Separator for secondary battery, manufacturing method therefor, and lithium secondary battery comprising same

A method of manufacturing a separator for a secondary battery, the method comprising:

• mixing fluorine-based polymer particulates and (meth) acrylic polymer particulates in a weight ratio of 90:10 to 50:50 to prepare a coating layer composition;
• coating the coating layer composition on at least one surface of a porous substrate by an inkjet coating method to form a coating layer, such that the coating layer includes a plurality of ring patterns on the at least one surface of the porous substrate,
• wherein:
• the ring patterns are spaced apart from each other at regular intervals,
• a diameter of each of the ring patterns is 10 μm to 200 μm, and
• a thickness of each of the ring patterns is 0.2 μm to 1.5 μm.