Thermodynamic and Kinetic Data of Carbon-Fluorine Compounds

Abstract : Samples of the solid fluorocarbons CF(0.597) and CF(0.2369) have been prepared and studied to learn more about their thermodynamic properties. Low temperature heat capacity measurements have been made for both of these samples using a hydrogen cryostat calorimeter. Smoothed thermodynamic functions have been calculated for these compounds over the 20-300K temperature range. Heats of formation have been determined by fluorine bomb calorimetry. This data permits the calculation of a value of E(0) for the electrochemical processes CF(0.2369) (s) + 0.2369 Li (s) to 0.2369 LiF(s) + C (s) and CF(0.597(s) + 0.597 Li (s) to 0.597 LiF(s) + C (s). In order to gather fundamental data to explain the kinetics of the cathode reaction in cells using CFx (where X = 0.6 to 1.1, or higher), surface area measurements were made on the samples CF(1.12), CF(0.597) and CF(1.17).