These findings clearly illustrate the need to conduct electrochemical kinetic measurements across a wide range of current densities, including high current densities, to fully characterize the interfacial charge-transfer kinetics of LIB AMs. The quantitative models developed herein for measuring the apparent α and I0 values are universally generalizable to any electrochemical system, which obeys symmetric BV kinetics, although models must still be developed to treat the case of asymmetry. The experimental methods and electrochemical measurements techniques developed herein are expected to be broadly applicable for measuring the interfacial chargetransfer kinetics of rechargeable battery active materials, although their implementation will surely need to be modified for each specific system. Our measurement results obtained so far of α ≈ 3 for LFP and α ≈ 0.43 for LCO suggest that the mechanisms of interfacial charge-transfer in LIBs cannot be fully explained by the classical theories of electron-transfer. Furthermore, these results