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Preparation method of carbon nano tube array/carbon fiber fabric integrated three-dimensional porous air electrode

A technology of carbon nanotube arrays and carbon fiber fabrics, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low energy conversion efficiency and power density, high electrode concentration polarization and ohmic polarization, mass transfer and load transfer Low capacity and other problems, to achieve the effect of excellent mechanical strength and chemical stability, high conductivity electron transport conductor, parallel channel structure

Inactive Publication Date: 2013-10-02
TAIYUAN UNIV OF TECH
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Problems solved by technology

The main reason is: during the discharge process of lithium-air battery, O 2 and Li + Respectively enter into the microporous channels of the cathode material from both sides of the cathode to react, and generate insoluble solid oxides (Li 2 o 2 ), as the discharge process proceeds, Li 2 o 2 The yield increases and it is easy to clog the micropore channels, resulting in O on both sides of the cathode 2 and Li + The transmission ability in the electrode is reduced or even terminated[Hayashi M, Minowa H, Takahashi M, et al. Surface properties and electrochemical performance of carbon materials for air electrodes of lithium-air batteries[J]. Electrochemistry, 2010, 78(5) :325-328.]
At present, it is precisely because the mass transfer and charge transfer capacity of the lithium-air battery cathode is low, which limits the rate of the electrochemical reaction of oxygen reduction, resulting in high concentration polarization and ohmic polarization inside the electrode, which is considered to be a lithium-air battery. Main reasons for low energy conversion efficiency and power density

Method used

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  • Preparation method of carbon nano tube array/carbon fiber fabric integrated three-dimensional porous air electrode
  • Preparation method of carbon nano tube array/carbon fiber fabric integrated three-dimensional porous air electrode
  • Preparation method of carbon nano tube array/carbon fiber fabric integrated three-dimensional porous air electrode

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preparation example Construction

[0038] The preparation method of the above-mentioned carbon nanotube array / carbon fiber fabric integrated air electrode includes the following four processes:

[0039] ⑴ Pretreatment of carbon fiber fabric

[0040] First, prepare the coating slurry on the surface of the carbon fiber fabric. Mix conductive carbon black with ammonium salt of oxidizing acid. The ammonium salt of oxidizing acid has strong oxidizing properties, and can oxidize the surface of conductive carbon black to produce a large number of hydrophilic groups such as hydroxyl, carbonyl and carboxyl on the surface. Group, easy to disperse into silica sol solution. In the inventive method, the ammonium salt of oxidizing acid comprises ammonium nitrate, ammonium sulfate, ammonium chlorate, ammonium persulfate, ammonium perborate and ammonium percarbonate, and the ammonium salt of conductive carbon black and oxidizing acid is by its mass ratio 1 : 0.01-2 mixed, the effect on the oxidation of conductive carbon blac...

Embodiment 1

[0050] Add 0.5g of conductive carbon black and 0.05g of ammonium persulfate into 100ml of deionized water, ultrasonically disperse for 1h, then mechanically stir at 25°C for 10h, then filter with suction and wash with distilled water for 5 times, and put the solid in a vacuum drying oven , dried at 80°C to constant weight. Add 0.5 g of modified carbon black and 5 g of ferric nitrate to 10 g of silica sol solution, and mechanically stir at room temperature for 36 hours to form a mixed solution. Remove the surface of the 3cm×4cm carbon fiber matrix, take the above mixed solution and spread it evenly on the carbon paper, let it dry after the first drop, continue to drop the second drop, repeat this way 5 times. Then put the carbon fiber matrix into the high-temperature tubular reactor, at a gas flow rate of 500cm 3 The temperature was raised to 800°C under the protection of argon gas per minute, kept for 1 h, and then lowered to room temperature under the protection of argon gas...

Embodiment 2

[0054] Add 0.5g of conductive carbon black and 0.1g of ammonium sulfate into 100ml of deionized water, ultrasonically disperse for 1.5h, then mechanically stir at 30°C for 15h, then filter with suction and wash with distilled water for 7 times, and put the solid in a vacuum drying oven , dried at 90°C to constant weight. Take the above 0.5g of modified carbon black and 3g of cobalt nitrate and add them into 15g of silica sol solution, and mechanically stir at room temperature for 24h to form a mixed solution. Remove the surface of the 3cm×4cm carbon fiber matrix, take the above mixed solution and spread it evenly on the carbon paper, let it dry after the first drop, continue to drop the second drop, and repeat this for 7 times. Then put the carbon fiber matrix into the high-temperature tubular reactor, at a gas flow rate of 500cm 3 The temperature was raised to 700°C under the protection of argon gas per minute, kept for 2 hours, and then lowered to room temperature under the...

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Abstract

The invention discloses a preparation method of a carbon nano tube array / carbon fiber fabric integrated three-dimensional porous air electrode. The preparation method comprises the following steps of: taking carbon fiber fabric as a matrix, depositing a carbon nano tube array on the matrix, taking a carbon tube as a catalyst carrier, carrying nano-level MnO2 particles by an electric depositing method, and finally forming the catalytic air electrode. The air electrode prepared by the preparation method has the advantages of high specific surface area, parallel hole channel structures, high-conductivity electron transporting conductors and excellent mechanical strength and chemical stability, and is an ideal electrode material for preparing a composite air electrode of a large-capacity novel lithium-air battery.

Description

technical field [0001] The invention relates to a method for preparing an air electrode of a lithium-air battery, and furthermore, a method for preparing a three-dimensional porous air electrode integrated with a carbon nanotube array / carbon fiber fabric. Background technique [0002] Fossil fuel resources are limited and the pollution of the ecological environment is becoming more and more serious. Energy saving, emission reduction and development of new energy are important issues in today's society. As an ideal secondary alternative energy source, batteries are used in portable electronic products and new electric vehicles. Although traditional lithium-ion batteries can provide relatively high specific energy (150-250Wh / kg), the specific capacity of the cathode material is low (≤200mAh / g), resulting in limited energy density of lithium-ion batteries, which cannot meet the needs of electric vehicles. Energy density of automotive power supply (700Wh / kg) [Cui Guanglei, Dong...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90
CPCY02E60/50
Inventor 刘世斌李瑜黄彦芳卫国强张鼎张忠林郝晓刚
Owner TAIYUAN UNIV OF TECH
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