| 摘要 |
Disclosed is a nonaqueous electrolyte solution containing a solvent (I) for dissolving an electrolyte salt, and an electrolyte salt (II). The solvent (I) for dissolving an electrolyte salt contains a fluorine-containing solvent (A) selected from the group consisting of fluorine-containing ethers, fluorine-containing esters and fluorine-containing carbonates, a non-fluorine cyclic carbonate (B), and a non-fluorine chain carbonate (C), and further contains not more than 5% by mass of a surface active agent (D) relative to the total of the solvent (I). Consequently, phase separation does not occur in this nonaqueous electrolyte solution even at low temperatures, and the nonaqueous electrolyte solution has excellent incombustibility (flame retardancy), excellent heat resistance, high solubility of the electrolyte salt, improved battery capacity, excellent rate characteristics, and excellent charge/discharge cycle characteristics. |
