NON-AQUEOUS ELECTROLYTE SOLUTION FOR LITHIUM SECONDARY BATTERY, AND LITHIUM SECONDARY BATTERY COMPRISING SAME

Provided is a non-aqueous electrolyte solution for a lithium secondary battery containing a lithium salt, an organic solvent and a phosphoric acid-based additive of specific structure. By adding the phosphoric acid-based additive according to an embodiment of the present invention to the electrolyte solution, the lithium secondary battery can significantly improve the high temperature stability.