| abstract |
An alkali metal-sulfur secondary that suppresses side reactions during charging and improves coulomb efficiency, suppresses a decrease in discharge capacity due to repeated charge and discharge, has a long battery life, and an improved input / output density. Provide batteries. A positive electrode 2 or a negative electrode having a sulfur-based electrode active material, an ether compound such as THF or glyme, and a fluorine-based solvent represented by F 3 CH 2 C—O—CF 2 CF 2 H, It is an alkali metal-sulfur secondary battery comprising an electrolytic solution in which at least a part of the ether compound and the alkali metal salt forms a complex, and a counter electrode 4. [Selection] Figure 1 |