NON-AQUEOUS LIQUID ELECTROLYTE AND LITHIUM SECONDARY BATTERY COMPRISING THE SAME

摘要

The present invention provides a non-aqueous electrolyte for a lithium secondary battery, which is characterized in comprising lithium salts, an electrolyte solvent, and sodium saccharin compounds or sulfone compounds. The lithium secondary battery including the non-aqueous electrolyte of the present invention suppresses the decomposition reaction of the electrolyte even if the battery is stored at a high temperature in a fully-charged state of 4.2 V, which reduces a swelling phenomenon and improves a high temperature capacity property.