abstract |
A lithium secondary battery having an operating voltage of □ 4.35 V, comprising: a cathode comprising a doped LiCoO 2 active material; an anode comprising graphite; and an electrolyte comprising a carbonate-based solvent, Lithium salt, and succinonitrile (SN) and bis(oxalate) lithium borate (LiBOB) additives, at 45 ° C, at C/10 rate, from 100% state of charge (SOC) at 4.5V to During the discharge of 0% SOC at 3V, the difference between the SOC at 4.42V and the SOC at 4.35V is at least 7%, but less than 14%, and wherein the active material passes at least 0.5 mol% of Mn, Mg. And one or more of Ti are doped. |