An electrolyte for a lithium rechargeable battery comprising: (i) at least one non-aqueous organic solvent; (ii) at least one first lithium salt selected from the group consisting of LiPF 6, LiBF 4, LiBF 6, LiSbF 6, LiAsF 6, LiSO 3 CF 3, LiN(CF 3 SO 2) 2, LiN(C 2 F 5 SO 2) 2, LiClO 4, LiAlO 2, LiAlCl 4, or a combination thereof; (iii) at least one second lithium salt represented by Chemical Formula 3-1: R 7 and R 8 are each F, or R 7 and R 8 are linked to a substituent represented by Chemical Formula 2 to form a ring, R 9 and R 10 are linked to a substituent represented by the above Chemical Formula 2 to form a ring, and R 11 and R 12 are each F, R 5 and R 6 are each independently O or S, X and Y are each independently hydrogen or F, I and n are independently 0 or 1, and m is an integer ranging from 0 to 5; and (iv) at least one compound represented by Chemical Formula 9: A is S, O, or NR R is hydrogen, or a substituted or unsubstituted C 1 to C 20 alkyl group, and R 13 to R 16 are each independently hydrogen, a halogen, a substituted or unsubstituted C 1 to C 20 alkyl group, or a substituted or unsubstituted C 1 to C 20 alkoxy group, optionally R 14 and R 15 are linked by a substituent represented by Chemical Formula 2 to form a ring, wherein the compound represented by Chemical Formula 9 and the second lithium salt is mixed in a weight ratio ranging from 0.005:1 to 1:1. (i) at least one non-aqueous organic solvent; (ii) at least one first lithium salt selected from the group consisting of LiPF 6, LiBF 4, LiBF 6, LiSbF 6, LiAsF 6, LiSO 3 CF 3, LiN(CF 3 SO 2) 2, LiN(C 2 F 5 SO 2) 2, LiClO 4, LiAlO 2, LiAlCl 4, or a combination thereof; (iii) at least one second lithium salt represented by Chemical Formula 3-1: R 7 and R 8 are each F, or R 7 and R 8 are linked to a substituent represented by Chemical Formula 2 to form a ring, R 9 and R 10 are linked to a substituent represented by the above Chemical Formula 2 to form a ring, and R 11 and R 12 are each F, R 5 and R 6 are each independently O or S, X and Y are each independently hydrogen or F, I and n are independently 0 or 1, and m is an integer ranging from 0 to 5; and R 7 and R 8 are each F, or R 7 and R 8 are linked to a substituent represented by Chemical Formula 2 to form a ring, R 9 and R 10 are linked to a substituent represented by the above Chemical Formula 2 to form a ring, and R 11 and R 12 are each F, R 5 and R 6 are each independently O or S, X and Y are each independently hydrogen or F, I and n are independently 0 or 1, and m is an integer ranging from 0 to 5; and R 5 and R 6 are each independently O or S, X and Y are each independently hydrogen or F, I and n are independently 0 or 1, and m is an integer ranging from 0 to 5; and (iv) at least one compound represented by Chemical Formula 9: A is S, O, or NR R is hydrogen, or a substituted or unsubstituted C 1 to C 20 alkyl group, and R 13 to R 16 are each independently hydrogen, a halogen, a substituted or unsubstituted C 1 to C 20 alkyl group, or a substituted or unsubstituted C 1 to C 20 alkoxy group, optionally R 14 and R 15 are linked by a substituent represented by Chemical Formula 2 to form a ring, wherein the compound represented by Chemical Formula 9 and the second lithium salt is mixed in a weight ratio ranging from 0.005:1 to 1:1. A is S, O, or NR R is hydrogen, or a substituted or unsubstituted C 1 to C 20 alkyl group, and R 13 to R 16 are each independently hydrogen, a halogen, a substituted or unsubstituted C 1 to C 20 alkyl group, or a substituted or unsubstituted C 1 to C 20 alkoxy group, optionally R 14 and R 15 are linked by a substituent represented by Chemical Formula 2 to form a ring, wherein the compound represented by Chemical Formula 9 and the second lithium salt is mixed in a weight ratio ranging from 0.005:1 to 1:1.