Non-aqueous electrolyte solution additive, and non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery which include the same

A non-aqueous electrolyte solution additive comprising at least one selected from the compounds represented by Formulae 2a to 2c:

• wherein, in Formula 2a,
• R6 is a linear or non-linear alkylene group having 1 to 3 carbon atoms,
• R7 to R10 are each independently at least one selected from the group consisting of hydrogen, an alkyl group having 1 to 3 carbon atoms, and —CN, and
• B is CH2, O, N-CH3, or
• wherein R′ is a linear or non-linear alkylene group having 1 to 3 carbon atoms,
• provided that when B is CH2, O, or
• at least one of R7 to R10 is —CN,
• wherein, in Formula 2b,
• R11 is a linear or non-linear alkylene group having 1 to 3 carbon atoms, and
• R12 to R15 are each independently at least one selected from the group consisting of hydrogen, an alkyl group having 1 to 3 carbon atoms, and —CN, and at least one of R12 to R15 is —CN,
• wherein, in Formula 2c,
• R16 is a linear or non-linear alkylene group having 1 to 3 carbon atoms, and
• R17 to R19 are each independently at least one selected from the group consisting of hydrogen, an alkyl group having 1 to 3 carbon atoms, and —CN, and
• D is CH, or N.

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

• a lithium salt;
• an organic solvent;
• and
• a non-aqueous electrolyte solution additive comprising at least one compound selected from the group consisting of compounds represented by Formulae 1 and 2:
• wherein, in Formula 1,
• R1 and R2 are each independently a linear or non-linear alkyl group having 1 to 5 carbon atoms, and R3 is a linear or non-linear alkylene group having 1 to 3 carbon atoms, and
• wherein, in Formula 2,
• R4 is a linear or non-linear alkylene group having 1 to 3 carbon atoms,
• A is a substituted or unsubstituted nitrogen-containing heteroaryl group having 3 to 6 carbon atoms, a substituted or unsubstituted nitrogen-containing heteroaryl group having 3 to 6 carbon atoms which includes at least one of oxygen and nitrogen elements, a substituted or unsubstituted nitrogen-containing heterocyclic group having 3 to 6 carbon atoms, or a substituted or unsubstituted nitrogen-containing heterocyclic group having 3 to 6 carbon atoms which includes at least one of oxygen and nitrogen elements,
• R5 is at least one selected from the group consisting of hydrogen, an alkyl group having 1 to 3 carbon atoms, —CN, and
• wherein R is a linear or non-linear alkylene group having 1 to 3 carbon atoms,
• n is an integer of 1 to 6, and
• when n is 2 or more, R5's are the same or different from each other.