Patent ID: 8372475

Claim:
A method for preparing a cross-linked ceramic-coated separator containing an ionic polymer, the method comprising: (a) preparing a polymer solution by dissolving an ionic polymer in a solvent; (b) preparing an inorganic dispersion solution by dispersing ceramic particles for improving thermal and mechanical characteristics and a functional inorganic compound for forming a conductive solid electrolyte interface during charge/discharge in a solvent; (c) preparing a coating material by adding a curing agent and an initiator to the two solutions prepared in steps (a) and (b) and uniformly mixing the resulting solution; (d) coating the coating material prepared in step (c) on one or both sides of a porous membrane substrate and drying the resulting substrate; (e) preparing a chemically cross-linked separator by chemically cross-linking the substrate obtained in step (d) by thermal polymerization or ultraviolet irradiation; and (f) drying the thus prepared separator.