Separation membrane for secondary battery including double porous coating layer of inorganic particles having different surface characteristics, secondary battery including the same, and method for producing separation membrane

摘要

The present disclosure relates to a separator for a secondary battery including a dual porous coating layer of inorganic particles with different surface characteristics, a secondary battery including the same, and a method of manufacturing the separator. According to an exemplary embodiment of the present disclosure, a separator for a secondary battery including a porous substrate, a first porous coating layer, and a second porous coating layer is provided. According to another exemplary embodiment of the present disclosure, a method of manufacturing a separator for a secondary battery including forming a first slurry, forming a second slurry, forming a first porous coating layer, and forming a second porous coating layer is provided. A separator according to an aspect of the present disclosure has uniform dispersion of inorganic particles in a coating layer of the separator, and adsorbs an excess of metal ions generated in the battery when the battery is out of a normal operating temperature range, thereby ensuring safety of the battery.