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Nanosheet hydrated sodium vanadyl phosphate positive electrode material as well as preparation method and application thereof

A hydrated sodium vanadyl phosphate, nano-sheet technology, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve problems such as low working voltage, improve working voltage, facilitate embedding or de-embedding, promote The effect of reversible transformation

Inactive Publication Date: 2020-09-11
GUANGDONG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the working voltage provided by the existing sodium-ion battery positive electrode material is generally low, and provides a nano-flaky hydrated sodium vanadyl phosphate positive electrode material and its preparation method and application

Method used

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  • Nanosheet hydrated sodium vanadyl phosphate positive electrode material as well as preparation method and application thereof
  • Nanosheet hydrated sodium vanadyl phosphate positive electrode material as well as preparation method and application thereof
  • Nanosheet hydrated sodium vanadyl phosphate positive electrode material as well as preparation method and application thereof

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preparation example Construction

[0033] Concretely, the preparation method of a kind of nano flake hydrated sodium vanadyl phosphate cathode material of the present invention comprises the following steps:

[0034]Step 1. Add a certain amount of sodium source and phosphorus source to deionized water, and use magnetic stirring to dissolve them in deionized water as an electrolyte solution. Then use vanadium as an anode and platinum as a cathode. The platinum sheet is used as a counter electrode to carry out the electrochemical stripping reaction of the vanadium sheet, the reaction voltage of the electrochemical stripping reaction is 5-20V, and the reaction time is 2-10min.

[0035] The sodium source in the above step 1 is at least one of sodium sulfate, sodium chloride, sodium carbonate, sodium dihydrogen phosphate, sodium bicarbonate and sodium nitrate; the phosphorus source in the step 1 is ammonium dihydrogen phosphate, phosphoric acid, phosphoric acid At least one of sodium dihydrogen and metaphosphoric ac...

Embodiment 1

[0041] Accurately weigh 3.551g (25mmol) sodium sulfate and 2.8755g (25mmol) ammonium dihydrogen phosphate, add to 50mL deionized water, stir magnetically at room temperature for 10min, transfer the solution to a 100mL electrolytic cell, and then accurately measure the area of ​​one piece 2cm 2 1. A vanadium sheet with a thickness of 0.2mm, with the vanadium sheet as the anode and the platinum sheet as the cathode, the electrode spacing is adjusted to 3cm, and the electrochemical workstation is used to adjust the voltage to 20V for electrochemical stripping reaction for 3min. Then use a platinum sheet to replace the anode. At this time, both the cathode and the anode are platinum sheets, and keep the cathode and the anode at a distance of 3 cm. Use a voltage of 10V to continue the reaction for 20 minutes. Finally, the reaction product is centrifugally washed with deionized water and absolute ethanol. each three times, and vacuum-dried at 60° C. for 12 hours to obtain nanosheet-...

Embodiment 2

[0044] Accurately weigh 3.551g (25mmol) sodium sulfate and 0.560g (5mmol) ammonium dihydrogen phosphate, add them to 50mL deionized water, stir magnetically at room temperature for 10min, transfer the solution to a 100mL electrolytic cell, and then accurately measure the area of ​​a piece 1.5cm 2 1. A vanadium sheet with a thickness of 0.1mm, with the vanadium sheet as the anode and the platinum sheet as the cathode, the distance between the electrodes is adjusted to 2cm, and the electrochemical workstation is used to adjust the voltage to 10V to perform the electrochemical stripping reaction for 3min. Then use a platinum sheet to replace the anode. At this time, both the cathode and the anode are platinum sheets, and keep the cathode and the anode at a distance of 2 cm. Use a voltage of 15V to continue the reaction for 15 minutes. Finally, the reaction product is centrifugally washed with deionized water and absolute ethanol. each three times, and vacuum-dried at 80° C. for 6...

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Abstract

The invention discloses a nanosheet hydrated sodium vanadyl phosphate positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of batterymaterials. The invention discloses a preparation method of a nanosheet hydrated sodium vanadyl phosphate positive electrode material, wherein a novel Na0.5VOPO4.2H2O compound is synthesized by adopting an electrochemical stripping method and is used as a sodium ion battery positive electrode material; meanwhile, the specific preparation process is optimally designed and improved, so that the working voltage is well improved, the electrochemical activity of sodium ions is effectively improved, the positive electrode material system of the sodium ion battery is enriched, the energy density is high, the preparation process is simple, the consumed time is short, the flow is short, and the positive electrode material is one of ideal positive electrodes of the energy storage sodium ion battery.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and more specifically relates to a nanosheet-shaped hydrated sodium vanadyl phosphate positive electrode material and a preparation method and application thereof. Background technique [0002] Since the industrial revolution, fossil energy has been the main energy source of human society. With the development of science and technology, human beings have an increasing demand for energy, so they are facing a series of environmental problems caused by the gradual depletion of traditional fossil energy and traditional fossil energy. It is urgent to develop renewable clean energy such as solar energy, wind energy and tidal energy as an alternative to traditional fossil energy. However, secondary energy is intermittent and fluctuating, requiring the development of efficient energy storage devices. Lithium-ion batteries are currently the most widely used energy storage devices due to their ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58H01M10/054B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B25/45C01P2002/72C01P2004/03C01P2004/20C01P2004/64C01P2006/40H01M4/5825H01M10/054Y02E60/10
Inventor 芮先宏叶翔翔
Owner GUANGDONG UNIV OF TECH
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