The non-aqueous electrolytic solution according to the first aspect of the present invention and the non-aqueous electrolytic solution according to the second aspect of the present invention can each be obtained, for example, by mixing the above-described non-aqueous solvents, and by dissolving the above-described lithium salt in the resulting mixed non-aqueous solvent, and by adding other additives in the resulting non-aqueous electrolytic solution.
In this case, it is preferable that the non-aqueous solvent to be used and the additives to be added to the non-aqueous electrolytic solution are preliminarily purified to the extent that the productivity does not decrease, and the non-aqueous solvents and the additives extremely small in the amounts of impurities are used.
The non-aqueous electrolytic solution according to the first aspect of the present invention and the non-aqueous electrolytic solution according to the second aspect of the present invention can be used in the following lithium secondary battery or the following lithium ion capacitor, and can use as the non-aqueous electrolyte not only liquid non-aqueous electrolytes but also gelled non-aqueous electrolytes. Moreover, the non-aqueous electrolytic solution according to the first aspect of the present invention and the non-aqueous electrolytic solution according to the second aspect of the present invention can also be used for solid polymer electrolytes. In particular, these non-aqueous electrolytic solutions are more preferably used for lithium secondary batteries.