Patent ID: 9728805
Date: 2017-08-08
CPC Classifications: H01M,Y02E

Claim:
1. A lithium secondary battery, comprising: an electrode assembly having an anode, a cathode, and a separator interposed between the cathode and the anode; and a nonaqueous electrolyte injected into the electrode assembly, wherein the nonaqueous electrolyte is the nonaqueous electrolyte for a lithium secondary battery which includes an electrolyte salt and an organic solvent, and a polymeric film formed on the electrode assembly formed with a hetero polycyclic compound, wherein the nonaqueous electrolyte further includes the hetero polycyclic compound, wherein the hetero polycyclic compound is at least one type of compound expressed by Chemical Formulas 2 to 4 below: wherein X provided that compounds wherein one of X provided that compounds wherein all of X wherein, in a case where X wherein, in a case where X wherein R wherein Y is a single bond, oxygen or sulfur, wherein X wherein X wherein, in a case where X wherein R wherein Y is a single bond, oxygen or sulfur, wherein X provided that compounds wherein all of X wherein, in a case where X wherein, in a case where X wherein R wherein the cathode has a cathode layer which includes a lithium-containing oxide, wherein the lithium-containing oxide is a lithium-containing transition metal oxide, and wherein the lithium-containing transition metal oxide is selected from the group consisting of LiCoO