Additive for lithium rechargeable battery and lithium rechargeable battery including the same

An additive for a rechargeable lithium battery, the additive being represented by Chemical Formula 1:

• wherein, in Chemical Formula 1,
• each X1 is independently hydrogen or a halogen atom;
• and
• A is a substituent represented by Chemical Formula 2, a substituent represented by Chemical Formula 3, a substituent represented by Chemical Formula 4, a substituent represented by Chemical Formula 5, or a substituted or unsubstituted C1 to C20 alkyl group;
• wherein, in Chemical Formula 2,
• Z1 is a carbon atom or a silicon atom,
• each L1 is independently a single bond or a substituted or unsubstituted C1 to C20 alkylene group;
• and
• each R1 is independently hydrogen, a substituted or unsubstituted C1 to C20 alkyl group, or a substituent represented by Chemical Formula 5;
• wherein, in Chemical Formula 3,
• Z2 is a nitrogen atom or a phosphorus atom;
• each L2 is independently a single bond or a substituted or unsubstituted C1 to C20 alkylene group;
• and
• each R2 is independently a hydrogen atom, a substituted or unsubstituted C1 to C20 alkyl group, or a substituent represented by Chemical Formula 5;
• *-L3—R3 [Chemical Formula 4]
• wherein, in Chemical Formula 4,
• L3 is a single bond, a disulfide bond, a substituted or unsubstituted C1 to C20 alkylene group, or a combination thereof;
• and
• R3 is a hydrogen atom, a substituted or unsubstituted C1 to C20 alkyl group, or a substituent represented by Chemical Formula 5;
• wherein, in Chemical Formula 5, each X2 is independently hydrogen or a halogen atom.