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Polymer electrolyte fuel cell and manufacturing method

A solid polymer, fuel cell technology, used in solid electrolyte fuel cells, fuel cells, fuel cell components and other directions, can solve the problem of difficult to form hole diameter and other issues

Inactive Publication Date: 2006-12-27
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, in the first conventional fuel cell manufacturing method, two kinds of large and small carbon particles having different particle diameters are mixed, but there is a problem that the small-diameter particles enter the pores formed by the large-diameter particles and it is difficult to Problems forming hole diameters as specified by design

Method used

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  • Polymer electrolyte fuel cell and manufacturing method
  • Polymer electrolyte fuel cell and manufacturing method
  • Polymer electrolyte fuel cell and manufacturing method

Examples

Experimental program
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Embodiment 1

[0046] (Preparation for forming a gas diffusion layer on the surface of the intermediate layer)

[0047]Carbon paper (manufactured by Toray: TGP-H-090) was dipped in a polytetrafluoroethylene (PTFE) aqueous dispersion (manufactured by Daikin Industries) diluted solution, dried and then heat-treated at 360°C to make it water-repellent. gas diffusion layer. Acetylene black (Denki Kagaku Kogyo Co., Ltd.: Denka Gas Black) as an electronically conductive filler with an average particle size of primary particles of about 35 nm, PTFE aqueous dispersion, nonionic dispersant, and 2 as a thickener % hydroxyethyl cellulose (HEC) aqueous solution, distilled water as a solvent mixed and dispersed slurry, add polymethyl methacrylate (PMMA) spherical particles with an average particle size of 8 μm as a heat-disappearing filler Hydration product industrial production: Techpolymer), make the solid portion ratio (the volume ratio of the PMMA particles in the slurry) reach 80%. After the slurr...

Embodiment 2

[0056] The production and operation of the battery were the same as in Example 1, except that PMMA particles with an average particle size of 8 μm were added as a heat-dissipating filler to make the solid content 50% during the production of the intermediate layer. At this time, when the air permeability of the carbon paper with the intermediate layer was measured with an air permeability meter, it was about 100 μm / (Pa·s). When a thin film consisting of only this intermediate layer is produced and the pore diameter distribution is measured, the volume ratio of pores with a pore diameter of 1 μm or more and 30 μm or less occupies about 50% of the volume of the entire intermediate layer. In addition, the solid volume ratio was 30%. Table 1 shows changes in battery voltage and battery resistance.

Embodiment 3

[0058] The production and operation of the battery were the same as in Example 1, except that PMMA particles with an average particle size of 8 μm were added as a heat-dissipating filler to make the solid content ratio 87%. At this time, when the air permeability of the carbon paper with the intermediate layer was measured with an air permeability meter, it was about 230 μm / (Pa·s). When a film consisting of only this intermediate layer was produced and the pore diameter distribution was measured, the volume ratio of pores with a pore diameter of 1 μm or more and 30 μm or less occupied about 87% of the volume of the entire intermediate layer. In addition, the solid volume ratio was 5%. Table 1 shows changes in battery voltage and battery resistance.

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Abstract

The present invention provides a solid polymer electrolyte fuel cell and manufacturing method thereof. An intermediate layer is disposed between respective gas diffusing layers and catalyst layers of a polymer electrolyte fuel cell. This intermediate layer is mainly an electron-conductive filler and a binder, and has voids that are continuous in a thickness direction inside the intermediate layer, the intermediate layer has a solid volume percentage that is at least 3 percent and no larger than 30 percent, and a volume ratio occupied by voids that have a void diameter that is at least 1 mum and no larger than 30 mum of at least 50 percent of overall intermediate layer volume.

Description

technical field [0001] The present invention relates to a solid polymer fuel cell and a method for manufacturing the same. Specifically, it relates to a fuel cell having the ability to efficiently and continuously supply gas to the catalyst layer, improve cell efficiency, and improve the adhesion between the catalyst layer and the gas diffusion layer. An improved interlayer solid polymer fuel cell and a manufacturing method thereof. Background technique [0002] In recent years, clean power generation systems have been demanded due to increased awareness of environmental issues, and fuel cells have attracted attention as one of such systems. The types of electrolytes used in this fuel cell include phosphoric acid type, molten carbonate type, solid electrolyte type, and solid polymer type, etc. Among them, the research on the solid polymer type that has advantages in low power generation temperature and miniaturization Development is going on vigorously. [0003] This solid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/10H01M8/02H01M4/86H01M4/88
CPCH01M8/0245H01M8/0234H01M4/8657Y02E60/50H01M8/1002H01M8/1007Y02P70/50
Inventor 相原茂福本久敏西村隆滨保昌之
Owner MITSUBISHI ELECTRIC CORP
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