A separator for a lithium secondary battery comprising: a substrate; a coating layer disposed on at least one surface of the substrate, wherein the coating layer comprises at least one metal oxide and/or at least one silicon oxide coated with at least one silane compound, wherein the at least one metal oxide and the at least one silicon oxide are particles, wherein the at least one silane compound has the formula: SiR 4-n X n, wherein n is from 1 to 3, each R is independently a C 1-20 alkyl group, a C 1-20 alkoxy group, an acetoxy group, a vinyl group or a halogen atom with the proviso that at least one R is a C 1-20 alkoxy group, an acetoxy group or a halogen atom, and each X is independently a C 1-20 alkyl group, a C 2-20 alkenyl group, a C 2-20 alkynyl group, a C 1-20 haloalkyl group, a C 1-20 alkoxy group, a C 6-24 aryl group, a C 6-25 aralkyl group, a C 5-20 heteroaromatic group, a C 3-20 cycloalkyl group or a C 4-20 alklycycloalkyl group, and each X is independently substituted with a reactive substituent, wherein the reactive substituent is selected from the group consisting of an amino group, an isocyanate group and an epoxy group and a combination thereof, wherein the coating layer further comprises a binder, wherein the binder comprises polyvinylidenefluoride (PVdF) modified to contain a -COOH group, or poly(vinylidene-hexafluoropropylene) (P(VdF-HFP)) modified to contain a - COOH group; wherein the sum of the metal oxide and the silicon oxide, and the binder are present in a weight ratio of between about 1.0:0.15 and 1.0:0.5; and wherein the at least one of the reactive substituents of the silane compound reacts with the -COOH group contained in the binder. a substrate; a coating layer disposed on at least one surface of the substrate, wherein the coating layer comprises at least one metal oxide and/or at least one silicon oxide coated with at least one silane compound, wherein the at least one metal oxide and the at least one silicon oxide are particles, wherein the at least one silane compound has the formula: SiR 4-n X n, wherein n is from 1 to 3, each R is independently a C 1-20 alkyl group, a C 1-20 alkoxy group, an acetoxy group, a vinyl group or a halogen atom with the proviso that at least one R is a C 1-20 alkoxy group, an acetoxy group or a halogen atom, and each X is independently a C 1-20 alkyl group, a C 2-20 alkenyl group, a C 2-20 alkynyl group, a C 1-20 haloalkyl group, a C 1-20 alkoxy group, a C 6-24 aryl group, a C 6-25 aralkyl group, a C 5-20 heteroaromatic group, a C 3-20 cycloalkyl group or a C 4-20 alklycycloalkyl group, and each X is independently substituted with a reactive substituent, wherein the reactive substituent is selected from the group consisting of an amino group, an isocyanate group and an epoxy group and a combination thereof, wherein the coating layer further comprises a binder, wherein the binder comprises polyvinylidenefluoride (PVdF) modified to contain a -COOH group, or poly(vinylidene-hexafluoropropylene) (P(VdF-HFP)) modified to contain a - COOH group; wherein the sum of the metal oxide and the silicon oxide, and the binder are present in a weight ratio of between about 1.0:0.15 and 1.0:0.5; and wherein the at least one of the reactive substituents of the silane compound reacts with the -COOH group contained in the binder. wherein the at least one metal oxide and the at least one silicon oxide are particles, wherein the at least one silane compound has the formula: SiR 4-n X n, wherein n is from 1 to 3, each R is independently a C 1-20 alkyl group, a C 1-20 alkoxy group, an acetoxy group, a vinyl group or a halogen atom with the proviso that at least one R is a C 1-20 alkoxy group, an acetoxy group or a halogen atom, and each X is independently a C 1-20 alkyl group, a C 2-20 alkenyl group, a C 2-20 alkynyl group, a C 1-20 haloalkyl group, a C 1-20 alkoxy group, a C 6-24 aryl group, a C 6-25 aralkyl group, a C 5-20 heteroaromatic group, a C 3-20 cycloalkyl group or a C 4-20 alklycycloalkyl group, and each X is independently substituted with a reactive substituent, wherein the reactive substituent is selected from the group consisting of an amino group, an isocyanate group and an epoxy group and a combination thereof, wherein the coating layer further comprises a binder, wherein the binder comprises polyvinylidenefluoride (PVdF) modified to contain a -COOH group, or poly(vinylidene-hexafluoropropylene) (P(VdF-HFP)) modified to contain a - COOH group; wherein the sum of the metal oxide and the silicon oxide, and the binder are present in a weight ratio of between about 1.0:0.15 and 1.0:0.5; and wherein the at least one of the reactive substituents of the silane compound reacts with the -COOH group contained in the binder.