To describe the heat generation of the cell, the entropic coefficients were measured to capture the reversible heat and the irreversible heat is accounted for in the DFN model definition. The effect of voltage hysteresis is often not considered in models, these properties are therefore evaluated during cell discharge only i.e., positive electrode lithiation and negative electrode delithiation. It has been observed that the hysteresis effect is minimal for parameters including the entropic coefficients and diffusion. The properties are mapped as a function of lithium concentration, the stoichiometric ranges were mapped previously using half-cells. For the positive electrode this corresponds to crystal lattice lithium concentrations of x=0.2567 to 0.9072 and for the negative electrode, x=0.0279 to 0.9014 (Figure ). However, after a battery is discharged to a specific SOC; electrode stoichiometry varies with time as lithium diffuses in/out of the active materials. To correct for this, the open circuit voltages during the test procedure were aligned to the OCV data (Figure ). It should be noted, that the capacity of the negative electrode is oversized to the positive electrode for safety, reducing lithium plating and ensuring enough capacity for the lithium removed from the positive electrode. The positive electrode capacity is not defined by the complete stoichiometric range, but a lithium content which is reversible in the voltage window specified, e.g. LixMO2 where 0.26≤x≤91. In this case NMC811 has a practical upper voltage of 4.4 V. 47