NOVELTY - A nonaqueous electrolyte comprises a nonaqueous solvent and an alkali metal salt. The nonaqueous solvent includes carbonate-type solvent, fluorine-containing phosphate ester (I) and fluorine-containing ether (II). The flash point of the nonaqueous electrolyte is not measured at 80 degrees C or less by flash point measuring method using closed-cup flashing point tester, measured based on JIS K2265-2. The nonaqueous electrolyte boils off before ignition with the flash point measuring method by Cleveland open-type flash point tester, based on JIS K2265-4..    USE - Nonaqueous electrolyte is used for nonaqueous electrolyte battery (claimed) e.g. lithium ion secondary battery for household electronic appliances, electric vehicles and electrical power storages.    ADVANTAGE - The nonaqueous electrolyte is nonflammable and provides nonaqueous electrolyte battery with excellent low-temperature battery characteristics.    DETAILED DESCRIPTION - A nonaqueous electrolyte comprises a nonaqueous solvent and an alkali metal salt. The nonaqueous solvent includes carbonate-type solvent, fluorine-containing phosphate ester of formula: R1O-P(=O)(-OR2)-OR3 (I) and fluorine-containing ether of formula: R4-O-R5 (II). The flash point of the nonaqueous electrolyte is not measured at temperature which is 80 degrees C or less by flash point measuring method using closed-cup flashing point tester, measured based on JIS K2265-2. The nonaqueous electrolyte boils off before ignition with the flash point measuring method by Cleveland open-type flash point tester, based on JIS K2265-4.    R1-R3=linear or branched 1-6C alkyl or linear or branched 1-6C fluoroalkyl, in which at least one of R1-R3 is fluoroalkyl;and    R4,R5=linear or branched 1-6C alkyl or linear or branched 1-6C fluoroalkyl, in which at least one of R4 and R5 is fluoroalkyl.    An INDEPENDENT CLAIM is included for nonaqueous electrolyte battery, which consists of a positive electrode, a negative electrode, and the nonaqueous electrolyte.