ELECTROLYTE FOR LITHIUM SECONDARY BATTERY, AND LITHIUM SECONDARY BATTERY COMPRISING THE SAME

Disclosed is an electrolyte solution for a lithium secondary battery, which is capable of improving the capacity and lifetime of the lithium secondary battery by combining a solvent, a lithium salt, and an additive contained in the electrolyte solution of the lithium secondary battery in an optimal ratio, and a lithium secondary battery comprising the same. The electrolyte solution for the lithium secondary battery comprises a first solvent comprising a heterocyclic compound containing one or more double bonds and at the same time containing any one of an oxygen atom and a sulfur atom; a second solvent comprising at least one of an ether-based compound, an ester-based compound, an amide-based compound, and a carbonate-based compound; lithium salt; zirconium oxynitrate; and lithium nitrate.