SECONDARY BATTERY SEPARATOR COMPRISING DISPERSANT, AND MANUFACTURING METHOD THEREFOR

Disclosed herein is a separator for a secondary battery comprising a porous separator substrate including a polyolefin-based material and a coating layer coated on at least one surface of the separator substrate, the separator for a secondary battery having a uniform coating layer and improved adhesion force, wherein the coating layer is a dry form of a slurry comprising a binder, an inorganic material, a mixed solvent including at least two solvents, and a dispersant, the inorganic material being a metal hydroxide and the dispersant being a compound including 10 to 30 hydroxy groups in one molecule.