In Figure b, the effect of fluorination on the susceptibility of the cells charged at 50, 110 and 600 mAh g -1 are shown. This electrochemical fluorination of La2Ni0.75Co0.25O4.08 leads to changes in the susceptibility, without the appearance of long-range order (similar as increasing oxygen intercalation from 0.08< δ <0.34). It was found that with increasing charge the maximum shifts towards higher temperatures (highlighted by an arrow). This effect is in principle in agreement with what has been observed for oxygen intercalation, which effectively happens when increasing delta in La2NiO4+δ as we are separating the layers producing more Co also seems to be a strong player for introducing side reactions, though it also leads to more stable cycling closer to the maximum theoretical capacity compared to pure nickelates. Thus, by minimizing the interactions with the carbon matrix independently, mixed cation compounds might indeed help to obtain improved properties for a cathode material.