Sodium Rich Vanadium Oxy-Fluorophosphate - Na_3.2 Ni_0.2 V_1.8 (PO₄ )₂ F₂ O - as Advanced Cathode for Sodium Ion Batteries.

ABSTRACT: Conventional sodium-based layered oxide cathodes are extremely air sensitive and possess poor electrochemical performance along with safety concerns when operating at high voltage. The polyanion phosphate, Na₃ V₂ (PO₄ )₃ stands out as an excellent candidate due to its high nominal voltage, ambient air stability, and long cycle life. The caveat is that Na₃ V₂ (PO₄ )₃ can only exhibit reversible capacities in the range of 100 mAh g^-1 , 20% below its theoretical capacity. Here, the synthesis and characterizations are reported for the first time of the sodium-rich vanadium oxyfluorophosphate, Na_3.2 Ni_0.2 V_1.8 (PO₄ )₂ F₂ O, a tailor

SUBMITTER: Essehli R 

PROVIDER: S-EPMC10401166 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature