descriptor. Again, δ is a function of the effective conductivities, the cathode thickness and the applied current density and introduced as a descriptor for the tendency of the cathode to show nonuniform reaction rate distributions (δ ≫ 1), the buildup of reaction fronts and state-of-charge gradients. It must be considered that this descriptor, without accounting for important microstructural features like CAM-SE contact area, and kinetic parameters such as exchange current densities, can only be evaluated as qualitative, and not quantitative descriptor to predict potential transport limitations in the cathode. Nonetheless, we expect these transport limitations to scale with transportrelated performance properties of the cathode, e.g., the cathode utilization (general contacting of CAM and SE) and rate capability and these trends are reported in literature, where cathode utilization decreases because either σion or σe are insufficiently high or when the cathode thickness and applied current density are increased. The 𝛿-parameters characterizing the investigated Li2FeS2-Li5.5PS4.5Cl1.5 cathodes are