SEPARATOR FOR LITHIUM SECONDARY BATTERY AND METHOD FOR MANUFACTURING SAME

A separator for an electrochemical device having a porous polymer substrate having a plurality of pores; and a porous coating layer formed on at least one surface of the porous polymer substrate. The porous coating layer comprises a dispersing agent a mixture of inorganic particles and a particle-type binder polymer; and a polyvinyl pyrrolidone binder polymer positioned on the whole or a part of the surface of the inorganic particles in the mixture of the porous coating layer to connect and fix the inorganic particles with one another. The content of the polyvinyl pyrrolidone binder polymer is 2 to 20 parts by weight based on 100 parts by weight of the total content of tire particle-type binder polymer and the polyvinyl pyrrolidone binder polymer. The separator has low resistance and a Lami strength equivalent or similar to the Lami strength of conventional separators without surface-treatment of a porous polymer substrate.