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Preparation method of self-supporting ferronickel phosphide composite nanosheet

A self-supporting, nano-sheet technology, applied in the direction of phosphide, nanotechnology, nanotechnology, etc., can solve the problems of limiting the development of lithium-ion batteries, low abundance, uneven distribution of lithium resources, etc., to achieve rich iron sources, not easy to fall off, The effect of the electrochemical performance advantage

Pending Publication Date: 2020-10-09
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the uneven distribution and low abundance of lithium resources greatly limit the further development of lithium-ion batteries in the future.

Method used

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  • Preparation method of self-supporting ferronickel phosphide composite nanosheet
  • Preparation method of self-supporting ferronickel phosphide composite nanosheet
  • Preparation method of self-supporting ferronickel phosphide composite nanosheet

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 1 mmol Ni(NO 3 ) 2 ·6H 2 O, 2 mmol Fe(NO 3 ) 3 ·9H 2 O, 6 mmol NH 4 F and 15 mmol CO(NH 2 ) 2 Place it in a beaker and add 70 mL of deionized water. Use a magnetic stirrer to stir the solution evenly. Transfer the solution to a 100 mL reactor, add foamed nickel (3cm 2 ), the nickel-iron composite precursor was prepared after hydrothermal reaction at 120 ℃ for 4 h. The nickel-iron composite precursor is dried at a constant temperature and placed in the sintering equipment, under a nitrogen atmosphere, 0.2g NaPO 2 H 2 ·H 2 O was placed in the air inlet of the sintering equipment with a distance of 10 cm from the nickel-iron composite precursor. The temperature was increased from room temperature at a rate of 2 ℃ / min to 350 ℃ for phosphating reaction for 2 h to obtain self-supporting nickel-iron-phosphorus composite nanosheets.

[0032] figure 1 It is the comparison between the XRD and the standard card of the composite material and the single material of nickel phosphide ...

Embodiment 2

[0034] Add 1 mmol Ni(NO 3 ) 2 ·6H 2 O, 6 mmol NH 4 F and 15 mmol CO(NH 2 ) 2 Place it in a beaker and add 70 mL of deionized water. Use a magnetic stirrer to stir the solution evenly. Transfer the solution to a 100 mL reactor, add foam nickel (3cm 2 ), the precursor was prepared after hydrothermal reaction at 120 ℃ for 4 h. The prepared precursor is dried at a constant temperature and placed in a sintering equipment. Under a nitrogen atmosphere, 0.2g NaPO 2 H 2 ·H 2 O is placed in the air inlet of the sintering equipment and is separated from the precursor by 10 cm. The temperature is increased from room temperature at a rate of 2 ℃ / min to 350 ℃ for phosphating reaction for 2 h to obtain nickel phosphide nanosheets.

[0035] Nickel phosphide (Ni 2 P) See XRD of nanosheets figure 1 Shown. Picture 8 This is the SEM image of a single nickel phosphide material before recycling, showing that the sample has a nanoplate structure and the nanoplatelets are composed of small particles. P...

Embodiment 3

[0037] Add 2 mmol Fe(NO 3 ) 3 ·9H 2 O, 6 mmol NH 4 F and 15 mmol CO(NH 2 ) 2 Place it in a beaker and add 70 mL of deionized water. Use a magnetic stirrer to stir the solution evenly. Transfer the solution to a 100 mL reactor, add foam nickel (3cm 2 ), the precursor was prepared after hydrothermal reaction at 120 ℃ for 4 h. The prepared precursor is dried at a constant temperature and placed in a sintering equipment. Under a nitrogen atmosphere, 0.2g NaPO 2 H 2 ·H 2 O is placed in the air inlet of the sintering equipment with a distance of 10 cm from the precursor, and the temperature is increased from room temperature at a rate of 2 ℃ / min to 350 ℃ for phosphating reaction for 2 h to obtain iron phosphide nanosheets.

[0038] Iron phosphide nanosheets (Fe 2 P) XRD diagram see figure 1 Shown. Picture 11 This is the SEM image of a single iron phosphide material before cycling, showing that the sample has a nanosheet structure and the nanosheets self-assemble into balls. Picture 12...

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Abstract

The invention provides a preparation method of a self-supporting nickel-iron-phosphorus (Ni-Fe-P) composite nanosheet. The preparation method comprises the following specific steps: preparing a mixedsolution from nickel nitrate, ferric nitrate, ammonium fluoride and urea in proportion, uniformly stirring, transferring into a reaction kettle, adding clean foamed nickel (3 * 5cm < 2 >, the purity is 99%), synthesizing a ferronickel composite precursor by using a hydrothermal reaction, and carrying out a phosphating reaction to obtain the ferronickel-phosphorus composite nanosheet. Compared witha single material of nickel phosphide and iron phosphide, the nickel-iron-phosphorus composite nanosheet serving as the negative electrode material of the sodium-ion battery has the advantages that the capacity and the stability of the battery during testing are improved, and relatively good electrochemical performance is shown. The nanosheet also shows good electrochemical performance as a potassium ion battery negative electrode material, and has potential application value in the field of potassium ion batteries.

Description

Technical field [0001] The invention relates to a nickel-iron-phosphorus composite nano material, in particular to a preparation method of a self-supporting nickel-iron-phosphorus composite nanosheet, which is applied to the negative electrode of a sodium ion battery and a potassium ion battery, and belongs to the field of sodium ion batteries and potassium ion batteries. [0002] technical background [0003] Due to the approach of the energy crisis and the deterioration of the ecological environment, it is urgent to develop sustainable clean energy and efficient energy storage equipment. Lithium ion batteries have been used in various fields of human life as energy storage devices. However, the uneven distribution and low abundance of lithium resources greatly limit the further development of lithium-ion batteries in the future. Nowadays, as a potential substitute for lithium-ion batteries, sodium-ion batteries have attracted much attention because of their resource abundance an...

Claims

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Application Information

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IPC IPC(8): C01B25/08H01M4/58H01M10/054B82Y30/00B82Y40/00
CPCC01B25/08H01M4/5805H01M10/054B82Y30/00B82Y40/00H01M2004/021H01M2004/027C01P2002/72C01P2004/03C01P2004/20C01P2004/04C01P2006/40Y02E60/10
Inventor 高林陈国豪刘洋杨学林
Owner CHINA THREE GORGES UNIV
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