NOVELTY - The lithium ion fluoride battery comprises a positive electrode comprising a carbon nanofiber or carbon nanotube material, a negative electrode comprising a graphite material, an electrolyte placed between the positive and negative electrodes, and a secondary electrochemical cell. The electrolyte conducts charge carriers between the positive and negative electrodes, and comprises a solvent and a fluoride salt such as lithium hexafluorophosphate (LiPF6), which is partially present in a dissolved state in the electrolyte to generate fluoride ions in the electrolyte.    USE - The lithium ion fluoride battery is useful as power sources in electric vehicles, air and space craft technologies, biomedical instrumentation and portable electronic devices such as cellular telephones and portable computers.    ADVANTAGE - The light weight and high performance lithium ion fluoride battery has excellent charge-discharge characteristics, high energy and power density and improved reliability and stability.    DETAILED DESCRIPTION - The lithium ion fluoride battery comprises a positive electrode comprising a carbon nanofiber or carbon nanotube material, a negative electrode comprising a graphite material, an electrolyte placed between the positive and negative electrodes, and a secondary electrochemical cell. The electrolyte conducts charge carriers between the positive and negative electrodes, and comprises a solvent and a fluoride salt such as lithium hexafluorophosphate (LiPF6), which is partially present in a dissolved state in the electrolyte to generate fluoride ions in the electrolyte. The positive and negative electrodes reversibly exchange the fluoride ions with the electrolyte during charging or discharging of the battery. The positive electrode comprises a multiwalled carbon nanofiber material, an irradiated material and a polyvinylidene fluoride component, and is provided in a defluorinated state. A ratio of the masses of the carbon nanofiber or carbon nanotube material to the polyvinylidene fluoride component is 2-4. The positive electrode is electrochemically precycled with fluoride ions prior to use in the battery, where the fluoride ions are electrochemically inserted into and removed from the positive electrode during precycling. The negative electrode is a graphite electrode, and is electrochemically precycled with lithium ions prior to use in the battery, where the lithium ions are electrochemically inserted into and removed from the negative electrode during precycling. The negative electrode is provided in a delithiated state, and comprises conductive carbon component. The electrolyte is 1M LiPF6 in ethylene carbonate/dimethyl carbonate (+0.1 M potassium fluoride (KF)). During discharge of the battery, the fluoride ions are released from the positive electrode and accommodated by the negative electrode, and during charging of the battery, the fluoride ions are released from the negative electrode and accommodated by the positive electrode. An INDEPENDENT CLAIM is included for a method for generating an electrical current.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a lithium ion fluoride full cell.