According to one aspect of the present invention there is provided a non-aqueous electrolyte for a rechargeable lithium battery comprising: - a first additive selected from one or more compounds represented by Chemical Formulae 1 and 2: wherein X', Y', and Z' are each independently hydrogen or Si(R c ) 3 , wherein R c is a C1 to C7 alkyl group, provided that X', Y', and Z' are not simultaneously hydrogen, A is B or P, and X", Y", and Z" are each independently hydrogen or Si(R d ) 3 wherein R d is a C1 to C7 alkyl group, provided that X", Y", and Z" are not simultaneously hydrogen; - a second additive selected from one or more compounds represented by Chemical Formulae 3 and 4: wherein in Chemical Formula 3, R e and R f are each independently a halogen, a halogen-substituted or unsubstituted C1 to C10 alkyl group, a halogen-substituted or unsubstituted C2 to C10 alkenyl group, or a halogen-substituted or unsubstituted C1 to C10 alkoxy group, and in Chemical Formula 4, R g , R h , R i , and R j are each independently a halogen, a halogen-substituted or unsubstituted C1 to C10 alkyl group, a halogen-substituted or unsubstituted C2 to C10 alkenyl group, or a halogen-substituted or unsubstituted C1 to C10 alkoxy group, or optionally at least two of R g , R h , R i , and R j are fused with each other to form an oxalate group; - a lithium salt; and - a non-aqueous organic solvent. The first and second additives are included at a weight ratio of 1:5 to 3:1.
