Electrolytic solution and battery

1. An electrolytic solution for a secondary battery, the electrolytic solution comprising:

an electrolyte salt; and

a solvent including a first solvent and a second solvent;

wherein the first solvent includes 4-fluoro-1,3-dioxolane-2-one; and

wherein the second solvent includes Chemical Formula No. 23 represented below:

wherein an amount of Chemical Formula No. 23 in the solvent ranges from 0.1 wt % to 1 wt %.

2. The electrolytic solution according to claim 1 , wherein the solvent further includes at least one of ethylene carbonate or dimethyl carbonate.

3. The electrolytic solution according to claim 2 , wherein the solvent further includes a cyclic carbonate including an unsaturated bond.

4. The electrolytic solution according to claim 3 , wherein the cyclic carbonate includes at least one of a vinylene carbonate-based compound, vinylene carbonate, a vinyl ethylene carbonate-based compound, vinyl ethylene carbonate, or a methylene ethylene carbonate-based compound.

5. The electrolytic solution according to claim 4 , wherein the solvent further includes at least one of a sultone, propene sultone, an acid anhydride, succinic anhydride, or sulfobenzoic anhydride.

6. The electrolytic solution according to claim 5 , wherein at least one of the sultone, propene sultone, the acid anhydride, succinic anhydride, or sulfobenzoic anhydride is in an amount from 0.5 wt % to 3 wt %.

7. The electrolytic solution according to claim 3 , wherein the cyclic carbonate is in an amount from 0.01 wt % to 5 wt %.

8. The electrolytic solution according to claim 1 , wherein the electrolyte salt includes lithium hexafluorophosphate.

9. The electrolytic solution according to claim 1 , wherein the electrolytic solution is for a lithium ion secondary battery.

10. An electrolytic solution for a secondary battery, the electrolytic solution comprising:

an electrolyte salt; and

a solvent including a first solvent and a second solvent, and the solvent does not include a trialkyl phosphate,

wherein the first solvent includes 4-fluoro-1,3-dioxolane-2-one,

the second solvent includes Chemical Formula No. 23 represented below:

and

an amount of Chemical Formula No. 23 in the solvent ranges from 0.1 wt % to 1 wt %.

11. The electrolytic solution according to claim 10 , wherein the solvent further includes at least one of ethylene carbonate or dimethyl carbonate.

12. The electrolytic solution according to claim 11 , wherein the solvent further includes a cyclic carbonate including an unsaturated bond.

13. The electrolytic solution according to claim 12 , wherein the cyclic carbonate includes at least one of a vinylene carbonate-based compound, vinylene carbonate, a vinyl ethylene carbonate-based compound, vinyl ethylene carbonate, or a methylene ethylene carbonate-based compound.

14. The electrolytic solution according to claim 13 , wherein the solvent further includes at least one of a sultone, propene sultone, an acid anhydride, succinic anhydride, or sulfobenzoic anhydride.

15. The electrolytic solution according to claim 14 , wherein at least one of the sultone, propene sultone, the acid anhydride, succinic anhydride, or sulfobenzoic anhydride is in an amount from 0.5 wt % to 3 wt %.

16. The electrolytic solution according to claim 12 , wherein the cyclic carbonate is in an amount from 0.01 wt % to 5 wt %.

17. The electrolytic solution according to claim 10 , wherein the electrolyte salt includes lithium hexafluorophosphate.

18. An electrolytic solution for a secondary battery, the electrolytic solution comprising:

at least a solvent including a first solvent and a second solvent,

wherein the second solvent includes Chemical Formula No. 23 represented below:

and

wherein an amount of Chemical Formula No. 23 in the solvent ranges from 0.1 wt % to 1 wt %.