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

The present invention relates to an electrolyte for a rechargeable lithium battery, comprising a lithium salt; an organic solvent comprising a fluorinated ether; and an additive. The additive comprises (i) a first lithium compound consisting of a lithium bis(sulfonyl)imide salt, and (ii) a second lithium compound consisting of a lithium ion and an anionic complex including at least one dicarboxylate ligand coordinated on a center atom.