The activation energy of the exchange current density was evaluated using an Arrhenius relationship (Equation [6]) across the stoichiometric range of each electrode (Figure ). The activation energies for the positive electrode range between 20 kJ mol -1 to 50 kJ mol -1 and for the negative electrode between 45 kJ mol -1 to 65 kJ mol -1 . The mean values for the Ni-rich and graphite based electrodes were 31.1 kJ mol -1 and 54.8 kJ mol -1 respectively. Ecker et al. reported activation energies of 43.6 kJ mol -1 for Li(Ni0.4Co0.6)O2 and 53.4 kJ mol -1 for graphite. Jow et al. reported activation energies for graphite and NCA as 68 kJ mol -1 and 50 kJ mol -1 respectively. Smart et al. reported activation energies for graphite and Li(Ni0.8Co0.2)O2 with different electrolyte systems in the ranges 45 kJ mol -1 to 60 kJ mol -1 and -34 kJ mol -1 to 48 kJ mol -1 . Similar ranges have been reported for graphite and Li(Ni0.5Mn0.3Co0.2)O2, these were 56 kJ mol -1 to 72 kJ mol -1 and 58 kJ mol -1 to 69 kJ mol -1 . Previously reported values for this cell was 17.8 kJ mol -1 and 35 kJ mol -1 for NMC and graphite respectively. However, these activation energies are appreciably lower than the values reported here and for similar materials. In this case, the parameter table is updated with the newly evaluated activation energies that have been measured at various lithium stoichiometries and corroborate with literature. The dependency of the exchange current density on temperature and lithium concentration can be described as: