Electrolyte for rechargeable lithium battery, and rechargeable lithium battery including the same

The present invention provides an electrolyte for a rechargeable lithium battery, which includes at one first lithium salt; at least one second lithium salt including a compound represented by Chemical Formula 1, Chemical Formula 3-1 or Chemical Formula 3-2, or a combination thereof; at least one nonaqueous organic solvent; and at least one additive including a compound represented by the following Chemical Formula 9, and a rechargeable lithium battery including the same.