Method of newly producing lithium-ion secondary battery using an electrode plate of a used lithium-ion secondary battery

A method of newly producing a lithium-ion secondary battery by using an electrode plate of a used lithium-ion secondary battery, the method comprising:

• providing the electrode plate of the used lithium-ion secondary battery;
• cleansing the electrode plate having been taken out of the used lithium-ion secondary battery by polar solvent;
• drying the electrode plate thereafter to obtain a cleansed electrode plate;
• forming an electrode body and attaching the cleansed electrode plate to the electrode body;
• providing a battery case;
• securing the electrode body inside the battery case;
• injecting non-aqueous electrolytic solution in a space between the battery case and the cleansed electrode plate inside the battery case, wherein the non-aqueous electrolytic solution comprises lithium salt containing element fluorine and a pH level of which is in a range of 6 to 8 inclusive, wherein
• the method includes non-aqueous electrolytic solution adjusting of bringing the non-aqueous electrolytic solution including lithium salt containing element fluorine into contact with a basic lithium compound to adjust a pH level in a range of 6 to 8 inclusive to form a pH-level-adjusted non-aqueous electrolytic solution;
• and
• injecting the pH-level-adjusted non-aqueous electrolytic solution in the battery case.