SEPARATOR FOR SECONDARY BATTERY, SECONDARY BATTERY INCLUDING THE SAME, AND MANUFACTURING METHOD OF SECONDARY BATTERY

Disclosed is a separator for a secondary battery that improves the stability of the secondary battery. In one embodiment of the present disclosure, the separator includes: a porous substrate; and a coating layer disposed on at least one surface of the porous substrate. The coating layer includes polyvinylidene fluoride-co-hexafluoropropylene (PVDF-HFP) and inorganic particles. In the coating layer, the PVDF-HFP has a lamellar thickness of 2.5 to 3.2 nm.