Separator including inorganic porous coating layer including polar binder and acrylic binder with different glass transition temperatures, electrochemical device, and method for manufacturing the same

A separator for an electrochemical device, comprising:

• a porous separator substrate, and
• a porous coating layer on at least one surface of the porous separator substrate,
• wherein the porous coating layer comprises inorganic particles and a binder resin at a weight ratio of 50:50 to 99:1,
• wherein the binder resin comprises a first binder resin, a second binder resin and a third binder resin,
• wherein the first binder resin has a glass transition temperature (Tg) of 30° C. to 60° C. and comprises polyvinyl acetate,
• wherein the second binder resin has a glass transition temperature (Tg) of 80° C. to 120° C. and comprises polymethyl methacrylate,
• wherein the third binder resin comprises polyacrylonitrile,
• wherein the first binder resin is present in an amount of more than 70 wt % to 90 wt % based on 100 wt % of the binder resin, and
• wherein the second binder resin is present in an amount of 10 wt % to 21.1 wt % based on 100 wt % of the binder resin.