METHOD FOR MANUFACTURING SECONDARY BATTERY

To provide a method for manufacturing secondary batteries, with which, when a secondary battery is manufactured using a nonaqueous electrolytic solution containing a sulfonyl imide compound, an improvement effect of a battery performance by dissolving at least one (CO2, etc.) of CO2, CO, HCO3-, and CO32- into the nonaqueous electrolytic solution can be sufficiently obtained and excellent productivity can be also achieved.SOLUTION: A method for manufacturing secondary batteries includes: a charging step in which a nonaqueous electrolytic solution comprising an electrolyte that contains a sulfonyl imide compound represented by a general formula (1) and dissolving CO2, etc. therein is used and, after the nonaqueous electrolytic solution is injected into a secondary battery, the secondary battery is charged before the inside of the secondary battery is evacuated; or a dissolving step in which a nonaqueous electrolytic solution comprising an electrolyte that contains the sulfonyl imide compound is used and, after the nonaqueous electrolytic solution is injected into a secondary battery, CO2, etc. is dissolved into the nonaqueous electrolytic solution, and a charging step in which, after the dissolving step, the secondary battery is charged before the inside of the secondary battery is evacuated. LiN(RSO2)(FSO2) (where R represents a fluorine atom, a 1-6C alkyl group or a 1-6C fluoroalkyl group.) (1)SELECTED DRAWING: None 【課題】スルホニルイミド化合物を含む非水電解液を用いて二次電池を製造するときに、非水電解液中にＣＯ２、ＣＯ、ＨＣＯ３－及びＣＯ３２－の少なくとも一種（ＣＯ２等）を溶存させたことによる電池性能の改善効果が十分に得られ、且つ生産性に優れる二次電池の製造方法を提供する。【解決手段】製造方法は、電解質が一般式（１）で表されるスルホニルイミド化合物を含み且つＣＯ２等を溶存している非水電解液を用い、二次電池に非水電解液を注液した後、二次電池内を脱気する前に充電する充電工程を含む、又は電解質が前記スルホニルイミド化合物を含む非水電解液を用い、二次電池に非水電解液を注液した後、非水電解液中にＣＯ２等を溶存させる溶存工程と、溶存工程後、二次電池内を脱気する前に充電する充電工程とを含む。ＬｉＮ（ＲＳＯ２）（ＦＳＯ２） （Ｒはフッ素原子、炭素数１～６のアルキル基又は炭素数１～６のフルオロアルキル基を示す。） （１）【選択図】なし