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Preparation method of flexible gas electrode for lithium-air battery and application of flexible gas electrode

A lithium-air battery and gas electrode technology, applied in the field of electrochemistry, can solve the problems of inability to apply flexible lithium-air batteries, lack of flexibility, and difficulty in commercialization, and achieve improved electrochemical performance, good flexibility, and good structure. The effect of stability

Inactive Publication Date: 2018-03-30
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional gas electrodes for lithium-air batteries usually load active materials on substrates such as carbon paper, stainless steel mesh, and porous ceramic sheets, which have no or poor flexibility and cannot be applied to flexible lithium-air batteries.
On the other hand, in order to increase the oxygen reaction rate of the positive electrode, reduce the charge-discharge overpotential of the lithium-air battery, and improve the Coulombic efficiency and cycle life, many studies have used noble metal catalysts as positive electrode active materials, such as Ru, Pt, Au, Ir, Pd, etc. , although it has good activity and stability, it is difficult to commercialize due to its high cost

Method used

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  • Preparation method of flexible gas electrode for lithium-air battery and application of flexible gas electrode
  • Preparation method of flexible gas electrode for lithium-air battery and application of flexible gas electrode
  • Preparation method of flexible gas electrode for lithium-air battery and application of flexible gas electrode

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Experimental program
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Effect test

Embodiment 1

[0040] The pretreated carbon cloth (CC) was cut into Φ20mm discs, placed in the cold sputtering device Leica EM SC050, with the Fe target as the Fe source, cold sputtering for 60s, and the sputtering current at 30mA. Put the obtained carbon cloth disc vertically on the ceramic boat, place it in the heating zone of the CVD furnace, first pass the argon gas to remove the air in the pipeline, adjust the argon gas flow rate to 100 sccm, and the hydrogen gas flow rate to 20 sccm, while the furnace operates at 5°C / min Raise to 650°C, keep warm for 30 minutes, and then feed methane with a flow rate of 20 sccm. After 20 minutes of deposition, turn off the methane gas, stop heating, and naturally cool down to obtain a carbon cloth (CNTs-CC) pole piece with carbon nanotubes. Then immerse the CNTs-CC disc into 0.005M KMnO 4 and 0.05M H 2 SO 4 In a mixed aqueous solution of 10°C, the reaction was slowly stirred for 12 hours at 10°C. After the reaction was completed, the impurities were ...

Embodiment 2

[0043] Cut the pretreated carbon cloth (CC) into Φ20mm discs and place them in 0.1M Ni(NO 3 ) 2 In the aqueous solution, immerse for 30 minutes, take out and blow dry at 60°C. Put the obtained carbon cloth disc vertically on the porcelain boat, place it in the heating zone of the CVD furnace, first pass the argon gas to remove the air in the pipeline, adjust the argon gas flow rate to 160 sccm, the hydrogen gas flow rate to 40 sccm, and the furnace at the same time at 5°C / min Raise to 700°C, keep warm for 30 minutes, and then feed ethanol vapor at a flow rate of 30 sccm. After 15 minutes of deposition, turn off the ethanol vapor, stop heating, and naturally cool down to obtain a carbon cloth (CNTs-CC) pole piece with carbon nanotubes. Then immerse the CNTs-CC disc into 0.01MKMnO 4 and 0.02M H 2 SO 4 In the mixed aqueous solution, the reaction was slowly stirred at 25°C for 6 hours. After the reaction was completed, the impurities were washed away with deionized water, and ...

Embodiment 3

[0046] Cut the pretreated carbon cloth (CC) into Φ20mm discs and place them in 0.1M Fe(NO 3 ) 2 In the aqueous solution, immerse for 30 minutes, take out and blow dry at 60°C. Put the obtained carbon cloth disc vertically on the porcelain boat, place it in the heating zone of the CVD furnace, first pass the argon gas to remove the air in the pipeline, adjust the flow rate of the argon gas to 200 sccm, and the flow rate of the hydrogen gas to 50 sccm, while the furnace operates at 5°C / min Raise to 750°C, keep warm for 30 minutes, and then feed ethylene with a flow rate of 50 sccm. After 10 minutes of deposition, turn off the ethanol vapor, stop heating, and naturally cool down to obtain a carbon cloth (CNTs-CC) pole piece with carbon nanotubes. Then immerse the CNTs-CC disc into 60ml 0.1MKMnO 4 In the aqueous solution, transfer it to a 100ml reactor and conduct a hydrothermal reaction at 180°C for 24 hours. After the reaction is completed, wash off impurities with deionized w...

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Abstract

The invention provides a preparation method of a flexible gas electrode for a lithium-air battery. The preparation method comprises the following steps of loading a metal catalyst on a carbon fabric after being processed in advance, uniformly growing a layer of carbon nanotubes (CNTs) on a surface of the carbon fabric by chemical vapor deposition (CVD), immersing prepared CNTs-CC in a certain concentration of mixed aqueous solution of KMnO4 and H2SO4 for reaction under a certain temperature, and performing washing and drying after reaction is completed. The obtained MnO2-CNTs-CC can be used for preparing the flexible gas electrode of the lithium-air battery and has favorable flexibility.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a preparation method and application of a flexible gas electrode for a lithium-air battery. Background technique [0002] Due to many advantages such as bendability, portability, and foldability, flexible electronic products are increasingly favored by people, and high-performance power devices are the key components of their composition. However, traditional energy storage / conversion devices are too bulky and rigid to be integrated into flexible electronic devices. To solve this problem, some new concepts, such as flexible solar cells, rechargeable batteries, supercapacitors, etc. have been proposed and studied. However, these new concept power devices with low theoretical energy density will essentially limit their wide application in the next generation of flexible electronics and electric vehicles. The non-aqueous lithium-air battery that has recently received in...

Claims

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Application Information

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IPC IPC(8): H01M4/1393H01M4/583H01M4/62H01M4/505H01M10/0525
CPCH01M4/1393H01M4/505H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 孙旺孙克宁吴海涛
Owner BEIJING INSTITUTE OF TECHNOLOGYGY