ELECTROCHEMICAL DEVICE AND NONAQUEOUS ELECTROLYTE SOLUTION FOR ELECTROCHEMICAL DEVICE

摘要

The present invention addresses the problem of providing an electrochemical device having superior storage characteristics at high temperatures and superior high voltage cycle characteristics and a nonaqueous electrolyte solution used therein. The present invention is an electrochemical device provided with a positive electrode, negative electrode, and a nonaqueous electrolyte solution that contains a nonaqueous solvent and an electrolyte salt. This electrochemical device is characterized by the nonaqueous solvent containing a fluorine-containing chain carbonate shown by RfOCOOR (wherein Rf is a C1-4 fluorine-containing alkyl group and R is a C1-4 alkyl group) and containing compounds shown by RfOH, ROH, and ROCOCl at a total of 5000 ppm to the fluorine-containing chain carbonate.