Membrane-electrode assembly and method for manufacturing same

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.