2026-08-22T19:39:35Zhttps://docta.ucm.es/rest/oai/request
oai:docta.ucm.es:20.500.14352/1243342025-09-26T23:46:59Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Boulahya, Khalid author Rachid Essehli author Ben Yahia, Hamdi author Amin, Ruhul author Li, Mengya author Morales, Daniel author G. Greenbaum, Steven author Abouimrane, Ali author Parejiya, Anand author Mahmoud, Abdelfattah author Dixit, Mahmoud author Belharouak, Mahmoud 2025-09-26T08:04:48Z 2025-09-26T08:04:48Z 2023-05-13 Essehli, Rachid, et al. «Sodium Rich Vanadium Oxy‐Fluorophosphate – Na3.2 Ni0.2 V1.8 (PO4 )2 F2 O – as Advanced Cathode for Sodium Ion Batteries». Advanced Science, vol. 10, n.o 22, agosto de 2023, p. 2301091. DOI.org (Crossref), https://doi.org/10.1002/advs.202301091. 10.1002/advs.202301091 https://hdl.handle.net/20.500.14352/124334 https://doi.org/10.1002/advs.202301091 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, Na3V2(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 Na3V2(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 3.2Ni0.2V1.8(PO4)2F2O, a tailored derivative compound of Na3V2(PO4)3, with extensive electrochemical and structural analyses. Na3.2Ni0.2V1.8(PO4)2F2O delivers an initial reversible capacity of 117 mAh g−1 between 2.5 and 4.5 V under the 1C rate at room temperature, with 85% capacity retention after 900 cycles. The cycling stability is further improved when the material is cycled at 50 °C within 2.8–4.3 V for 100 cycles. When paired with a presodiated hard carbon, Na3.2Ni0.2V1.8(PO4)2F2O cycled with a capacity retention of 85% after 500 cycles. Cosubstitution of the transition metal and fluorine in Na 3.2Ni0.2V1.8(PO4)2F2O as well as the sodium-rich structure are the major factors behind the improvement of specific capacity and cycling stability, which paves the way for this cathode in sodium-ion batteries. eng Sodium Rich Vanadium Oxy-Fluorophosphate – Na 3.2Ni0.2V1.8(PO4)2F2O – as Advanced Cathode for Sodium Ion Batteries journal article 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URL https://docta.ucm.es/bitstreams/36f51505-ae29-4c01-8857-b58983533d24/download File MD5 793b868c2b47228e5a910ea3f505828b 6694385 application/pdf Advanced Science - 2023 - Essehli - Sodium Rich Vanadium Oxy‐Fluorophosphate Na3 2Ni0 2V1 8 PO4 2F2O as Advanced (2).pdf