NOVELTY - A nonaqueous electrolyte comprises nonaqueous solvent containing ethylene carbonate, propylene carbonate, and fluorinated ester having 3 fluorine atoms as main solvent, and solute dissolved in nonaqueous solvent. All fluorine atoms in the fluorinated ester are bonded to terminal carbon atom which is not located at alpha -position of carbonyl group. The content of ethylene carbonate, propylene carbonate, and fluorinated ester with respect to the total content of ethylene carbonate, propylene carbonate and fluorinated ester is 5-30 wt.%, 20-55 wt.%, and 20-50 wt.%, respectively.    USE - Nonaqueous electrolyte is used for secondary battery (claimed). Uses include but are not limited to power supply of vehicle, electronic device, mobile telephone, personal computer, digital camera, game machine, portable audio instrument, electric vehicle and hybrid vehicle.    ADVANTAGE - The nonaqueous electrolyte secondary battery effectively suppresses the gas-evolution of charging/discharging cycle time.    DETAILED DESCRIPTION - A nonaqueous electrolyte comprises nonaqueous solvent containing ethylene carbonate, propylene carbonate, and fluorinated ester having 3 fluorine atoms as main solvent, and solute dissolved in nonaqueous solvent. All fluorine atoms in the fluorinated ester are bonded to terminal carbon atom which is not located at alpha -position of carbonyl group, and the carbon number excluding the ester group of the fluorinated ester, is 5 or less. The content of ethylene carbonate, propylene carbonate, and fluorinated ester with respect to the total content of ethylene carbonate, propylene carbonate and fluorinated ester is 5-30 wt.%, 20-55 wt.%, and 20-50 wt.%, respectively. An INDEPENDENT CLAIM is included for nonaqueous electrolyte secondary battery, which consists of negative electrode containing negative electrode core material, negative mix layer adhered to negative electrode core material containing binder adhered to graphite particles coated with water-soluble polymer.    DESCRIPTION OF DRAWING(S) - The drawing shows a longitudinal cross sectional view of nonaqueous electrolyte secondary battery.    Battery can (20)    Electrode group (21)    Positive electrode lead (22)    Negative electrode lead (23)    Insulator (24)