1. ‘diffusion-limited C-rate’ (DLC) introduced by Heubner et al. [A. Nickol, T. Schied, C. Heubner, M. Schneider, A. Michaelis, M. Bobeth and G. Cuniberti, J. Electrochem. Soc., 167(9), 90546 (2020).]. The DLC of a porous Li-insertion electrode determines the intrinsic rate performance limit caused by Li-depletion in the electrolyte. For C-rates higher that the DLC, the attainable capacity is reduced significantly.