Patent ID: 8741488

Claim:
A lithium secondary battery comprising: an electrode consisting of: an electrode current collector layer; a first Si-containing material layer having a thickness of 0.005 μm to 1 μm formed on the electrode current collector layer; an electrode active material layer formed on the first Si-containing material layer; a second Si-containing material layer having a thickness of 0.005 μm to 1 μm formed on the electrode active material layer; and a porous film layer formed to surround the entire surfaces of the electrode, the Si-containing material layers each comprising a Si-containing compound of Formula II: wherein R 1 , R 2 and R 3 each independently represents a hydrogen atom, a halogen atom, a hydroxyl group, a substituted or unsubstituted amine group, a substituted or unsubstituted thiol group, a substituted or unsubstituted C 1 -C 20 alkyl group, a substituted or unsubstituted C 3 -C 20 cycloalkyl group, a substituted or unsubstituted C 1 -C 20 alkenyl group, a substituted or unsubstituted C 1 -C 20 alkoxy group, a substituted or unsubstituted C 6 -C 30 aryl group, a substituted or unsubstituted C 6 -C 30 aryloxy group, or a substituted or unsubstituted C 1 -C 20 alkylcarbonyl group; R 4 , R 5 and R 6 each independently represents a hydrogen atom, a halogen atom, a hydroxyl group, a substituted or unsubstituted amine group, —SH, a substituted or unsubstituted C 1 -C 20 alkyl group, a substituted or unsubstituted C 3 -C 20 cycloalkyl group, a substituted or unsubstituted C 1 -C 20 alkenyl group, a substituted or unsubstituted C 1 -C 20 alkoxy group, a substituted or unsubstituted C 6 -C 30 aryl group, a substituted or unsubstituted C 6 -C 30 aryloxy group, or a substituted or unsubstituted C 1 -C 20 alkylcarbonyl group; and X 1 is —O—, —NH—, a substituted or unsubstituted C 1 -C 20 alkylene group, a substituted or unsubstituted C 2 -C 20 alkenylene group, or a substituted or unsubstituted C 6 -C 30 arylene group; the porous film layer comprises a ceramic powder and a polymer resin, and the weight ratio of the ceramic powder and the polymer resin is 98:2 to 85:15.