LITHIUM-ION SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a lithium-ion secondary battery capable of securing cycle characteristics and preservation properties.

SOLUTION: The lithium-ion secondary battery is provided with a positive electrode 21 and a negative electrode 22 as well as electrolyte solution which is impregnated into a separator 23 fitted between the positive electrode 21 and the negative electrode 22. The electrolyte solution contains a sulfone compound with a predetermined structure (sulfonic acid-carboxylic anhydride without having an aromatic ring) as well as a solvent and electrolyte salt. Compared with the case without containing the sulfone compound, decomposition reaction of electrolyte solution is restrained.

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