NON-AQUEOUS ELECTROLYTE AND NON-AQUEOUS ELECTROLYTE SECONDARY CELL

The present invention provide a nonaqueous electrolyte comprising a nonaqueous solvent and an electrolyte which is dissolved in the nonaqueous solvent, wherein the nonaqueous solvent includes ethylene carbonate (EC), propylene carbonate (PC), gamma -butyrolactone (GBL) and a fourth component that is a solvent other than the EC, the PC and the GBL, and the nonaqueous solvent satisfies the following equations (1) to (4): 15