TY - JOUR AB - AbstractFluoride ion batteries (FIBs) are a recent alternative all-solid-state battery technology. However, the FIB systems proposed so far suffer from poor cycling performance. In this work, we report La2NiO4.13 with a Ruddlesden-Popper type structure as an intercalation-based active cathode material in all solid-state FIB with excellent cycling performance. The critical charging conditions to maintain the conductivity of the cell were determined, which seems to be a major obstacle towards improving the cycling stability of FIBs. For optimized operating conditions, a cycle life of about 60 cycles and over 220 cycles for critical cut-off capacities of 50 mAh/g and 30 mAh/g, respectively, could be achieved, with average Coulombic efficiencies between 95 – 99%. Cycling of the cell is a result of fluorination/de-fluorination into and from the La2NiO4+d cathode, and it is revealed that La2NiO4.13 is a multivalent electrode material. Our findings suggest that La2NiO4.13 is a promising high energy cathode for FIBs. AU - Nowroozi, Mohammad Ali AU - Wissel, Kerstin AU - Donzelli, Manuel AU - Hosseinpourkahvaz, Niloofar AU - Plana-Ruiz, Sergi AU - Kolb, Ute AU - Schoch, Roland AU - Bauer, Matthias AU - Malik, Ali Muhammad AU - Rohrer, Jochen AU - Ivlev, Sergei AU - Kraus, Florian AU - Clemens, Oliver ID - 41027 IS - 1 JF - Communications Materials KW - Mechanics of Materials KW - General Materials Science SN - 2662-4443 TI - High cycle life all-solid-state fluoride ion battery with La2NiO4+d high voltage cathode VL - 1 ER -