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Iron-doped cobalt phosphide microsphere electrode material with flower-like structure, preparation method and application thereof

A flower-like structure, iron-doped technology, applied to chemical instruments and methods, phosphides, phosphorus compounds, etc., can solve the problems of poor specific capacity and cycle stability, achieve electrochemical stability improvement, suppress crushing, and ease volume The effect of swelling

Active Publication Date: 2020-02-14
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the specific capacity and cycle stability in the existing methods are poor, and it is urgent to invent an electrode material with a higher specific capacity and better cycle stability.

Method used

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  • Iron-doped cobalt phosphide microsphere electrode material with flower-like structure, preparation method and application thereof
  • Iron-doped cobalt phosphide microsphere electrode material with flower-like structure, preparation method and application thereof
  • Iron-doped cobalt phosphide microsphere electrode material with flower-like structure, preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0028] The osmanthus leaves (fresh osmanthus leaves picked from the campus of Jiangsu University of Science and Technology) that had been carbonized (calcined at 800°C for 2 hours under the protection of nitrogen) and then treated in 2mol / L nitric acid solution at 60°C for 6 hours were used as the base carbon film and immersed in 0.08mol / LCo(NO 3 ) 2 , 0.02mol / L Fe(NO 3 ) 3 , 0.5mol / L CO(NH 2 ) 2 , 0.3mol / L NH 4 The hydrothermal reaction of the F mixed solution was carried out at 100°C for 4 hours, and the precursor product was obtained by cooling; the obtained precursor product was washed and dried at 60°C, and then added sodium hypophosphite at 350°C under a nitrogen atmosphere for phosphating treatment 2 hours, NaH 2 PO 2 The mass ratio to the precursor product is 30:1, and after cooling, iron-doped cobalt phosphide microspheres with a flower-like structure are obtained.

Embodiment 2

[0032] After carbonization (calcined at 800°C for 2 hours under the protection of nitrogen) and then treated in 2mol / L nitric acid solution at 60°C for 6 hours, as the base carbon film, immerse the leaves containing 0.08mol / L Co(NO 3 ) 2 , 0.02mol / L Fe(NO 3 ) 3 , 0.5mol / LCO(NH 2 ) 2 , 0.3mol / LNH 4The hydrothermal reaction of the F mixed solution was carried out at 100°C for 8 hours, and cooled; the obtained precursor product was washed and dried at 60°C, and then phosphating was carried out at 350°C under a nitrogen atmosphere for 2 hours, NaH 2 PO 2 The mass ratio to the precursor product is 30:1, and after cooling, iron-doped cobalt phosphide microspheres with a flower-like structure are obtained.

Embodiment 3

[0034] After carbonization (calcined at 800°C for 2 hours under the protection of nitrogen) and then treated in 4mol / L nitric acid solution at 60°C for 10 hours, the osmanthus leaves were used as the base carbon film and immersed in the carbon film containing 0.08mol / L Co(NO 3 ) 2 , 0.02mol / L Fe(NO 3 ) 3 , 0.5mol / L CO(NH 2 ) 2 , 0.3mol / LNH 4 The hydrothermal reaction of the F mixed solution was carried out at 100°C for 4 hours, and then cooled; the obtained precursor product was washed and dried at 60°C, and then phosphating was carried out at 350°C under a nitrogen atmosphere for 2 hours, NaH 2 PO 2 The mass ratio to the precursor product is 30:1, and after cooling, iron-doped cobalt phosphide microspheres with a flower-like structure are obtained.

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Abstract

The invention discloses a preparation method and application of a flower-like iron-doped cobalt phosphide (Fe-CoP) microsphere for a sodium-ion battery negative electrode material. The method includes: taking carbonized sweet osmanthus leaves as a substrate carbon film, immersing the carbon film in a nitrate solution containing iron and cobalt for hydrothermal reaction, and when a hydrothermal kettle is cooled to room temperature after a certain period of reaction, washing and drying a precursor product, conducting phosphating treatment to obtain flower-like microsphere deposited on the carbonfilm with unchanged microstructure. The flower-like microsphere is composed of nanosheets and has a large specific surface area, and the microsphere is uniform in size, thus not only facilitating rapid transmission of ions, but also easing large volume expansion of the electrode material. The doped iron element can increase the sodium storage sites of the electrode material and improve the electrochemical performance of the electrode material. The invention provides a new idea for preparation of the sodium ion battery negative electrode material, and the preparation method has the characteristics of simple operation process and low preparation cost, and is expected to realize large-scale application.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and in particular relates to an iron-doped cobalt phosphide microsphere electrode material with a flower-like structure and a preparation method and application thereof. Background technique [0002] Sodium-ion batteries have not received much attention since their discovery in 1980. In recent years, due to the early warning of the shortage of lithium resources, the research on sodium-ion batteries has been gradually paid attention to. The sodium storage mechanism of sodium-ion batteries is similar to that of lithium-ion batteries. When charging, the Na inside the battery + Flow from the positive pole to the negative pole, and the electrons flow from the positive pole to the negative pole in the external circuit. The transport process of electrons and ions is also reversed during discharge. The energy density of sodium-ion batteries is not as high as that of lithium-ion batteries....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/08H01M4/58H01M10/054
CPCC01B25/08C01B25/088H01M4/5805H01M10/054C01P2002/72C01P2004/03C01P2006/40C01P2004/32Y02E60/10
Inventor 李雪莹徐亚林钱秀陈立庄于清方记文
Owner JIANGSU UNIV OF SCI & TECH
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