LITHIUM SECONDARY BATTERY USING IONIC LIQUID

摘要

Provided is a flame-retardant lithium secondary battery, which exerts excellent battery performance and which has high safety compared to conventional batteries. Specifically, provided is a lithium secondary battery which uses a non-aqueous electrolyte solution using, as the solvent, an ionic liquid containing: bis(fluorosulfonyl)imide anion as the anionic component; and a positive electrode containing a positive electrode active material represented by general formula (1). The general formula (1) is LiNixMnyO4, wherein, in the formula (1), x and y represent a number that satisfies the following relationships: x+y=2, and x:y=27.5:72.5 to 22.5:77.5.