Gas diffusion layer for fuel cell, manufacturing method therefor, membrane electrode assembly, and fuel cell
AssigneePanasonic Corporation
InventorsMasaki Yamauchi, Yoichiro Tsuji
Life of this patent
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Abstract
A gas diffusion layer for fuel cell of the present invention is structured with a porous member mainly comprised of conductive particles such as acetylene black, graphite and a polymer resin such as PTFE. This makes it possible to achieve both an improvement in power generation performance of the fuel cell and a reduction in costs.
Claims20
A gas diffusion layer used for a fuel cell, wherein the gas diffusion layer is structured with a porous member whose principal components are conductive particles (excluding conductive particles modified with boron) and a polymer resin, with carbon fibers added by a weight smaller than a weight of the polymer resin, and
- the porous member includes the carbon fibers by 2.0 weight percent or more and 7.5 weight percent or less, and includes the polymer resin by 10 weight percent or more and 17 weight percent or less.
A manufacturing method of a gas diffusion layer used for a fuel cell, comprising:
- mixing conductive particles (excluding conductive particles modified with boron), a polymer resin, carbon fibers, a surfactant, and a dispersing solvent;
- rolling a mixture obtained by the mixing to mold the mixture to be sheet-like;
- calcining the sheet-like molded mixture to remove the surfactant and the dispersing solvent from the mixture;
- and
- re-rolling the mixture from which the surfactant and the dispersing solvent are removed to adjust a thickness of the mixture, wherein
- a mix ratio of the carbon fibers in the mixture re-rolled to have the thickness adjusted in the re-rolling is 2.0 weight percent or more and 7.5 weight percent or less, and a mix ratio of the polymer resin in the mixture re-rolled is 10 weight percent or more and 17 weight percent or less.
Dependencies are inferred from the claim text.