Patent ID: 7655358

Claim:
A rechargeable lithium battery comprising: a positive electrode including a positive active material comprising a lithiated transition metal compound, and an additive, said additive at least one of Si, B, Ge, Ga, Ca, Sr, and Ba or oxides thereof; a negative electrode including a carbonaceous material as an active material; and an electrolyte including an organic solvent and a lithium salt dissolved in the organic solvent, wherein the additive is 0.01 to 10 wt % of the positive active material, wherein the lithiated transition metal compound is selected from the group consisting of compounds represented by formulas 1 to 13: Li x MnA 2 (1) Li x MnO 2−z A z (2) Li x Mn 1−y M′ y A 2 (3) Li x Mn 2 A 4 (4) Li x Mn 2 O 4−z A z (5) Li x Mn 2−y M′ y A 4 (6) Li x BA 2 (7) Li x BO 2−z A z (8) Li x B 1−y M″ y A 2 (9) Li x B 1−y M″ y O 2−z A z (10) Li x NiCoA 2 (11) Li x NiCoO 2−z A 2 (12) Li x Ni 1−y−z Co y M″ z A 2 (13) wherein 1.0≦x≦1.1, 0.01≦y≦0.1, 0.01≦z≦0.5, M′ is at least one transition metal or lanthanide metal selected from the group consisting of Al, Cr, Co, Mg, La, Ce, Sr and V, M″ is at least one transition metal or lanthanide metal selected from the group consisting of Al, Cr, Mn, Fe, Mg, La, Ce, Sr and V, A is selected from O, F, S or P, and B is Ni or Co.