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33. Sodium Rich Vanadium Oxy‐Fluorophosphate – Na3.2Ni0.2V1.8(PO4)2F2O – as Advanced Cathode for Sodium Ion Batteries

Author

Essehli, Rachid, primary, Yahia, Hamdi Ben, additional, Amin, Ruhul, additional, Li, Mengya, additional, Morales, Daniel, additional, Greenbaum, Steven G., additional, Abouimrane, Ali, additional, Parejiya, Anand, additional, Mahmoud, Abdelfattah, additional, Boulahya, Khalid, additional, Dixit, Marm, additional, and Belharouak, Ilias, additional

Published
2023
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48. Sodium Rich Vanadium Oxy‐Fluorophosphate – Na3.2Ni0.2V1.8(PO4)2F2O – as Advanced Cathode for Sodium Ion Batteries.

Author

Essehli, Rachid, Yahia, Hamdi Ben, Amin, Ruhul, Li, Mengya, Morales, Daniel, Greenbaum, Steven G., Abouimrane, Ali, Parejiya, Anand, Mahmoud, Abdelfattah, Boulahya, Khalid, Dixit, Marm, and Belharouak, Ilias

Subjects
*SODIUM ions, *TRANSITION metal oxides, *CATHODES, *VANADIUM, *TRANSITION metals, *HIGH voltages, *ELECTROCHEMICAL analysis
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, 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. [ABSTRACT FROM AUTHOR]

Published
2023
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49. Na3Zr2Si2PO12 Solid Electrolyte Membrane for High‐Performance Seawater Battery.

Author

Li, Mengya, Dixit, Marm, Essehli, Rachid, Jafta, Charl J., Amin, Ruhul, Balasubramanian, Mahalingam, and Belharouak, Ilias

Subjects
SOLID electrolytes, SEAWATER, ENERGY storage, IONIC conductivity, SURFACE chemistry, SALINE water conversion
Abstract

Seawater batteries (SWBs) have gained tremendous interest in the electrochemical energy storage research field because of their low cost, natural abundance, and potential use for long‐duration energy storage. Advancing a SWB to demonstration projects is plagued by the poor electrochemical performance stemming from the poor interfaces of the solid electrolyte (SE), as well as the structural and chemical instabilities and sluggish ionic transport properties. In this study, the anode compartment of a surrogate SWB is constructed with a Na | SE | hard carbon configuration, and tailored dopants are introduced into the Nasicon‐type Na3Zr2Si2PO12(NZSP) SE membrane. After doping with TiO2, a much more densely packed pellet with uniformly distributed porous structure is obtained. Changes in surface chemistry and local structure in the bulk are observed, which are believed to contribute to the improved ionic conductivity and higher critical current density of the TiO2‐doped NZSP. Stable cycling performance with reversible capacities based on different Na storage mechanisms are also demonstrated. [ABSTRACT FROM AUTHOR]

Published
2023
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