Electrolyte and rechargeable lithium battery including same

A rechargeable lithium battery comprising:

• a positive electrode,
• a negative electrode and,
• an electrolyte comprising:
• a lithium salt,
• a non-aqueous organic solvent, and
• an additive represented by the following Chemical Formula 1:
• wherein, R1 to R3 are the same or different, and are independently hydrogen, substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C1 to C10 alkenyl group, a substituted or unsubstituted C3 to C20 cycloalkyl group, a substituted or unsubstituted C3 to C20 cycloalkenyl group, a substituted or unsubstituted C6 to C30 aryl group, or a substituted or unsubstituted C2 to C30 heteroaryl group, and at least one of R1 to R3 is a substituted or unsubstituted C1 to C10 alkenyl group, or a substituted or unsubstituted C3 to C20 cycloalkenyl group,
• wherein the additive represented by the above Chemical Formula 1 is included in an amount of about 0.01 wt % to about 3 wt % based on the total amount of the electrolyte for a rechargeable lithium battery,
• wherein the electrolyte comprises fluoroethylene carbonate in an amount of about 0.1 wt % to about 10 wt % based on the total amount of the electrolyte for a rechargeable lithium battery, and
• wherein the electrolyte comprises lithium tetrafluoro borate in an amount of about 0.01 wt % to about 2 wt % based on the total amount of the electrolyte for the rechargeable lithium battery.