Non-aqueous Electrolyte Solution And Lithium Secondary Battery Including The Same

The present invention relates to a non-aqueous electrolyte solution including a non-aqueous organic solvent, a lithium salt, and an oligomer represented by Formula 1 described in the present specification, and a lithium secondary battery including the same. Since the non-aqueous electrolyte solution according to an embodiment of the present invention may reduce gas, such as CO or CO, generated in the secondary battery during high-temperature storage, it may further improve high-temperature stability of the lithium secondary battery.