Using a three-electrode configuration for the experiment allows us to measure the entropic terms for SoCs between 0% and 100%, see Figure . This means that the entropic term for both electrodes is mapped at the same SOCs for both electrodes. At low states of lithiation the graphite OCV decreases as temperature increases, this corresponds to a ∆𝐹𝐹 < 0. As the graphite electrode is delithiated the entropic term becomes positive. This change occurs at x = 0.6. These observations agree with research by Reynier et al. on a pure graphite electrode. This suggests that less than 10wt% of SiOy has a minimal effect on the entropic term. This results are also consistent with the entropic term of a silicon-graphite material that was reported for lithium stoichiometries less than 0.7. The entropic term of the NMC electrode is negligible at several states of lithiation. For the other states of lithiation it does not show an appreciable value. This means the full cell behaviour is dominated by the negative electrode and the trend is the same, although the opposite magnitude. This is due to the definition of the full cell potential (Ecell = Ewe-Ece). The reversible heat generation in the cell is determined by the graphite-based electrode. These values are in good agreement with published results; the entropic term of NMC-type electrodes have been shown to be negligible in comparison to other positive electrode chemistries. The variation of entropic term with stoichiometry has been captured by fitting functions to the experimental data. For the negative and positive electrode these functions are (fitting parameters outlined in Table ):