| abstract |
A hetero element-containing organic solvent containing a chain carbonate represented by the following general formula (1): For a metal salt having an alkali metal, alkaline earth metal or aluminum as a cation and having a chemical structure represented by the following general formula (2) as an anion, An electrolyte solution characterized by being contained in a molar ratio of 1.5 or less. R 10 OCOOR 11 general formula (1) (R 21 X 21 ) (R 22 SO 2 ) N General formula (2) |