Sodium Rich Vanadium Oxy‐Fluorophosphate – Na<sub>3.2</sub>Ni<sub>0.2</sub>V<sub>1.8</sub>(PO<sub>4</sub>)<sub>2</sub>F<sub>2</sub>O – as Advanced Cathode for Sodium Ion Batteries

  1. Essehli, Rachid 1
  2. Yahia, Hamdi Ben 2
  3. Amin, Ruhul 1
  4. Li, Mengya 1
  5. Morales, Daniel 4
  6. Greenbaum, Steven G. 3
  7. Abouimrane, Ali 1
  8. Parejiya, Anand 1
  9. Mahmoud, Abdelfattah 13456
  10. Boulahya, Khalid 5
  11. Dixit, Marm 1
  12. Belharouak, Ilias 1
  1. 1 Electrification and Energy Infrastructures Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA
  2. 2 Qatar Environment and Energy Research Institute Hamad Bin Khalifa University Qatar Foundation Doha 34110 Qatar
  3. 3 Department of Physics &amp; Astronomy Hunter College of the City University of New York New York NY 10065 USA
  4. 4 Exponent, Inc. Natick MA 01760 USA
  5. 5 Departamento de Química Inorgánica Facultad de Químicas Universidad Complutense Madrid 28040 Spain
  6. 6 Greenmat Cesam Research Unit University of Liège Department of Chemistry Liège 4000 Belgium
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Revista:
Advanced Science

ISSN: 2198-3844,  2198-3844

Año de publicación: 2023

Tipo: Artículo

DOI: 10.1002/ADVS.202301091 GOOGLE SCHOLAR lock_openAcceso abierto editor

Otras publicaciones en: Advanced Science

Resumen

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, Na3.2Ni0.2V1.8(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 Na3.2Ni0.2V1.8(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.

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