ELECTROLYTE FOR LITHIUM SECONDARY BATTERY AND LITHIUM SECONDARY BATTERY COMPRISING SAME

摘要

The present invention relates to an electrolyte for a lithium secondary battery and a lithium secondary battery comprising same, wherein the electrolyte contains lithium salt and an organic solvent, and wherein the electrolyte further comprises a solid salt containing one anion selected from a hexafluorophosphate anion (PF6 -) and a tetrafluoroborate anion (BF4 -) and a phosphonium-based cation. According to the present invention, the lithium secondary battery having improved high-temperature life characteristics can be provided by providing the electrolyte containing the additives.