Abstract
The changes in thermodynamic functions, ΔG, ΔS and ΔH were evaluated for (CF)n/Li and (C 2F)n/Li cell reactions. Thermodynamic data were obtained by measuring the cell electromotive forces and temperature coefficients. It was found for CF 0.93 that the observed free energy and enthalpy changes are smaller by ca. 100 kJ mol −1 than those calculated while the entropy change is larger than the calculated value by a factor of more than 10. This difference is understandable from the model that the discharged product is not carbon and lithium fluoride but an intercalation compound having solvated lithium and fluoride ions in its layered lattice. The value of ΔS for the (C 2F)n/Li cell was about half of that for (CF)n.
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