Electrolyte for rechargeable lithium battery and rechargeable lithium battery

A rechargeable lithium battery comprising:

• a positive electrode comprising a positive active material;
• a negative electrode comprising a negative active material;
• and
• a non-aqueous electrolyte, comprising:
• a non-aqueous organic solvent,
• a lithium salt, and
• an additive including vinylene carbonate, fluoroethylene carbonate, and a nitrile-based compound selected from the group consisting of succinonitrile, glutaronitrile, adiponitrile, pimelonitrile, suberonitrile, and combinations thereof,
• wherein the vinylene carbonate is present at an amount of 0.01 to 9 wt % based on the total weight of the electrolyte,
• wherein the fluoroethylene carbonate is present at an amount of 0.1 to 7 wt % based on total weight of the electrolyte, and
• wherein the nitrile-based compound is present at an amount of 0.005 to 10 wt % based on the total weight of the electrolyte.