Method For Manufacturing Lithium Secondary Battery Separator, Lithium Secondary Battery Separator Manufactured Thereby, And Lithium Secondary Battery Comprising Same

Abstract: The present invention provides a method for manufacturing a lithium secondary battery separator, comprising the steps of: (S1) adding a binder polymer and inorganic particles to a solvent and mixing same, thereby preparing a slurry in which the binder polymer is dissolved and the inorganic particles are dispersed; and (S2) coating, with the slurry, at least one surface of a porous polyolefin polymer substrate having a plurality of pores, and drying same, thereby forming a porous coating layer, wherein the thickness of the porous polyolefin polymer substrate is 9 µm or less, D90 of the inorganic particles dispersed in the slurry is 3 µm or less, and surface roughness Ra of the porous coating layer is 50-500 nm.

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