Cobalt material with multi-sheet stacked structure for negative electrode of supercapacitor and preparation method thereof

A technology of supercapacitors and stacked structures, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double layer capacitors, etc. It can solve the problems of unfavorable ion transport in the electrolyte, poor stability of the connection state, and small gap spacing, etc., to achieve improved connectivity. State and stability, ease of material desorption, and the effect of preventing agglomeration

Active Publication Date: 2019-09-03
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to: solve the preparation method of the existing multi-layer stacked structure cobalt material, which is complicated and difficult to operate; the material morphology of the prepared multi-layer stacked structure is not only unfavorable for the transport of ions in the electrolyte, but also It cannot well alleviate the problem of material desorption caused by expansion of materials during electrochemical related tests; and the problems of poor connectivity, poor stability, and small gap spacing between sheets

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  • Cobalt material with multi-sheet stacked structure for negative electrode of supercapacitor and preparation method thereof
  • Cobalt material with multi-sheet stacked structure for negative electrode of supercapacitor and preparation method thereof

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preparation example Construction

[0042]Solve the problem that the preparation method of the existing cobalt material with multi-layer stacked structure is complicated and difficult to operate; the material morphology of the prepared multi-layer stacked structure is not only not conducive to the transport of ions in the electrolyte, but also cannot be well alleviated. The problem of material desorption caused by expansion of materials during electrochemical related tests; and the problems of poor connectivity, poor stability, and small gap spacing between sheets.

[0043] The present invention utilizes a solvothermal method, under high temperature conditions, cobalt material grows in situ on the surface of graphene, on the one hand, this composite material utilizes the high specific surface area of ​​graphene, and cobalt is inserted into the strongly wrinkled sheet of graphene, Increasing the distance between graphene sheets not only prevents the agglomeration of graphene itself, but also further increases the ...

Embodiment 1

[0046] 1) The concentration of graphene is 0.5-3g / L, weigh the graphene, add 13-20mL water to fully stir and sonicate;

[0047] 2) Weigh 0.5g of cobalt nitrate Co(NO 3 ) 2 , 50-500mg of urea and 100mg of NH 4 F powder, join step 1) in the graphene solution that obtains, stir 10 minutes;

[0048] 3) Weigh 2.5-25 mg of cetyltrimethylammonium bromide (CTAB) powder and add it to the mixed solution obtained in step 1), and stir for 10 minutes;

[0049] 4) Measure 5-13mL of ethanol and add it to the above mixed solution, and stir for 10 minutes;

[0050] 5) Transfer the liquid obtained in step 4) to a polytetrafluoroethylene reactor, react at 100-200 degrees Celsius, and the reaction time is 6-24 hours to obtain the first precipitate;

[0051] 6) Take the sediment for the first time and carry out centrifugal washing with water and ethanol;

[0052] 7) drying at a temperature of 30-100 degrees Celsius for 12 hours to obtain a solid of graphene and cobalt composite material;

[...

Embodiment 2

[0057] 1) The concentration of graphene is 0.5g / L, weigh the graphene, add 13mL water to fully stir and sonicate;

[0058] 2) Weigh 0.5g of Co(NO 3 ) 2 , 50mg of urea and 100mg of NH 4 F powder, join step 1) in the graphene solution that obtains, stir 10 minutes;

[0059] 3) Weigh 2.5 mg of CTAB powder and add it to the mixed solution obtained in step 2), and stir for 10 minutes;

[0060] 4) Measure 13 mL of ethanol and add it to the mixed solution obtained in step 3), and stir for 10 minutes;

[0061] 5) Transfer the liquid obtained in step 4) to a polytetrafluoroethylene reactor, react at 120 degrees Celsius, and the reaction time is 12 hours to obtain the first precipitate;

[0062] 6) Take the sediment for the first time and carry out centrifugal washing with water and ethanol;

[0063] 7) drying at a temperature of 70 degrees Celsius for 12 hours to obtain a solid of graphene and cobalt composite material;

[0064] 8) Weigh 10 g of NaCl solid and add it to 1 L of de...

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Abstract

The invention discloses a cobalt material with a multi-sheet stacked structure used for the negative electrode of a supercapacitor and a preparation method thereof, which belongs to the field of nanocomposite material preparation and solves the problem of poor connectivity between sheets, poor stability, and small gap spacing caused by the existing preparation method The problem. The technical scheme that the present invention adopts is as follows: a kind of preparation method of the cobalt material of multi-sheet stacked structure that is used for supercapacitor negative pole, graphene, Co(NO3) 2, urea, NH4F powder, hexadecyl trimethyl bromide Ammonium chloride and ethanol are added to water and mixed evenly, then reacted at high temperature to obtain the first precipitate; the first precipitate is washed and dried in turn to obtain the solid of graphene and cobalt composite material; the solid of graphene and cobalt composite material After being added to the ionized water for mixing, it is added to the chloride ion solution to react to obtain the second precipitate; the second precipitate is washed and dried in sequence to obtain a cobalt material with a multi-sheet stacked structure. The invention is used for preparing negative pole material of supercapacitor.

Description

technical field [0001] The invention discloses a method for preparing a cobalt material with a multi-sheet stacked structure used for the negative electrode of a supercapacitor, which is used for preparing the negative electrode material of a supercapacitor, and belongs to the field of nanocomposite material preparation. Background technique [0002] With the continuous use of fuel vehicles and fossil fuels around the world, the resulting environmental problems have become increasingly prominent, and the news of banning the sale of fuel vehicles is also constantly entering people's field of vision. At present, countries that have proposed a timetable for banning the sale of fuel vehicles include Norway, the Netherlands, Germany, the United Kingdom, France, and India. The Ministry of Industry and Information Technology of China proposed at the TEDA Forum held on September 9, 2017 that China is also actively formulating a ban on the sale of fuel vehicles. This initiative shows...

Claims

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Application Information

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IPC IPC(8): H01G11/26H01G11/86
Inventor 王艳雷涛陈泽祥张继君闫欣雨周智雨吕慧芳
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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