COMPOSITE SEPARATOR FOR LITHIUM SECONDARY BATTERY AND MANUFACTURING THE SAME

The present invention relates to a composite separator for a lithium secondary battery, and an aqueous manufacturing method therefor, the composite separator comprising: a porous polymer substrate; a heat-resistant coating layer containing inorganic material formed on the surface of the porous polymer substrate; and a composite binder in which an organic-inorganic composite sol and an organic polymer are mixed, or an modified organic polymer binder, which bonds the porous polymer substrate and the heat-resistant coating layer, and a nonionic surfactant. Composite separators disclosed. in the present invention exhibits high air permeability, low thermal shrinkage, and excellent electrochemical characteristics.