~15.25 Å . A similar observation is present for La2NiO4 in a FATO-based composite, as only ~60 % of the active material were fully fluorinated. Even though, the remaining La2NiO4 in the space group I4/mmm shows an expansion of the c-axis (c = 12.73 Å) as compared to the pristine material (c = 12.68 Å) which is indicative of an oxidative fluorination as also reported by Nowroozi et al. . Therefore, even though not all the La2NiO4 present in the composite could be fully fluorinated, all powder particles participate in the electrochemical reaction also for this composite. The cyclic performance of both active materials was significantly improved by using FATO-NPs instead of Super P. While both Super P-based cells failed before reaching 10 cycles, the FATO-NP based cells cycled with much better stability, still supplying significant discharge capacities of ~20 mAh g -1 after 50 or 60 cycles for La2CoO4 and La2NiO4 respectively.