| abstract |
The purpose of the present invention is to provide a secondary battery which has a small difference between the voltage during discharging and the voltage during charging, thereby having good energy efficiency, and which has a long charging/discharging life.nIn order to achieve the above-described purpose, a secondary battery of the present invention, which comprises a positive electrode, a negative electrode and an electrolyte solution, is characterized in that: at least one electrode (11), namely the positive electrode and/or the negative electrode contains, as an active material (12), at least one substance that is selected from the group consisting of metal ion-containing fluorides, metal oxides, metal sulfides, metal nitrides and metal phosphides; an electrolyte solution (13) contains an anion receptor; and the electrode active material (12) is able to be dissolved in the electrolyte solution (13) by having the anion receptor form a salt or a complex together with anions contained in the electrode active material (12). |