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|1. (WO2013161774) LITHIUM SECONDARY BATTERY|
|Title:||LITHIUM SECONDARY BATTERY|
The lithium secondary battery of an embodiment includes a positive electrode including a positive active material and an electrolytic solution including a nonaqueous electrolytic solvent, and is characterized in that the positive active material works at a potential of 4.5 V or higher with respect to lithium and that the electrolytic solution comprises both a nonaqueous electrolytic solvent which comprises a fluorinated phosphoric ester represented by a given formula and a cyclic sulfonic ester represented by a given formula.