NOVELTY - Manufacture of nonaqueous electrolyte secondary battery involves preparing (S10) negative electrode, and positive electrode, producing (S30) an electrode material using the positive electrode and negative electrode, forming assembly (S40) using the electrode material, accommodating the assembly in a battery case, injecting (S50) non-aqueous electrolyte to which lithium bis(oxalate) borate is added into the battery case, and discharging (S60) predetermined discharge voltage after charging (S60) predetermined charge voltage with respect to the assembly.    USE - Manufacture of nonaqueous electrolyte secondary battery. Uses include but are not limited to hybrid vehicle, electric motor vehicle, fuel motor vehicle, personal computer and portable terminal.    ADVANTAGE - The method enables manufacture of nonaqueous electrolyte secondary battery with excellent capacity maintenance factor, and suppressed precipitation of substance derived from electric charge support.    DETAILED DESCRIPTION - Manufacture of nonaqueous electrolyte secondary battery involves preparing negative electrode containing negative electrode active material, and sodium component as an unavoidable impurities, and positive electrode containing positive electrode active material, producing an electrode material using the positive electrode and negative electrode, forming assembly using the electrode material, accommodating the assembly in a battery case, injecting nonaqueous electrolyte to which lithium bis(oxalate) borate is added into the battery case, and discharging predetermined discharge voltage after charging predetermined charge voltage with respect to the assembly. The molar ratio of dissolved sodium ion dissolved and lithium bis(oxalate) borate in the nonaqueous electrolyte is less than 0.8.    DESCRIPTION OF DRAWING(S) - The drawing shows a flowchart explaining manufacture of nonaqueous electrolyte secondary battery. (Drawing includes non-English language text)    Preparation of positive electrode and negative electrode (S10)    Removal of sodium component (S20)    Production of electrode material (S30)    Formation of assembly (S40)    Injection of nonaqueous electrolyte (S50)    Charge and discharge process (S60)