Nonetheless, Hansen and coworkers recently proposed that the reaction is limited to the chemical space between Li2FeS2 and Li0.5FeS2 relating to a theoretical capacity of interdependence of both conductivities on the volumetric ratio of the components makes optimizing cathode composite transport a challenging task. The situation is further complicated by the general goal of designing high energy density cathodes that are feasible for application. An increase of the energy density of the cathode, or its areal loading (in units of mAh•cm -2 ), can be achieved by increasing the CAM volume fraction given the simultaneous reduction of formaly electrochemically inactive SE. The increase of the CAM fraction leads to an increase in the effective electronic conductivity of the composite but has detrimental influence on the effective ionic conductivity. This leads to the system being ion transport limited, i.e., to insufficiently fast ion transport, when going to the desired high volume fractions of CAM. Underutilization of the cathode and saturation or decline of the achievable energy density follow. The saturation behavior can be understood considering that increasing the areal loading above a threshold of the CAM volume fraction leads to a significant loss in cathode utilizations and a net-zero win in achievable energy density. This trend is schematically depicted in Figure (red shading). Various examples of ionic transport limitations leading to cathode underutilziation can be found in literature, e.g., for Li6PS5Cl-Graphite anode composites, in Li-S solid-state cells, and in Li6PS5Cl-LiNi0.6Co0.2Mn0.2O2 cathodes. Nonetheless, the energy density of the cathode can be increased above this threshold by increasing the cathode thickness (schematically depicted in Figure , blue shading). But, the increase in cathode thickness can amplify and exacerbate already existing transport limitations at medium to high CAM fraction again limiting the achievable energy densities. This can be intuitively understood by the elongated conduction paths for both charge carriers, that require even faster effective transport through the electrode. In agreement with this viewpoint, Kato and coworkers reported on a decrease of the cathode utilization in LiCoO2-Li10GeP2S12 cathodes when increasing the cathode thickness and simulations on a comparable system using Li3PS4 as SE indicate that reaction fronts and state-of-charge gradients are the underlying reasons. In this work, we investigate the solid-state cathode system Li5.5PS4.5Cl1.5 (SE) -Li2FeS2 (CAM) with varying volume fractions of CAM to identify potential onsets of kinetic limitations. This is done by evaluating the effective conductivities using chronoamperometry, impedance spectroscopy, and effective medium modelling.