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Method for producing a separator

A technology for separators and plates, which is applied in the manufacture of final products, electrochemical generators, fuel cell components, etc. It can solve the problems of not optimal physical properties of the final plate, not optimal compression molding, and prolonging the production process, etc. , to achieve the effect of reducing PTFE agglomeration, reducing PTFE content and prolonging service life

Pending Publication Date: 2022-03-18
BLUE WORLD TECH HLDG APS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In practice, however, it has been shown that isopropanol may cause agglomeration of PTFE particles in aqueous dispersions during mixing, which may be desirable in some cases but requires relatively long stirring times, which from commercial Angle is not desired as it would prolong the production process
The use of isopropanol has another disadvantage: Due to its high flammability (because its flash point is only 12°C), the use of isopropanol requires strict safety rules and permanent controls, especially at elevated temperatures
However, in practice, neither the low nor the high temperature range was found to be optimal for compression molding, nor for the physical properties of the final board produced by such a process

Method used

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  • Method for producing a separator
  • Method for producing a separator
  • Method for producing a separator

Examples

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Embodiment Construction

[0043] Bipolar plates (BPP) are one of the key components of fuel cells as they act as separators in a single membrane electrode assembly, connecting them electrically in parallel and providing the voltage required by the stack as V stack =V1+V2+...+Vn-1+Vn, which is also figure 1 shown in .

[0044] An example of the production process is given by the following program. The flexible and extensible structure is provided by a fine powder mixture formed into a quasi-elastic mat and then thermally compacted into a separator, especially BPP.

[0045] During production, water is used instead of alcohol, especially isopropanol, to disperse the powder particles. The procedures described herein do not contain alcohol, especially isopropanol.

[0046] Although, as stated above, PTFE is a useful ingredient for bonding, its amount should be less than 50% by weight (wt%), and when used for conductive separators, should be less than 10wt%, as follows Explanation.

[0047] figure 2 A...

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Abstract

A separator is produced by providing a blend of powders comprising at least 70% by weight of carbon powder, 10% to 20% by weight of polyphenylene sulfide (PPS), and 0.005% to 10% by weight of polytetrafluoroethylene (PTFE) in an aqueous suspension; the suspension is heated to cause fibrillation of PTFE and evaporation of water to provide a malleable and pliable substance that is rolled to form a sheet material, and then the sheet material is hot compacted to form a separator.

Description

technical field [0001] The invention relates to a method for producing separators by thermal compaction. The invention also relates to separators obtainable by this method, such as bipolar plates for fuel cells. Background technique [0002] Bipolar plates (BPP) are one of the key components of some types of fuel cells because they act as separators for the SMAs by electrically connecting them in parallel and providing the voltage required by the stack. [0003] High temperature and strong acidic medium limit the utilization of metal BPP due to its corrosion tendency, while carbon materials, especially graphite, are attractive as metal substitutes. [0004] US6544680 discloses a molded separator with carbon and PPS but with the addition of a thermosetting resin. US6803139 discloses molded separators with carbon and thermoplastics such as polyphenylene sulfide (PPS) but with the addition of carbodiimide. EP1758185 discloses a molded separator with 84% carbon, 2% PTFE, 14% ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0226B29C43/00B29C48/00C08G75/0204C08L27/18C08L81/02H01M8/0213H01M8/0221
CPCH01M8/1048H01M8/0202H01M8/1046H01M8/0213H01M8/0221H01M8/0226Y02E60/50Y02P70/50H01M50/403H01M50/414H01M50/426H01M50/431H01M50/446H01M8/0234H01M8/0239H01M8/249
Inventor D·格罗马德斯基
Owner BLUE WORLD TECH HLDG APS
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