°C until blue is formed Mix the solution evenly, then dissolve 4mmol ammonium dihydrogen phosphate and 6mmol sodium fluoride in the mixed solution, and obtain a uniform solution after continuous stirring;

[0042] (2) Dissolve 0.6g polyethylene glycol-20000 in the homogeneous solution prepared in step (1), fully stir and dissolve to obtain the precursor solution;

[0043] (3) Add the precursor solution prepared in step (2) into a polytetrafluoroethylene autoclave, seal it and place it in an electric oven for hydrothermal reaction at 200°C for 12 hours to obtain a precursor powder;

[0044] (4) After the precursor powder prepared in step (3) is centrifugally washed, separated and dried, it is placed in a high-temperature tube furnace for high-temperature preheating treatment under an argon...

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Abstract

The invention discloses a nano-sheet flower-like sodium vanadium oxyphosphate electrode material, a preparation method thereof, and an application as a positive electrode material of a sodium ion battery. The method comprises: preparing a nano-sheet flower-like powder precursor through hydrothermal treatment, and then performing centrifugation, After washing and drying, two-step heat treatment is used to obtain the nano-sheet flower-shaped sodium vanadium oxyphosphate electrode material. The morphology and structure of the material are well maintained, and it is a micron-scale flower-shaped composition composed of nano-sheets. The specific surface area provides more reactive active sites for the electrochemical reaction of the positive electrode material during the charge and discharge process. At the same time, the surface of the material is coated with a thin carbon layer, which improves the electron transport rate of the positive electrode material, thereby accelerating the reaction kinetics of the composite material. The material has excellent rate performance and cycle life as a cathode material for sodium-ion batteries.

Description

technical field [0001] The invention relates to the field of positive electrode materials for sodium ion batteries, in particular to a nano-sheet flower-shaped sodium vanadium oxyphosphate electrode material, a preparation method thereof, and an application as a positive electrode material for sodium ion batteries. Background technique [0002] In the current society, due to the massive consumption of non-renewable fossil energy, energy problems need to be solved urgently. How to develop green and clean energy storage secondary batteries has attracted more and more attention. In recent years, among the many known secondary energy storage systems, sodium-ion batteries have gradually attracted the attention of researchers. Compared with lithium-ion batteries, sodium has similar electrochemical properties to lithium. Many research ideas can learn from the research results of lithium-ion batteries, and sodium is very abundant on the earth, which is close to inexhaustible. , and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/58H01M10/054B82Y30/00B82Y40/00
CPCH01M4/485H01M4/5825H01M10/054B82Y30/00B82Y40/00Y02E60/10
Inventor 涂江平黎维王秀丽夏新辉谷长栋
Owner ZHEJIANG UNIV
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