in the range x 0 6 to x 0 85 in certain embodiments fully fluorinated cf x x 1 0 cf or super fluorinated x gt 1 0 can form at least a portion of carbon carbon composite providing a cfcf x composite a preferred form of li cfcf x cell embodying a fluorinated carbon carbon composite cathode is shown in fig5 wherein the assembled cell is shown with the anode cathode separator and electrolyte enclosed in a coin cell structure the anode and cathode of the assembled cell are separated by a porous separator that is permeated with a non aqueous electrolyte not shown that is in effective contact with both the anode and cathode the following specific examples are given to illustrate certain embodiments the practice of the invention but are not to be considered as limiting in any way fig1 a and 1b shows the differences between the steps involved in making electrodes using carbon carbon composite and powder carbon materials a carbon carbon composite sheet is used as precursor material which is reacted with fluorine to obtain different level of fluorinated carbon carbon composite sheet the cf x cathode can be obtained by stamping out from the composite sheet in comparison carbon powder is used as precursor which is fluorinated and the resulting cf x powder material is then mixed with binder and electrical conductor to make cf x electrodes two samples of fluorinated carbon carbon composite sheets of fluorination level x 0 3 and x 0 76 were used to fabricate li cfcfx 2016 coin cells the form factor of the li cfcf x cells was 2016 coin cell which included a metallic lithium anode fluorinated carbon carbon composite cathode and 1m libf4 electrolyte in a mixture 1 1.