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

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

• an ionizable lithium salt;
• an organic solvent;
• and
• an additive for a non-aqueous electrolyte solution,
• wherein the additive for a non-aqueous electrolyte solution comprises a compound represented by Formula 1:
• NC—(R)n—CN, [Formula 1]
• wherein in Formula 1, R is a cycloalkylene group having 3 to 5 carbon atoms, which is substituted with at least one cyano group (—CN);
• a haloalkylene group having 2 to 5 carbon atoms, which is substituted with at least one cyano group (—CN);
• or —R2—C(CN)2—R3—, wherein R2 and R3 are each independently an alkylene group having 1 to 3 carbon atoms, and at least one of R2 and R3 is an alkylene group having 1 carbon atom, and
• n is an integer of 1 to 5.