US 11,749,810 B2
Gas diffusion layer, membrane electrode assembly, and fuel cell
Umi Yamamoto, Otsu (JP); Masamichi Utsunomiya, Otsu (JP); Isamu Shigemoto, Otsu (JP); and Yasuaki Tanimura, Otsu (JP)
Assigned to TORAY INDUSTRIES, INC., Tokyo (JP)
Appl. No. 17/276,926
Filed by Toray Industries, Inc., Tokyo (JP)
PCT Filed Jun. 28, 2019, PCT No. PCT/JP2019/025767
§ 371(c)(1), (2) Date Mar. 17, 2021,
PCT Pub. No. WO2020/066191, PCT Pub. Date Apr. 2, 2020.
Claims priority of application No. 2018-183744 (JP), filed on Sep. 28, 2018.
Prior Publication US 2022/0037674 A1, Feb. 3, 2022
Int. Cl. H01M 8/10 (2016.01); H01M 4/88 (2006.01); H01M 8/1004 (2016.01)
CPC H01M 4/8807 (2013.01) [H01M 8/1004 (2013.01); H01M 2008/1095 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A gas diffusion layer comprising a carbon sheet and a microporous layer disposed on at least one surface of the carbon sheet, and meeting the requirement “C is equal to or greater than 0”, wherein:
C, which is referred to as “index for simultaneous realization of a required in-plane oxygen permeation coefficient and electrical resistance”, is calculated by subtracting the product of B multiplied by 60 from A and adding 310 to the difference,
A, which is referred to as “in-plane oxygen permeation coefficient”, is the rate of oxygen permeation in an in-plane direction in a gas diffusion layer that occurs when a pressure of 0.5 MPa is applied in the through-plane direction to a surface of the gas diffusion layer to compress an arbitrarily selected region having a width of 10 mm and a depth of 3 mm in the gas diffusion layer, and
B is the “electrical resistance” that occurs when the gas diffusion layer is compressed by applying a pressure of 2 MPa in the through-plane direction.