Electrolyte solution for lithium secondary battery and lithium secondary battery employing the same

The rechargeable lithium battery including the electrolyte, and this lithium secondary battery is disclosed. To is disclosed a lithium secondary battery electrolyte of organic ester compound represented by the formula (1); An organic solvent; And a lithium salt: Formula 1 In Formula 1, R The general formula (1) of, R [Formula 2] In the formula 2, R 'is a C1-C10 alkyl group.