Patent ID: 8709651

Claim:
A lithium secondary battery comprising an electrode, wherein the electrode comprises: an electrode mixture including an electrode active material, a conductive material, and a binder; and an electrode collector, wherein the electrode active material and the conductive material are bonded to the electrode collector by the binder, wherein the binder comprises: a copolymer, the copolymer consisting of: (i) 79 to 98% by weight of (a) an ethylenically unsaturated carbonic acid ester monomer and (b) at least one selected from the group consisting of a vinyl monomer and a nitrile monomer; (ii) 1 to 20% by weight of an ethylenically unsaturated carbonic acid monomer; and (iii) 1 to 20% by weight of a phosphorus (P)-containing monomer including a P═O bond and one or more reactive double bonds in a molecular structure thereof, based on the total weight of the binder, and wherein an adhesion strength between the electrode mixture and the collector ranges from 30 grams per inch (g/in) to 86 g/in, wherein the adhesive strength was measured by attaching the electrode to a glass surface and measuring the adhesion strength as the electrode collector is peeled away from the electrode mixture at 180° C.