Previous investigations studied single transition metal-ion-containing RP compounds as cathodes. Amongst these La2CoO4 18 , La2NiO4 , LaSrMnO4 , and Sr2MnO3F2 were studied intensively. La2NiO4.13 could be cycled for over 220 cycles with the coulombic efficiency between (95-99%) by limiting the critical cut-off capacity to 30 mAh g -1 compared to 60 cycles if the critical cut-off capacity was set to 50 mAh g -1 to limit detrimental side reactions of the carbon-based additive .