| abstract |
Even when electrochemical devices, such as a lithium ion secondary battery, are preserve | saved at high temperature, compared with before storage, the electrolyte solution which hardly raises the resistance of the said electrochemical device is provided. Phosphite tris (trimethylsilyl), and at least one fluorinated saturated cyclic carbonate (1) selected from the group consisting of pentafluoropropylethylene carbonate and heptafluoroisobutylethylene carbonate It is an electrolyte solution made into. |