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Gas diffusion electrode and preparation method thereof

A gas diffusion electrode and one-sided technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of electrode performance attenuation, gas diffusion layer damage, attenuation, etc., and achieve low manufacturing cost, long service life, and high production efficiency. Effect

Inactive Publication Date: 2018-07-31
张树雄
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main reason for the attenuation of the existing electrode performance is also due to the gradual destruction of the gas diffusion layer during the discharge process.
[0007] Therefore, long-lived electrodes need to have high gas diffusion efficiency and excellent strength to avoid lifetime attenuation due to insufficient gas diffusion.

Method used

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preparation example Construction

[0038] A method for preparing the gas diffusion electrode is also provided, and the method includes the following steps:

[0039] (4) Cold pressing the current collector conductor with a certain size and a thickness of 0.1-2mm and the transition layer with a thickness of 0.5-3mm;

[0040] (5) One side of the transition layer is sprayed with a catalytic layer slurry with a thickness of 0.005-0.5mm, dried at 10-100°C and hot-pressed at 20-80°C;

[0041] (6) Cold press the other side of the transition layer in step (2) and the waterproof and breathable layer with a thickness of 0.05-0.5mm to form an electrode sheet with a thickness of 0.5-2mm, and hot press at 30-400°C to form a gas diffusion electrode.

[0042] Another preparation method of the gas diffusion electrode is also provided, the method includes the following steps:

[0043] (1) at certain size, one side of the transition layer with a thickness of 0.5-3mm is sprayed with catalytic layer slurry, and the thickness is 0....

Embodiment 1

[0063] A method for manufacturing an air electrode, comprising a catalytic layer, a transition layer, a current-collecting conductive layer, and a waterproof and breathable layer.

[0064] The manufacturing method of the above-mentioned air electrode: cold-press a copper mesh with a certain size and a thickness of 0.2 and a transition layer with a thickness of 0.5 mm; Hot pressed at 30°C. Finally, spray the adhesive on the other side of the sheet and cold press it with a waterproof and breathable layer with a thickness of 0.18 mm to form an electrode sheet with a thickness of 1 mm. Finally, the electrode sheet was fired at 350°C to form a gas diffusion electrode.

[0065] The method for making the transition layer of the above-mentioned air electrode: 40% by mass of acetylene black and 60% by mass of polytetrafluoroethylene emulsion are uniformly mixed with absolute ethanol. The prepared transition layer raw material is finally made into a transition layer material with a th...

Embodiment 2

[0070] A method for manufacturing an air electrode, comprising a catalytic layer, a transition layer, a current-collecting conductive layer, and a waterproof and breathable layer.

[0071] The manufacturing method of the above-mentioned air electrode: cold-press a copper mesh with a certain size and a thickness of 0.3 and a transition layer with a thickness of 0.6 mm; then spray a catalytic slurry with a thickness of 0.06 mm on the copper mesh surface, dry it at 50 ° C and Hot pressed at 30°C. Finally, the other side of the sheet body is sprayed with an adhesive and cold-pressed with a waterproof and breathable layer with a thickness of 0.2mm to form a 1.2mm thick electrode sheet. Finally, the electrode sheet was fired at 350°C to form a gas diffusion electrode.

[0072] The method for making the transition layer of the above-mentioned air electrode: 45% by mass of acetylene black and 55% by mass of polytetrafluoroethylene emulsion are uniformly mixed with absolute ethanol. ...

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Abstract

The invention discloses a gas diffusion electrode. The gas diffusion electrode is low in manufacturing cost, high in production efficiency and long in service lifetime. The gas diffusion electrode comprises a catalytic layer, a transition layer, a current collection conductor and a waterproof ventilation layer, wherein the catalytic layer comprises a carrier material and an active constituent, thetransition layer is formed by pasting and laminating a binding agent and porous particles, the porous particles are conductive particles with high specific surface, the binding agent is a polytetrafluoroethylene, polyvinylidene fluoride or fluorinated ethylene-propylene copolymer, the current collection conductor is a carbon conductor in forms of copper, aluminum, nickel, silver, stainless steel,alloy, carbon fiber, carbon paper or carbon felt, the waterproof ventilation layer is a porous hydrophobic ventilation film, and the material of the waterproof ventilation layer is a polytetrafluoroethylene, polyvinylidene fluoride or fluorinated ethylene-propylene copolymer. The invention also discloses a method for preparing the gas diffusion electrode.

Description

technical field [0001] The invention relates to the technical field of new energy batteries, in particular to a gas diffusion electrode and a method for preparing the gas diffusion electrode. Background technique [0002] Metal-air batteries have the advantages of large capacity, high specific energy, stable working voltage, safe use, low price, and no environmental pollution. They have always been the focus of domestic and foreign scholars and enterprises. With the development of metal-air battery research and technology, its application potential has been gradually tapped and is still expanding. In addition to traditional application fields such as emergency lighting, navigation lights and portable backup power supplies, it is currently being developed for field monitoring, communication base stations and high-power power supplies for electric vehicles. [0003] A gas diffusion electrode is a widely used electrode in fuel cells and metal-air batteries. The electrode is a...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/94H01M4/88
CPCH01M4/8657H01M4/88H01M4/8828H01M4/8875H01M4/94Y02E60/50
Inventor 张树雄张云帆洪磊
Owner 张树雄
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