Numerous studies have shown that the interfacial resistance of layered oxide cathodes is strongly correlated to the thickness and composition of the SEI . Based on the literature, a reaction step with α = 0.5 for LCO could, therefore, also be plausibly attributed to Li + conduction through the SEI. Unfortunately, much more detailed studies would be required, including measurements on a wide range of LIB AMs, to make any more definitive conclusions about the mechanisms of interfacial charge-transfer in LIBs.