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Method for preparing fuel cell membrane electrode with integrative structure

A fuel cell membrane and electrode technology, used in fuel cell parts, fuel cells, battery electrodes, etc., can solve problems such as affecting the stability of the sealing structure, rupture of the proton membrane, and cumbersome process, so as to improve production efficiency and improve stability. performance, cost reduction

Inactive Publication Date: 2007-11-28
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This membrane electrode has the advantage of simple process, but there are some problems: 1. During the operation of the proton membrane, water absorption and water loss will cause the expansion and contraction of the proton membrane, resulting in poor dimensional stability of the membrane electrode; 2. Proton exchange The deformation of the membrane affects the stability of the sealing structure, and repeated deformation will also cause damage to the proton membrane, and even gas leakage; 3. When the line sealing method is used, the pressure of the seal is concentrated on a line, making the proton membrane The force is more concentrated, and it is easier to cause the rupture of the proton membrane, thereby reducing the service life of the membrane electrode and affecting the safety and stability of the fuel cell; 4. This membrane electrode structure requires the proton exchange membrane itself to play a certain role. Auxiliary sealing effect, the proton exchange membrane needs to extend to a larger area outside the active area, resulting in a waste of expensive proton exchange membrane; 5, the proton exchange membrane itself presents a certain acidity, and due to direct contact with sealing materials will The sealing material has a certain corrosion
However, the membrane electrode of this structure still has the following problems: 1. At the junction gap between the protective film frame and the carbon paper, the proton exchange membrane is severely deformed by extrusion and is prone to wrinkles
However, there are still some problems as follows: 1. The process is cumbersome; 2. In the "plasticizing" process, one device can only "plasticize" one gas diffusion layer, and the efficiency of the equipment is very low, and it is difficult to achieve continuous 3. The more important point is that its molding process has certain damage to the structure of carbon paper, and it also makes the melt-infiltrated KYNAR(R) film and carbon paper unable to form a good composite structure, due to its "plasticized" frame The strength is not high, and there is still a high gas permeability coefficient in the longitudinal direction, which affects the stability of the membrane electrode for long-term operation to a certain extent; 4. Because of its KYNAR film of sealing carbon paper and the hot-melt adhesive film for bonding It needs to be cut into a frame, and its central part is not well utilized, and the price of KYNAR(R) film and its hot-melt adhesive film itself is relatively high, which undoubtedly increases the material cost of the fuel cell

Method used

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  • Method for preparing fuel cell membrane electrode with integrative structure
  • Method for preparing fuel cell membrane electrode with integrative structure
  • Method for preparing fuel cell membrane electrode with integrative structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Preparation of gas diffusion layer:

[0037] 1. Reserve a certain sealing area around the TORRY carbon paper TGP-H-090 to be treated, spray the polytetrafluoroethylene dispersion with a solid content of 10% by weight in the central active area, and spray the polytetrafluoroethylene in the carbon paper The increase of ethylene reaches 10%; dry at 350°C for 15 minutes, and cool naturally;

[0038] 2. Mix 1 part (weight) of polytetrafluoroethylene dispersion, 3 parts (weight) of carbon powder and 100 parts (weight) of deionized water with a ball mill for 30 minutes to mix evenly, and then ultrasonically treat for 20 minutes to form a stable and non-sedimentation "ink"-like mixture;

[0039] 3. Reserve a certain sealing area to be treated around the carbon paper, and roll-coat the above-mentioned "ink"-like mixture on the central part to form a microporous thin layer with a thickness of 25 microns and a porosity of 60%, and dry it at 350°C for 20 Minutes, cool down nat...

Embodiment 2

[0050] 1. Preparation of gas diffusion layer:

[0051] 1. Reserve a certain sealing area around TORRY carbon paper TGP-H-060 to be treated, and use vacuum negative pressure method (negative pressure is -0.01MPa) to disperse polytetrafluoroethylene with a solid content of 10% by weight The liquid is evenly immersed in the central active area, and the increase of polytetrafluoroethylene in the carbon paper is controlled to reach 10%; it is dried at a temperature of 350°C for 15 minutes and cooled naturally;

[0052] 2. Stir 1 part (weight) of polytetrafluoroethylene dispersion, 3 parts (weight) of Vulcan-XC-72 carbon powder and 100 parts (weight) of deionized water for 30 minutes until uniformly mixed, and then ultrasonically treat for 20 minutes. Forms a stable, non-settling "ink"-like mixture;

[0053] 3. Reserve a certain sealing area to be treated around the carbon paper, and scrape the above-mentioned "ink"-like mixture with a scraper to form a microporous thin layer with ...

Embodiment 3

[0063] 1. Preparation of gas diffusion layer:

[0064] 1. Stir 1 part (weight) of polytetrafluoroethylene dispersion, 3 parts (weight) of Vulcan-XC-72 carbon powder and 100 parts (weight) of deionized water for 30 minutes until uniformly mixed, and then ultrasonically treat for 20 minutes. Forms a stable, non-settling "ink"-like mixture;

[0065] 2. Reserve a certain sealing area around the carbon paper GDL 30 BA of SGL company, and scrape the above-mentioned "ink"-like mixture with a scraper to form micropores with a thickness of 22 microns and a porosity of 50% in the central part Thin layer, dry at 350°C for 20 minutes, and cool naturally.

[0066] 2. Preparation of a gas diffusion unit with an integrated composite structure by casting method:

[0067] 1. Dissolve 1 part (weight) of polynaphthalene polyethersulfone resin in 9 parts (weight) of dimethylacetamide (DMAc);

[0068] 2. Put the mold on the gas diffusion layer, and align the reserved area of ​​the carbon paper ...

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Abstract

This invention relates to one integration structure fuel battery electrode process method, which comprises the following steps: A, reserving certain sealed zone on carbon paper outside for water discharge process; b, mixing the hydrophobic macromolecule resin dispersion liquid, carbon powder and water with certain proportion to form stable ink mixture without deposition; c, reserving certain sealing area to be processed covering the said mixture on central part to form gas dispersion layer; d, solving the resin and casting it in the area to form initial sealed film; e, pressing the above local combination structure to make resin and gas dispersion layer to form stable integration structure unit; , coating thermal glue layer on single or double side of the dispersion unit; g, processing integration structure electrode with catalyzer film under certain temperature and pressure.

Description

technical field [0001] The invention relates to a fuel cell, in particular to a method for preparing a fuel cell membrane electrode with an integrated structure. Background technique [0002] A fuel cell is an energy conversion device that converts chemical energy stored in fuels (such as hydrogen, lower alcohols, etc.) and oxidants (oxygen) into electrical energy according to electrochemical principles. [0003] Fuel cells have the advantages of high energy conversion rate and environmental friendliness, while Proton Exchange Membrane Fuel Cell (PEMFC) has the advantages of low-temperature operation and high specific power, so PEMFC is not only suitable for building decentralized power plants, but also for For mobile power sources, such as electric vehicles, submarines, etc., it is a new type of mobile power source for military and civilian use. [0004] The membrane electrode (Membrane Electrode Assembly, MEA) is the core component of the fuel cell. It is a device for the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M2/14
CPCY02E60/522H01M4/881H01M4/8882H01M8/1004H01M8/0286H01M8/0284H01M4/8896H01M8/023Y10T29/10Y02E60/50
Inventor 王传福董俊卿
Owner BYD CO LTD