Patent ID: 8101303

Claim:
A rechargeable lithium battery comprising: a positive electrode including a positive active material being capable of intercalating and deintercalating lithium ions, the positive electrode having an active mass density of 3.65 g/cc or more; a negative electrode including a negative active material being capable of intercalating and deintercalating lithium ions; and an electrolyte including a non-aqueous organic solvent and a lithium salt, the lithium salt comprising lithium hexafluorophosphate (LiPF 6 ), lithium tetrafluoroborate (LiBF 4 ), and a lithium imide-based compound, wherein the LiBF 4 is present in an amount of 0.05 to 0.5 wt % based on the total weight of the electrolyte, and the lithium imide-based compound is present at a 0.1 to 0.7M concentration in the electrolyte.