US 12,347,905 B2
Membrane-electrode assembly and method for manufacturing same
Jung Ho Kim, Seoul (KR); Jun Young Kim, Seoul (KR); Kah-Young Song, Seoul (KR); Nakwon Kong, Seoul (KR); Jusung Lee, Seoul (KR); Kyoungsik Nam, Seoul (KR); and Chanmi Park, Seoul (KR)
Assigned to KOLON INDUSTRIES, INC., Seoul (KR)
Appl. No. 17/758,572
Filed by KOLON INDUSTRIES, INC., Seoul (KR)
PCT Filed Dec. 1, 2021, PCT No. PCT/KR2021/017999
§ 371(c)(1), (2) Date Jul. 9, 2022,
PCT Pub. No. WO2022/131629, PCT Pub. Date Jun. 23, 2022.
Claims priority of application No. 10-2020-0176531 (KR), filed on Dec. 16, 2020.
Prior Publication US 2023/0057062 A1, Feb. 23, 2023
Int. Cl. H01M 8/1004 (2016.01); H01M 4/88 (2006.01)
CPC H01M 8/1004 (2013.01) [H01M 4/881 (2013.01); H01M 4/8828 (2013.01); H01M 4/8882 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method of manufacturing a membrane-electrode assembly, the method comprising:
dispersing a first catalyst and a first ion conductor in a first dispersion medium in order to obtain a first catalyst slurry;
coating the first catalyst slurry on a first surface of a polymer electrolyte membrane; and
drying the first catalyst slurry coated on the first surface in order to form a first electrode, wherein
the first dispersion medium comprises (i) a first ingredient capable of partially melting the polymer electrolyte membrane at the first surface thereof or causing deformation of the first surface to form a plurality of grooves on the first surface and (ii) a second ingredient different from the first ingredient,
the first ingredient is alcohol, acetic acid, propionic acid, dimethylacetamide, or a mixture of two or more thereof,
the alcohol is methanol, ethanol, propanol, ethoxyethanol, butanol, or a mixture of two or more thereof,
the second ingredient is water, N-methyl pyrrolidone (NMP), dimethyl sulfoxide (DMSO), tetrahydrofuran (THF), or a mixture of two or more thereof,
a content of the first dispersion medium in the first catalyst slurry is 83 to 98 wt. %,
a content of the first ingredient in the first dispersion medium is 55 to 80 wt. %, and
when the first electrode is formed through the drying step, at least some of the grooves are filled with the first catalyst, the first ion conductor, or a mixture thereof.