| 摘要 |
The purpose of the present invention is to provide an electrolyte solution, the resistance of which cannot easily increase even after long-term use, and which has a low initial resistance and exhibits high capacity retention properties. The present invention is: an electrolyte solution (i) (excluding an electrolyte solution containing a non-fluorinated sulfolane compound) which contains a mononitrile compound and a spirobipyrrolidinium salt, and in which the content of the spirobipyrrolidinium salt is 0.70 mol/liter or more and less than 1.00 mol/liter; and an electrolyte solution (ii) which contains a mononitrile compound, a non-fluorinated sulfolane compound and a spirobipyrrolidinium salt, and in which the content of spirobipyrrolidinium is 0.70 mol/liter or more and 1.30 mol/liter or less. |
