For fractions of ΦCAM > 0.74, δ increases significantly as a consequence of reaching the percolation threshold of σion. With that, for pure Li2FeS2, a value of 300 is obtained indicating the onset of strong transport limitations (δ ≫ 1). Following, cathodes relating to these δ-parameters are investigated in terms of electrochemical performance and the potential of δ as a qualitative descriptor is evaluated.