Patent ID: 7745053

Claim:
A lithium secondary battery comprising; a positive electrode comprising a positive active material capable of intercalating and deintercalating lithium ions; a negative electrode comprising a negative active material capable of intercalating and deintercalating lithium ions; and a polymer electrolyte comprising a polymer, a non-aqueous organic solvent, and a lithium salt, the polymer electrolyte having a shear strength relative to the positive electrode of about 0.7 N/mm or greater, the polymer comprising: a first monomer represented by a polyesterpolyol of Formula 1: A-polyesterpolyol-B (1) wherein the polyesterpolyol is produced by condensation of at least one alcohol derivative having from 2 to 6 OH groups and at least one dicarboxylic acid derivative, the polyesterpolyol having a weight average molecular weight ranging from about 100 to about 10,000,000, and each of A and B are linked to terminal OH groups of the polyesterpolyol, each of A and B being selected from the group consisting of CH 2 ═CR—C(═O)—, CH 2 ═CR—C—CH 2 —, CH 2 ═CR—, CH 2 ═CR—O—C(═O)—, CH 2 ═CH—CH 2 —O—, CH 2 ═CH—S(═O) 2 —, or CH 2 ═CR—C(═O)—O—CH 2 CH 2 —NH—C(═O)—, wherein R is selected from the group consisting of C 1 to C 10 hydrocarbons and C 6 to C 10 aromatic hydrocarbons; and a second monomer selected from the group consisting of ethylene glycol methylether acrylate, Formulas 2 through 7, and combinations thereof: CH 2 ═CR1-C(═O)—O—X (2) CH 2 ═CR1-O—X (3) CH 2 ═CR1-O—C(═O)—X (4) CH 2 ═CH—CH 2 —O—X (5) CH 2 ═CH—S(═O) 2 —X (6) CH 2 ═CR1-C(═O)—O—CH 2 CH 2 —NH—C(═O)—O—X (7) wherein R1 is selected from the group consisting of H, C 1 to C 10 hydrocarbons and C 1 to C 10 aromatic hydrocarbons, and X is selected from the group consisting of C 1 to C 20 hydrocarbons, C 1 to C 20 halogenated hydrocarbons, C 1 to C 20 aromatic hydrocarbons and C 1 to C 20 halogenated aromatic hydrocarbons.