| abstract |
A substrate and a coating layer disposed on at least one side of the substrate, the coating layer including first and second organic particles, and the average particle diameter of the first organic particles is greater than the average particle diameter of the second organic particles , The first organic particles protrude from the surface of the coating layer to a height of 0.1 to 0.5 μm, and are distributed on the surface of the coating layer at an area ratio corresponding to 5% or more and less than 30% of the surface area of the coating layer. When the separator is used, it has improved adhesion to an electrode, insulation, and air permeability, and lifespan characteristics of a lithium battery may be improved. |