Non-aqueous electrolyte solution and lithium secondary battery including the same
The present invention relates to a non-aqueous electrolyte solution for a lithium secondary battery, which includes a compound capable of suppressing an electrolyte solution side reaction in a high-temperature and high-voltage environment, and a lithium secondary battery in which cycle characteristics and stability are improved even during high-temperature and high-voltage charging by including the same.
1. A non-aqueous electrolyte solution for a lithium secondary battery, the non-aqueous electrolyte solution comprising:
an ionizable lithium salt;
an organic solvent; and
a compound represented by Formula 1:
wherein, in Formula 1,
R 1 to R 4 are each independently an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, or —(CH 2 ) n —R 5 ,
wherein R 5 is an aryl group having 6 to 18 carbon atoms, or an aryl group having 6 to 18 carbon atoms which is substituted with an alkyl group having 1 to 2 carbon atoms, and
n is an integer of 0 to 2,
wherein the compound represented by Formula 1 is included in an amount of 0.5 wt % to 40 wt % based on a total amount of the non-aqueous electrolyte solution.
2. The non-aqueous electrolyte solution for a lithium secondary battery of claim 1 , wherein, in Formula 1, R 1 is an alkyl group having 1 to 6 carbon atoms, or —(CH 2 ) n —R 5 ,
wherein R 5 is an aryl group having 6 to 18 carbon atoms, or an aryl group having 6 to 18 carbon atoms which is substituted with an alkyl group having 1 to 2 carbon atoms, n is an integer of 0 to 2, and
R 2 to R 4 are each independently an alkyl group having 1 to 6 carbon atoms or an alkenyl group having 2 to 6 carbon atoms.
3. The non-aqueous electrolyte solution for a lithium secondary battery of claim 1 , wherein the compound of Formula 1 comprises at least one compound selected from the group consisting of compounds represented by Formulae 1a to 1f:
4. The non-aqueous electrolyte solution for a lithium secondary battery of claim 3 , wherein the compound of Formula 1 comprises at least one compound selected from the group consisting of the compounds represented by Formulae 1a to 1d and 1f.
5. The non-aqueous electrolyte solution for a lithium secondary battery of claim 1 , wherein the compound represented by Formula 1 is included in an amount of 1 wt % to 30 wt % based on a total amount of the non-aqueous electrolyte solution.
6. A lithium secondary battery comprising a negative electrode, a positive electrode, a separator disposed between the negative electrode and the positive electrode, and a non-aqueous electrolyte solution,
wherein the non-aqueous electrolyte solution is the non-aqueous electrolyte solution for a lithium secondary battery of claim 1 .