Organic / inorganic porous composite separator with porous active coating layer and electrochemical device containing the same

摘要

An organic / inorganic composite separator comprising: (a) a porous polyolefin substrate with pores; (b) a porous active layer containing a mixture of inorganic particles and a binder polymer with which at least one surface of the porous polyolefin substrate is coated, the porous active layer having a peel force of 5 gf / cm or more and thermal shrinkage of the separator, after standing at 150 ° C for one hour, is 50% or less in a machine direction (MD) or in a transverse direction (TD).