| abstract |
An object of the present invention is to provide a lithium secondary battery having excellent cycle characteristics at high temperatures. A lithium secondary battery comprising a positive electrode containing a positive electrode active material capable of occluding and releasing lithium ions, a negative electrode containing a negative electrode active material capable of occluding and releasing lithium ions, and a non-aqueous electrolyte. The non-aqueous electrolyte is electrolyte (1), general formula (2); (XSO 2 ) (X′SO 2 ) N − Li + (X and X ′ are fluorine atoms, alkyl groups having 1 to 6 carbon atoms) Or a C 1-6 fluoroalkyl group, wherein at least one of X and X ′ is a fluorine atom.) And a solvent, A lithium secondary battery, wherein an abundance ratio of S atoms in a range of 10 nm or less on a surface of a positive electrode or a negative electrode is 100% when an abundance ratio of all atoms by XPS measurement is 100%. [Selection figure] None |