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Consecution dried embedding production process for gaseous diffusion electrodes

A gas diffusion electrode and manufacturing process technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve uneconomical problems and achieve low cost, high efficiency, and good consistency

Inactive Publication Date: 2004-12-29
LIFERISING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention of this preparation process also requires the preparation of carbon paste with good fluidity, but the preparation of consistency requires multi-step quality control, so it is also uneconomical

Method used

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Examples

Experimental program
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Embodiment Construction

[0012] The invention provides a continuous dry embedding process for producing gas diffusion electrodes in fuel cells. The process of directly preparing the dry powder containing catalytic carbon into a gas diffusion electrode is as follows:

[0013] 1. Powder preparation: Put 375g of carbon powder (Vulcan XC-72) into a 4L beaker, then add 100g of KMnO in order 4 Mix powder, 2500g deionized water, 25g Triton X-100 and 1g polyvinyl alcohol, stir vigorously at 75°C for 30 minutes, then cool to 30°C; then add 360g Telfon T-30 (60% solid content) and fully stirred to form a paste; the paste is filtered, dried and finely powdered to form a dry powder suitable for the dry embedding process;

[0014] 2. The powder is evenly preheated in the dry inserter container at a preheating temperature of 75°C;

[0015] 3. The fluid collector passes through the dry-embedded container continuously and evenly, centered up and down,

[0016] 4. The powder is evenly dispersed on both sides of the...

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PUM

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Abstract

The invention discloses a gas diffusion electrode continuous dried embedding production process for the fuel cells, which comprises preparing plaster shaped article from powdered material, filtering and drying to obtain dried powder suitable for dried embedding production process, homogeneously preheating in container, passing the flow concentration continuously and homogeneously through the container, dispersing the powder homogeneously through the spiral scattering device tot the two sides of the flow concentration, making electrode shapes in the dried embedding device, subjecting the pole pieces to thermal treatment agglutination and rolling in semi-closed heating chamber, cutting into suitable sizes and shapes longitudinally or transversely.

Description

technical field [0001] The invention belongs to the technical field of manufacturing electrochemical cell parts, in particular to a continuous dry embedding manufacturing process of a gas diffusion electrode in a fuel cell. technical background [0002] Gas diffusion electrodes are widely used in the chlor-alkali industry, gas sensors and fuel cells, etc. Taking fuel cells as an example, hydrogen-oxygen or metal-air fuel cells generate electrical energy through an electrochemical pair consisting of an anode (hydrogen electrode or metal electrode such as zinc, aluminum, etc.) and an air cathode placed in a suitable electrolyte. The air electrode must be both diffusible and permeable to air, yet sufficiently hydrophobic to keep the liquid electrolyte from leaking out, and mixed with a conductive material for collecting electrons to form an external circuit. US Patent No. 4,129,633 discloses a method for preparing a gas diffusion electrode using a dry powder dispersed on a dri...

Claims

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Application Information

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IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 王晓功关玉明张伟玲
Owner LIFERISING