Two types of sulfur exist in the starting state, dissolved S8 -in the electrolyte, to the solubility limit (19 mol m -3 ), as presented in Kumasaren's model , and the remaining sulfur (from the amount calculated in the X-ray CT) which is in the electrolyte phase, but not yet dissolved. On progression of the discharge model, dissolved S8 -gets consumed via the electrochemical reactions, allowing more of the initial reservoir of non-dissolved sulfur to dissolve. The distribution of both types of sulfur in the electrolyte phase is homogenous at the initiation of the model; 2. The CBD phase is treated as solid and porosity of the CBD, electrolyte content and ion transport properties through the CBD are not considered; 3. The porosity change as the model discharges (with corresponding changes in volume fraction of sulfur, electrolyte and solid polysulfides) is resolved via Tertiary current distribution, Nernst-Planck theory; 4. The specific surface area which is the active reaction site varies according to the porosity and species concentration change (accounting for deposition of solid polysulphides, but not accounting for the morphology of these deposits); 5. The precipitation and dissolution rate of corresponding species are adjusted to the current concentration; 6. The amount of electrolyte in the modelled domain is limited to the volume fraction of pore+sulfur from the CT, no electrolyte reservoir is assumed in the separator, CBD or wider cell architecture. The separator porosity is taken into account (0.5) in the model, giving an effective diffusion rate of Li + ions across it which is constant throughout the discharge process.