Non-aqueous electrolyte for lithium secondary battery and lithium secondary battery comprising same

A non-aqueous electrolyte for a lithium secondary battery, the electrolyte comprising:

• a non-aqueous organic solvent;
• a lithium salt;
• a first additive comprising at least one of compounds represented by Chemical Formulae 1 to 4;
• and
• a second additive including a compound represented by Chemical Formula 5 or 6:
• wherein, in Chemical Formulae 1 to 4,
• R1 to R8 are independently a substituted or unsubstituted, primary, secondary, or tertiary alkyl group, a substituted or unsubstituted alkenyl group, or a substituted or unsubstituted aryl group,
• R9 is a substituted or unsubstituted, primary, secondary, or tertiary alkyl group or a substituted or unsubstituted aryl group,
• X is hydrogen or a halogen atom,
• n is an integer of 0 to 3, and
• m1 and m2 are independently an integer of 0 to 3,
• wherein, in Chemical Formulae 5 and 6,
• R10 to R27 are independently a substituted or unsubstituted, primary, secondary, or tertiary alkyl group, a substituted or unsubstituted alkenyl group, or a substituted or unsubstituted aryl group.