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A kind of ni4ohf7 electrode material and its preparation method and application

An electrode material, solvothermal reaction technology, applied in chemical instruments and methods, nickel compounds, inorganic chemistry, etc., can solve problems such as hindering large-scale application, reducing the specific surface area of ​​electrode materials, and low specific capacitance of carbon materials.

Active Publication Date: 2021-12-10
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For carbon materials, the capacitance value is proportional to the specific surface area of ​​the electrode, and the specific surface area of ​​carbon materials is relatively low, resulting in low specific capacitance of carbon materials; for conductive polymers and transition metal oxide related materials, its The stability is poor, and it cannot meet the needs of long-term charge and discharge, especially the classic pseudocapacitive materials, such as RuO 2 , MnO 2 and Ni(OH) 2 , are limited in practical applications due to their low specific capacitance and narrow potential window
[0003] With the development of science and technology, researchers have developed Ni 4 OHF 7 Nano-electrode material, although this material has improved a certain capacitance, but the existing Ni 4 OHF 7 The easy agglomeration of nanoelectrode materials reduces the specific surface area of ​​electrode materials, hindering their large-scale application in high-performance supercapacitors

Method used

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  • A kind of ni4ohf7 electrode material and its preparation method and application
  • A kind of ni4ohf7 electrode material and its preparation method and application
  • A kind of ni4ohf7 electrode material and its preparation method and application

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preparation example Construction

[0033] The invention provides a Ni 4 OHF 7 The preparation method of electrode material, comprises the following steps:

[0034] Mixing divalent nickel salt, ammonium fluoride and ethylene glycol to obtain a mixed solution;

[0035] The mixed solution is subjected to solvothermal reaction to obtain the Ni 4 OHF 7 electrode material.

[0036] In the present invention, all raw materials are conventional commercially available products unless otherwise specified.

[0037] The invention mixes divalent nickel salt, ammonium fluoride and ethylene glycol to obtain a mixed solution. In the present invention, the divalent nickel salt preferably includes nickel nitrate, nickel chloride, nickel acetate or nickel sulfate, more preferably nickel chloride or nickel sulfate. In the present invention, the molar ratio of the divalent nickel salt to ammonium fluoride is preferably 5-10:5-20, more preferably 5-10:10-15; The molar ratio of nickel salt and ammonium fluoride is 10:15 or 5:20...

Embodiment 1

[0058] Stir 10mmol of nickel chloride, 15mmol of ammonium fluoride and 30mL of ethylene glycol at a speed of 6000r / min for 1h, and then sonicate for 1h at a power of 90W to obtain a mixed solution;

[0059] The mixed solution was heated up to 160°C at a heating rate of 10°C / min for 20h solvothermal reaction, the product of the solvothermal reaction was cooled to 25°C and then centrifuged at a speed of 6500r / min for 30min, and the centrifuged solid was After washing (3 times with water and 1 time with absolute ethanol), dry at 60°C for 12 hours to obtain Ni 4 OHF 7 electrode material.

Embodiment 2

[0061] Stir 5mmol of nickel chloride, 20mmol of ammonium fluoride and 40mL of ethylene glycol at a speed of 7000r / min for 0.5h, then sonicate for 0.5h at a power of 80W to obtain a mixed solution;

[0062] The mixed solution was heated up to 140°C at a heating rate of 10°C / min for 30h solvothermal reaction, the product of the solvothermal reaction was cooled to 20°C and then centrifuged at a speed of 7000r / min, and the centrifuged solid was washed (washed 4 times with water and 2 times with absolute ethanol) and dried at 70°C for 12 hours to obtain Ni 4 OHF 7 electrode material.

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Abstract

The invention belongs to the technical field of electrode materials, in particular to a Ni 4 OHF 7 Electrode materials and their preparation methods and applications. The invention provides a Ni 4 OHF 7 A preparation method for an electrode material, comprising the following steps: mixing divalent nickel salt, ammonium fluoride and ethylene glycol to obtain a mixed solution; performing a solvothermal reaction on the mixed solution to obtain the Ni 4 OHF 7 electrode material. The Ni prepared according to the preparation method provided by the invention 4 OHF 7 The electrode material is evenly dispersed, not easy to agglomerate, has a large specific surface area, can provide more active sites, is conducive to the full contact between the active material and the electrolyte, and facilitates the rapid transfer of electrons and ions, thereby improving the electric capacity of the supercapacitor. chemical properties. The preparation method provided by the invention is relatively simple and suitable for large-scale mass production.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, in particular to a Ni 4 OHF 7 Electrode materials and their preparation methods and applications. Background technique [0002] To compensate for the shortage of traditional fossil fuels, the development of alternative, sustainable energy storage and conversion devices has become an urgent need. As a new type of green energy storage device, supercapacitors have attracted extensive attention due to their high specific capacitance, long cycle life and good rate capability. Electrode materials are the key to supercapacitors and determine the main indicators of energy storage devices. Common electrode materials can be divided into three categories: carbon materials that store energy through electrostatic adsorption, conductive polymer materials and transition metal oxide materials that rely on redox reactions on the surface and subsurface of electrode materials for energy storage. . ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00C01G53/08
CPCC01G53/00C01G53/08C01P2002/72C01P2004/03C01P2004/04C01P2006/17
Inventor 田宏伟时玮孟泽硕
Owner JILIN UNIV