A SEPARATOR HAVING POROUS COATING LAYER, AND ELECTROCHEMICAL DEVICE CONTAINING THE SAME

摘要

PURPOSE: A separator with a porous coating layer is provided to increase the output of an electrochemical device when minimizing the generation of leak current, and to ensure excellent thermal stability. CONSTITUTION: A separator includes: a monolayer-type polyolefin-based microporous film having a porosity of 40 to 60%, a mean pore diameter of 60 nm or smaller, and an air permeability of 350s/100mL or lower; and a porous coating layer formed on at least one side of the microporous film, and composed of a mixture of inorganic particles and binder polymers. An electromechanical device having the separator of the present invention has an excellent thermal stability, and generates a high output while minimizing leakage current.