SEPARATOR FOR ELECTROCHEMICAL DEVICE AND ELECTROCHEMICAL DEVICE CONTAINING SAME

A separator for an electrochemical device, including: a porous polymer substrate having a plurality of pores; and a porous coating layer on at least one surface of the porous polymer substrate, wherein the porous coating layer comprises boehmite particles and a binder polymer, wherein the binder polymer is positioned on at least a part of the surface of the boehmite particles and connects and fixes the boehmite particles with one another. The boehmite particles have an average particle diameter of 2.0 μm to 3.5 μm and a specific surface area of 4.0 m/g to 4.5 m/g, and one side of the porous coating layer has a thickness of 2 μm to 10 μm.