The diffusion coefficients of NMC materials have been reported in the range of 10 -10 cm 2 s -1 to 10 -8 cm 2 s -1 previously, corroborating fairy well with the results here. However, the diffusion values for SiOy and graphite have had values reported much higher than observed here, between 10 -11 cm 2 s -1 to 10 -8 cm 2 s -1 and 10 -10 cm 2 s -1 to 10 -8 cm 2 s -1 for the materials respectively. Diffusion coefficients are often reported over several orders of magnitude due to differences in experimental set-ups and analysis. The solid-phase diffusivity often has to be tuned to a higher value for to provide reasonable simulation values as if the low diffusivity values are included in the fits, the simulations either do not converge or provide unrealistic results. This tuning was carried out here and the fitted profiles are illustrated in Figure .