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Graphene and/or carbon nanotube-containing air electrode, preparation method thereof and metal air battery

A carbon nanotube, air electrode technology, applied in battery electrodes, fuel cell type half cells and primary cell type half cells, circuits, etc. The effect of good thermal conductivity, excellent electrical conductivity and high discharge performance

Inactive Publication Date: 2017-10-10
北京碳阳科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still deficiencies in metal-air batteries, such as the poor conductivity of the air electrode, which limits the application of metal-air batteries.

Method used

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  • Graphene and/or carbon nanotube-containing air electrode, preparation method thereof and metal air battery
  • Graphene and/or carbon nanotube-containing air electrode, preparation method thereof and metal air battery

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preparation example Construction

[0024] The second aspect of the present invention provides a method for preparing an air electrode containing graphene and / or carbon nanotubes, wherein the preparation method comprises the following steps:

[0025] (1) Conducting agent A, catalyst, binding agent A are mixed with absolute ethanol, and the obtained mixture is pressed into a membrane, the membrane is extracted in absolute alcohol, and then dried to obtain a catalytic layer, wherein , the conductive agent A includes graphene and / or carbon nanotubes;

[0026] (2) Provide a waterproof and breathable layer;

[0027] (3) The catalytic layer prepared in step (1), the current collector and the waterproof and breathable layer are sequentially stacked, and then pressed into shape.

[0028] According to the present invention, in order to further improve the electrical conductivity and thermal conductivity of the air electrode, preferably, the particle size of the graphene is 100m 2 / g, more preferably 150-300m 2 / g; pr...

Embodiment 1

[0051] The composition of catalytic layer: 70% by weight conductive agent A (graphene and gac, wherein, the consumption of graphene is 14% by weight, and graphene is in dispersion liquid form, and solid content is 5% by weight), 10% by weight of nanometer MnO 2 , 20% by weight PTFE.

[0052] Composition of the waterproof breathable layer: 40% by weight of conductive agent B (activated carbon and acetylene black), and 60% by weight of polyvinylidene fluoride.

[0053] (1) Preparation of catalytic layer

[0054] According to the above ratio, firstly, conductive agent A, nanometer MnO 2 Mix it with absolute ethanol in a beaker, stir and sonicate for 1 hour, then add polytetrafluoroethylene to the above mixture drop by drop, continue to stir and mix evenly, and then roll repeatedly to form a membrane with a thickness of 0.15mm, which is immersed in Extract in water and ethanol for 24 hours, take out the membrane, and dry at 60° C. for 12 hours to obtain a catalytic layer.

[00...

Embodiment 2

[0060] The composition of catalytic layer: 70% by weight conductive agent A (graphene, carbon nanotube and gac, wherein, the consumption of graphene and carbon nanotube is respectively 8 weight percent, graphene and carbon nanotube are in dispersion liquid form, solid content 10% by weight), 15% by weight nano MnO 2 , 15% by weight PTFE.

[0061] Composition of the waterproof breathable layer: 50% by weight of conductive agent B (activated carbon and acetylene black), 50% by weight of polyvinylidene fluoride.

[0062] (1) Preparation of catalytic layer

[0063] According to the above ratio, firstly, conductive agent A, nanometer MnO 2 Put it into a beaker with absolute ethanol, stir and ultrasonically for 2 hours, then add polytetrafluoroethylene to the above mixture drop by drop, continue to stir and mix evenly, and then roll repeatedly to form a membrane with a thickness of 0.2mm, immerse in anhydrous Extract in ethanol for 48 hours, take out the membrane, and dry at 80° ...

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Abstract

The invention relates to the field of air batteries, and discloses an air electrode containing graphene and / or carbon nanotubes, a preparation method thereof, and a metal-air battery. It is characterized in that, the catalytic layer contains a conductive agent A, a catalyst and a binder A, and the conductive agent A includes graphene and / or carbon nanotubes. The metal-air battery containing the air electrode of the present invention has better electrical and thermal conductivity.

Description

technical field [0001] The invention relates to the field of air batteries, in particular to an air electrode containing graphene and / or carbon nanotubes, a preparation method thereof, and a metal-air battery. Background technique [0002] A metal-air battery is a new type of fuel cell that uses oxygen in the air as the positive electrode active material, active metals such as zinc, aluminum, and magnesium as the negative electrode, and alkaline or neutral salt solution as the electrolyte to generate electricity through electrochemical reactions. . The air electrode is a gas-permeable but liquid-impermeable, conductive and catalytically active film. In the metal-air battery, the side of the catalytic layer contacts the electrolyte, and the side of the waterproof and breathable layer contacts the air. The oxygen in the air diffuses through the air electrode to reach the gas. - The liquid-solid three-phase interface, the reduction reaction of oxygen occurs, and the oxidation ...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M12/06
CPCH01M4/8673H01M4/8875H01M12/06
Inventor 刘丹宪杨维谦
Owner 北京碳阳科技有限公司
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