| abstract |
To provide a solvent composition that exhibits non-volatility, non-flammability, thermal stability, chemical stability and high ion conductivity, is excellent in high rate charge/discharge characteristics, is free from the drop of performance at low temperatures and can function as a non-aqueous electrolyte in electrochemical devices. Solvent composition comprising an ionic liquid and a halogenated solvent, which has a halogenation degree of 87% or below and contains at least one partially halogenated alkyl group and/or at least one partially halogenated alkylene group, and in which the solvent composition is under a single phase and in an uniform condition at 25°C. |