NOVELTY - An electrolyte (A1) comprises an electrolyte salt (having a concentration of at least 0.5 M) selected from: i) a fluoroalkyl-substituted lithium hexafluorophosphate salt; ii) a fluoroalkyl-substituted lithium tetrafluoroborate salt; iii) a fluoroalkyl-substituted lithium oxolate borate salt; a fluorinated solvent (30-80 wt.% excluding a weight of the electrolyte salt); and a non-fluorinated solvent selected from an ester, an ether, and a carbonate, where the electrolyte is a one-phase solution at a temperature of -30 degrees C to 80 degrees C.    USE - As electrolyte for electrochemical cell (claimed); for vehicle applications, aerospace applications, grid applications.    ADVANTAGE - The fluorinated solvents are good alternatives to carbonate based solvents. The fluorinated solvents tend to be less flammable than their non-fluorinated counterparts. In addition to their lower flammability, the fluorinated solvents tend to be less toxic, have lower viscosity, and tend to be more stable when contacting lithium and when exposed to operating potentials of battery electrodes. The electrolyte can be formulated in such a way that it stays as a one-phase solution (also known as a single phase solution, a homogeneous solution, or simply a solution) at a temperature of -30 degrees C to 80 degrees C. The electrolyte does not separate into multiple phases, each having a different composition, within the above specified temperature. The one-phase solution retains its solution properties over the specified temperature range. As such, different components of the electrolyte are miscible within the specified temperature range. The electrolyte salts are not only solvable within the solvents at this temperature range but also help to maintain all components within the single phase rather than allowing the components to separate. The electrolytes have a conductivity of 0.1-10 mS/cm. As such, non-flammable electrolytes containing fluorinated solvents not only have improved safety characteristics but are also capable of maintaining required charge and discharge rates. The electrochemical cells build with non-flammable electrolytes exhibit stable cycling performance. The fluorinated solvents can also help with forming more stable solid electrolyte interphase (SEI) layers on electrode surfaces particularly when used with active materials that exhibit high operating potentials or may be susceptible to mechanical stresses (e.g. increase and decrease in volume during cycling exhibited by silicon, tin, and germanium).    DETAILED DESCRIPTION - An electrolyte (A1) comprises an electrolyte salt (having a concentration of at least 0.5 M) selected from: i) a fluoroalkyl-substituted lithium hexafluorophosphate salt having formula LiPFxR(1-x); ii) a fluoroalkyl-substituted lithium tetrafluoroborate salt having formula LiBFx1R(1-x1); iii) a fluoroalkyl-substituted lithium oxolate borate salt having formula LiBC2O4R2; iv) a salt having formula (I), (II) and (III); and a fluorinated solvent (30-80 wt.% excluding a weight of the electrolyte salt), where the fluorinated solvent has the formula Cx2FyHzOi; and a non-fluorinated solvent selected from an ester, an ether, and a carbonate, where the electrolyte is a one-phase solution at a temperature of -30 degrees C to 80 degrees C.    x=1-5;    R=1-8C fluorinated alkyl; or a combination of fluorinated alkyl having a chain length of 1-8 and a sulfonyl group;    x1=1-4;    x2=3-15;    y=1-30;    z=0-15;    i=1-5.    An INDEPENDENT CLAIM is included for an electrochemical cell comprising a positive electrode (106); a negative electrode (104); and the electrolyte (A1) providing ionic exchange between the positive electrode and negative electrode.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic cross-sectional view of the electrochemical cell.    Cylindrical wound cell (100)    Cylindrical case (102)    Negative electrode (104)    Positive electrode (106)    Separator (108)    Weld plate (112)    Rupture membrane (114)    Header cup (118)    Insulating gasket (119)