Additive, electrolyte for lithium secondary battery and lithium secondary battery including the same

An electrolyte for a lithium secondary battery, comprising:

• a lithium salt;
• a non-aqueous organic solvent;
• and
• an additive comprising a compound represented by Formula 1 below:
• wherein, in Formula 1,
• R1 to R4 are each independently a substituted or unsubstituted C1-C30 alkyl group or a substituted or unsubstituted C2-C30 alkenyl group, and
• a substituent of the substituted C1-C30 alkyl group or the substituted C2-C30 alkenyl group comprises at least one selected from a C1-C20 alkyl group, a C2-C20 alkenyl group, a C2-C20 alkynyl group, a C1-C20 alkoxy group, a halogen, a cyano group, a hydroxy group, and a nitro group.