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Method for manufacturing membrane electrode assembly for fuel cell

A technology of membrane electrode assembly and manufacturing method, which is applied to fuel cell components, fuel cells, battery electrodes, etc., and can solve problems such as catalyst layer detachment, catalyst density reduction, battery discharge rate or cycle life characteristics reduction, etc.

Inactive Publication Date: 2005-10-19
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using this kind of MEA, the performance of the battery cannot be fully utilized
[0042] 3. When the catalyst coating is directly coated on the surface of the polymer electrolyte membrane, the mechanical strength of the polymer electrolyte membrane is generally small, and the polymer electrolyte membrane is dissolved and swollen due to the solvent component contained in the catalyst coating. In these aspects both become a problem and cannot get a good MEA
When a large crack occurs on the surface of the catalyst layer, the catalyst density of the catalyst layer decreases, or the catalyst layer falls off from the cracked part, and the discharge rate and cycle life characteristics of the battery may decrease.

Method used

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  • Method for manufacturing membrane electrode assembly for fuel cell
  • Method for manufacturing membrane electrode assembly for fuel cell
  • Method for manufacturing membrane electrode assembly for fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0125] First, Embodiment 1 will be described.

[0126] figure 1 A schematic configuration diagram of a membrane electrode assembly used in this embodiment is shown. in addition, image 3 A cross-sectional view of PP' is shown. 9 is a strip-shaped base material used for continuous production of the membrane electrode assembly, and each layer is formed thereon.

[0127] 201 is the first catalyst layer, which is formed on the substrate 9 . In addition, 301 is a polymer electrolyte layer formed on the first catalyst layer 201 . In addition, 401 is a second catalyst layer formed on the polymer electrolyte layer 301 .

[0128] Furthermore, the first catalyst layer 201 is a layer used as a hydrogen electrode, and the second catalyst layer 401 is a layer used as an oxygen electrode.

[0129] The membrane electrode assembly used in the present embodiment was produced as follows.

[0130] That is, the substrate 9 made of polyethylene terephthalate or polypropylene moves continuous...

Embodiment approach 2

[0166] Figure 4 It is a process schematic diagram which shows an example of the manufacturing method of MEA of this invention. Figure 4In the illustrated example, a strip-shaped substrate 1001 is continuously conveyed, and a catalyst coating 1002 , a polymer electrolyte coating 1003 , and a catalyst coating 1004 are sequentially coated on the substrate 1001 . Coating of the catalyst coating 1002, the polymer electrolyte coating 1003, and the catalyst coating 1004 is performed by coating devices 1051, 1052, and 1053, respectively.

[0167] in addition, Figure 4 In the example shown in , the polymer electrolyte coating 1003 is coated on the catalyst coating layer 1021, and the catalyst coating 1004 is coated on the polymer electrolyte coating layer 1031 before the polymer electrolyte coating layer 1031 is dried. In addition, "before drying" in this specification refers to a state in which the concentration of the polymer electrolyte in the polymer electrolyte coating layer ...

Embodiment approach 3

[0221] Figure 8 It is a process schematic diagram which shows an example of the MEA manufacturing method of this invention. Figure 8 In the illustrated example, a strip-shaped substrate 1101 is continuously conveyed, and a catalyst coating 1102 , a polymer electrolyte coating 1103 , and a catalyst coating 1104 are sequentially coated on the substrate 1101 . Coating of the catalyst coating 1102, the polymer electrolyte coating 1103, and the catalyst coating 1104 is performed by coating devices 1151, 1152, and 1153, respectively.

[0222] The applied paints become the catalyst paint layers 1121, 1141 and the polymer electrolyte paint layer 1131. After drying by the drying device 1154, if the substrate 1101 is removed, the catalyst layer 1122 and the polymer electrolyte layer are stacked. 1132 , the MEA of the catalyst layer 1142 .

[0223] Here, the polymer electrolyte paint 1103 only needs to contain a gelling agent. By containing the gelling agent, the fluidity of the pol...

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Abstract

A method for manufacturing a membrane electrode assembly for a fuel cell, which greatly improves the productivity and performance of the fuel cell. The method comprises a first catalyst layer forming step wherein a first catalyst layer (201) is formed by applying a noble metal-loaded first coating compound on a moving base (9), an electrolyte forming step wherein an electrolyte layer (301) is formed by applying a second coating compound, which contains a hydrogen ion-conductive resin, on the first catalyst layer (201) while the layer (201) is wet, a drying step wherein the electrolyte layer (301) is dried, and a second catalyst layer forming step wherein a second catalyst layer (401) is formed by applying a noble metal-loaded third coating compound on the dried electrolyte layer (301).

Description

technical field [0001] The present invention relates to a method for producing a membrane electrode assembly for a fuel cell for producing a membrane electrode assembly for a fuel cell used in a solid polymer fuel cell, an apparatus for producing the membrane electrode assembly, a polymer electrolyte coating for a fuel cell, and Polymer electrolyte fuel cell. Background technique [0002] A fuel cell is an object that electrochemically reacts a fuel gas containing hydrogen and an oxidizing gas containing oxygen to generate electricity. Examples of fuel cells include phosphoric acid fuel cells, molten carbonate fuel cells, oxide fuel cells, and polymer electrolyte fuel cells. [0003] A polymer electrolyte fuel cell (PEFC) can simultaneously generate electricity and heat by electrochemically reacting hydrogen-containing fuel gas, air, etc., and oxygen-containing oxidant gas. The combination of fuel gas and oxidant gas is also called reactive gas. [0004] PEFC is a fuel ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/92H01M8/10
CPCH01M4/8605H01M4/8882H01M8/1004Y02E60/521H01M4/8828H01M4/92Y02P70/50Y02E60/50
Inventor 泉伸太郎上木原伸幸渡边胜尾崎祐介小林美穗上山康博
Owner PANASONIC CORP