| abstract |
The present invention provides a non-aqueous electrolyte solution comprising a non-aqueous organic solvent, a quinone-based lithium salt, and an additive selected from the group consisting of: an electrolyte solution additive: lithium difluorobisphosphonic acid lithium phosphate (LiDFOP) , (trimethyl decyl) propyl phosphate (TMSPa), 1,3-propene sultone (PRS), and ethyl sulphate (ESa).nAn electrolyte solution additive for a lithium secondary battery according to the present invention, which can improve high-low temperature output characteristics and prevent bulging, and suppress bulging by inhibiting PF6-decomposition on a cathode surface (possibly occurring in a The high temperature cycle of the lithium secondary battery of the electrolyte solution additive) and the oxidation reaction of the electrolyte solution are prevented. |