Patent ID: 8318360

Claim:
A manufacturing method of the organic/inorganic composite porous separator comprising the steps of: (a) dispersing inorganic precursors and heat-decomposable compounds in a dispersion medium, misting the inorganic precursor solution, and performing a thermal decomposition and a crystallization process, to thereby prepare inorganic porous particles, wherein the inorganic porous particles have a plurality of macropores, said macropores having a diameter of 50 nm or greater in the particle itself thereby forming a pore structure; (b) adding and mixing the inorganic porous particles obtained from step (a) with a polymer solution containing a binder polymer; and (c) coating the mixture obtained from step (b) on at least one region selected from the group consisting of a surface of a porous substrate having pores and a part of the pores in the porous substrate, following by drying.