Separator, method of manufacturing separator, and electrochemical device including separator

A method of manufacturing a separator, the method comprising:

• (a) stirring a polar silane compound represented by the following Chemical Formula 1, inorganic particles, an acid component, an aqueous polymer binder, and water to prepare a coating slurry;
• and
• (b) applying the coating slurry prepared on at least one surface of a polyolefin-based porous substrate and drying the slurry to prepare an inorganic particle layer:
• AaSi(OR)b Chemical Formula 1
• wherein A is independently a polar functional group or a C1-C10 alkyl group having a polar functional group, R is independently hydrogen or a C1-C5 alkyl group, a is 1 to 2, b is 2 to 3, and a+b is 4,
• wherein the polar functional group includes any one or two or more of an amino group, an epoxy group, a carboxyl group, a hydroxyl group, an amide group, a thiol group, a ketone group, an ester group, and an aldehyde group, and
• wherein the polyolefin-based porous substrate is prepared by a hydrophilic surface treatment.