Nonaqueous electrolytes and nonaqueous-electrolyte secondary battery employing the same

The present invention provides a nonaqueous electrolyte mainly comprising a nonaqueous solvent and an electrolyte dissolved therein, wherein the nonaqueous electrolyte comprises at least one compound selected from the group consisting of saturated chain hydrocarbons, saturated cyclic hydrocarbons, aromatic compounds having a halogen atom, and ethers having a fluorine atom, and further comprises a monofluorophosphate and/or a difluorophosphate.