| abstract |
A non-aqueous mixed solvent for use in a non-aqueous electrolytic solution for electrochemical energy devices which can enhance the high current charging and discharging capacity and low-temperature charging and discharging capacity of an electrochemical energy device, and prevent the device from damage at high temperatures. The solvent comprises an aprotic solvent and at least one fluorinated ether having a boiling point of 80° C. or more and being represented by R 1 —O—R f1 (formula 1), R 2 —O—(R f2 —O) n —R 3 (formula 2) or R fh1 —O-A-O—R fh2 (formula 3). Also electrolytic solutions comprising such solvents and electrochemical energy devices containing such electrolytic solutions. |