abstract |
A lithium secondary battery having An operating voltage of 4.35V includes a cathode including a doped LiCoO 2 active material; an anode including graphite; and an electrolyte including a carbonate-based solvent, a lithium salt, and succinonitrile (SN ) And bis (oxalato) lithium borate (LiBOB) additives, in which the discharge from 100% charge state (SOC) at 4.5V to 0% SOC at 3V at 45 ° C During this period, the difference between the SOC at 4.42V and the SOC at 4.35V was at least 7%, but less than 14%, and the active material was subjected to at least 0.5 mole% of Mn, Mg, and Ti.者 DUPIED. |