Abstract
The example that was discussed earlier, the reaction of lithium with iodine to form LiI, dealt with elements and thermodynamically stable phases. By knowing a simple parameter, the standard Gibbs free energy of formation of the reaction product, the cell voltage under equilibrium and near-equilibrium conditions can be calculated for this reaction. If the cell operates under a fixed pressure of iodine at the positive electrode and at a stable temperature, the Gibbs phase rule indicates that the number of the residual degrees of freedom F in both the negative and positive electrodes is zero. Thus, the voltage is independent of the extent of the cell reaction.
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Huggins, R.A. (2010). Electrode Reactions that Deviate from Complete Equilibrium. In: Energy Storage. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-1024-0_14
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DOI: https://doi.org/10.1007/978-1-4419-1024-0_14
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