METHOD OF MANUFACTURING LITHIUM ION SECONDARY BATTERY

摘要

The present invention relates to a producing method of a lithium ion secondary battery comprising: a battery case which accommodates a positive electrode; a negative electrode; and a non-aqueous electrolytic solution containing LiBOB, and containing Na inside a battery system. The producing method comprises: a pressure reduction process of reducing an internal pressure of the battery case; and a liquid injection step of injecting the non-aqueous electrolytic solution after the pressure reduction process.