Electrolyte solution for lithium secondary battery and lithium secondary battery comprising the same

1. An electrolyte solution for a lithium secondary battery comprising an electrolyte salt and an organic solvent,

wherein the electrolyte solution further includes a compound represented by Chemical Formula 1 below as an additive:

wherein R is a linear or branched alkylene group with a carbon number of 1 to 3,

R 1 is a linear or branched alkylene group with a carbon number of 1 to 5 or arylene group with a carbon number of 5 to 8, and

when R 1 is a linear or branched alkylene group with a carbon number of 1 to 5, n is an integer of 1 to 10, and when R 1 is an arylene group with a carbon number of 5 to 8, n is an integer of 0 to 10.

2. The electrolyte solution of claim 1 , wherein, in Chemical Formula 1, R is a linear alkylene group with a carbon number of 1 to 3, R 1 is an arylene group with a carbon number of 5 to 8, and n is an integer of 0 to 5.

3. The electrolyte solution of claim 1 , wherein the compound represented by Chemical Formula 1 includes a compound of Chemical Formula 1a below or a compound of Chemical Formula 1b below.

4. The electrolyte solution of claim 1 , wherein the compound represented by Chemical Formula 1 is included in an amount of 0.05 wt % to 7 wt % based on a total weight of the non-aqueous electrolyte solution.

5. The electrolyte solution of claim 4 , wherein the compound represented by Chemical Formula 1 is included in an amount of 0.1 wt % to 5 wt % based on a total weight of the non-aqueous electrolyte solution.

6. The electrolyte solution of claim 1 , wherein the electrolyte salt consists of a combination of (i) at least one positive ion selected from the group consisting of Li + , Na + , and K + and (ii) at least one negative ion selected from the group consisting of PF 6 − , BF 4 − , Cl − , Br − , I − , ClO 4 − , AsF 6 − , B 10 Cl 10 − , CH 3 CO 2 − , CF 3 SO 3 − , CF 3 SO 3 − , SbF 6 − , AlCl 4 − , AlO 4 − , CH 3 SO 3 − , N(CF 3 SO 2 ) 2 − and C(CF 2 SO 2 ) 3 − .

7. The electrolyte solution of claim 6 , wherein the electrolyte salt is any one or a mixture of two or more selected from the group consisting of LiCl, LiBr, LiI, LiClO 4 , LiBF 4 , LiB 10 Cl 10 , LiPF 6 , LiCF 3 SO 3 , LiCH 3 CO 2 , LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , LiAlCl 4 , LiAlO 4 , LiCH 3 SO 3 , chloroborane lithium, lower aliphatic lithium carbonates, and lithium tetraphenylborate.

8. The electrolyte solution of claim 6 , wherein the electrolyte salt further includes one or a mixture of two or more selected from the group consisting of lithium bisperfluoroethanesulfonimide (LiN(C 2 F 5 SO 2 ) 2 , lithium fluoromethanesulfonimide, and lithium (bis)trifluoromethanesulfonimide (LiN(CF 3 SO 2 ) 2 ).

9. The electrolyte solution of claim 1 , wherein the electrolyte salt is included in a concentration of 0.8 M to 1.5 M.

10. The electrolyte solution of claim 1 , wherein the non-aqueous organic solvent includes one solution selected from the group consisting of a cyclic carbonate solvent, a linear carbonate solvent, an ester solvent, and a ketone solvent or a mixed solution of two or more thereof.

11. A lithium secondary battery comprising a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte solution,

wherein the non-aqueous electrolyte solution is the non-aqueous electrolyte solution for a secondary battery described in claim 1 .