SEPARATOR FURNISHED WITH POROUS COATING LAYER, METHOD OF MANUFACTURING SAME, AND ELECTROCHEMICAL DEVICE FURNISHED THEREWITH

摘要

The separator of the present invention comprises a flat woven fabric substrate having a number of pores; and a porous coating layer that is provided on at least one face of said woven fabric and is formed with a mixture of a number of inorganic particles and a binder polymer, wherein said woven fabric substrate is formed with an ultra-fine fiber having an average thickness of 0.5 to 10 µm and contains, with respect to the total number of pores, 50% or more of pores having a wide diameter within the range from 0.1 to 70 µm. A separator furnished with a porous coating layer according to the present invention employs the woven fabric substrate whose pore sizes have been controlled using the ultra-fine fiber of a certain thickness, and can thereby prevent the generation of leakage current without increasing the loading weight of the porous coating layer.