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

1 . A lithium secondary battery comprising:

a positive electrode including a positive electrode active material, a negative electrode including a silicon oxide-based negative electrode active material, a separator disposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte solution, wherein the non-aqueous electrolyte solution consists of:

a lithium salt having Li + as a cation, and at least one selected from the group consisting of F − , Cl − , Br − , I − , NO 3 − , N(CN) 2 − , BF 4 − , ClO 4 − , AlO 4 − , AlCl 4 − , PF 6 − , SbF 6 − , ASF 6 − , BF 2 C 2 O 4 − , BC 4 O 8 − , CF 3 SO 3 − , C 4 F 9 SO 3 − , CF 3 CF 2 SO 3 − , (CF 3 SO 2 ) 2 N − , (FSO 2 ) 2 N − , CF 3 CF 2 (CF 3 ) 2 CO − , (CF 3 SO 2 ) 2 CH −1 , CF 3 (CF 2 ) 7 SO 3 − , CF 3 CO 2 − , CH 3 CO 2 − , SCN − , and (CF 3 CF 2 SO 2 ) 2 N − as an anion,

a first organic solvent selected from a cyclic carbonate compound, a linear carbonate compound, an ether compound or an ester compound, wherein the ester compound is selected from the group consisting of methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, butyl propionate, and y-butyrolactone, or a mixture thereof,

fluoroethylene carbonate, and

a compound represented by Formula 1e and at least one compound selected from a compound represented by Formula 2 as a first additive, and

at least one compound selected from the group consisting of compounds represented by the Formulae 3 and 4 as a second additive:

wherein, in Formula 2,

R F 1 and R F 2 are each independently a fluorine-substituted or unsubstituted alkyl group having 1 to 3 carbon atoms, and

R F 3 to R F 6 are each independently a fluorine atom,

wherein, in Formula 4,

R 5 to R 7 are each independently an alkyl group having 1 to 4 carbon atoms, and n is an integer of 1 to 10,

wherein the fluoroethylene carbonate is included in an amount of 0.1 wt % to 40 wt % based on a total weight of the non-aqueous electrolyte solution, and the first additive is included in an amount of 0.1 wt % to 10 wt % based on a total weight of the non-aqueous electrolyte solution.

2 . The lithium secondary battery of claim 1 , wherein the negative electrode active material further comprises a carbon-based negative electrode active material.

3 . The lithium secondary battery of claim 1 , wherein the fluoroethylene carbonate is included in an amount of 0.1 wt % to 30 wt % based on a total weight of the non-aqueous electrolyte solution.

4 . The lithium secondary battery of claim 1 , wherein the fluoroethylene carbonate is included in an amount of 5 wt % to 20 wt % based on a total weight of the non-aqueous electrolyte solution.

5 . The lithium secondary battery of claim 1 , wherein the compound represented by Formula 2 comprises a compound represented by Formula 2b:

6 . The lithium secondary battery of claim 1 , wherein the first additive is included in an amount of 1 wt % to 10 wt % based on a total weight of the non-aqueous electrolyte solution.

7 . A non-aqueous electrolyte solution consisting of:

a lithium salt having Li + as a cation, and at least one selected from the group consisting of F − , Cl − , Br − , I − , NO 3 − , N(CN) 2 − , BF 4 − , ClO 4 − , AlO 4 − , AlCl 4 − , PF 6 − , SbF 6 − , ASF 6 − , BF 2 C 2 O 4 − , BC 4 O 8 − , CF 3 SO 3 − , C 4 F 9 SO 3 − , CF 3 CF 2 SO 3 − , (CF 3 SO 2 ) 2 N − , (FSO 2 ) 2 N − , CF 3 CF 2 (CF 3 ) 2 CO − , (CF 3 SO 2 ) 2 CH −1 , CF 3 (CF 2 ) 7 SO 3 − , CF 3 CO 2 − , CH 3 CO 2 − , SCN − , and (CF 3 CF 2 SO 2 ) 2 N − as an anion,

a first organic solvent selected from a cyclic carbonate compound, a linear carbonate compound, an ether compound or an ester compound, wherein the ester compound is selected from the group consisting of methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, butyl propionate, and γ-butyrolactone, or a mixture thereof,

fluoroethylene carbonate, and

a compound represented by Formula 1e and at least one compound selected from a compound represented by Formula 2 as a first additive, and

at least one compound selected from the group consisting of compounds represented by the following Formulae 3 and 4 as a second additive:

wherein, in Formula 2,

R F 1 and R F 2 are each independently a fluorine-substituted or unsubstituted alkyl group having 1 to 3 carbon atoms, and

R F 3 to R F 6 are each independently a fluorine atom,

wherein, in Formula 4,

R 5 to R 7 are each independently an alkyl group having 1 to 4 carbon atoms, and n is an integer of 1 to 10,

wherein the fluoroethylene carbonate is included in an amount of 0.1 wt % to 40 wt % based on a total weight of the non-aqueous electrolyte solution, and the first additive is included in an amount of 0.1 wt % to 10 wt % based on a total weight of the non-aqueous electrolyte solution.

8 . The non-aqueous electrolyte solution of claim 7 , wherein the fluoroethylene carbonate is included in an amount of 0.1 wt % to 30 wt % based on a total weight of the non-aqueous electrolyte solution.

9 . The non-aqueous electrolyte solution of claim 7 , wherein the fluoroethylene carbonate is included in an amount of 5 wt % to 20 wt % based on a total weight of the non-aqueous electrolyte solution.

10 . The non-aqueous electrolyte solution of claim 7 , wherein the compound represented by Formula 2 comprises a compound represented by Formula 2b:

11 . The non-aqueous electrolyte solution of claim 7 , wherein the first additive is included in an amount of 1 wt % to 10 wt % based on a total weight of the non-aqueous electrolyte solution.