Stabilizing Multi‐Electron NASICON‐Na<subscript>1.5</subscript>V<subscript>0.5</subscript>Nb<subscript>1.5</subscript>(PO<subscript>4</subscript>)<subscript>3</subscript> Anode via Structural Modulation for Long‐Life Sodium‐Ion Batteries.
In: Advanced Energy Materials, Jg. 14 (2024-05-01), Heft 17, S. 1-13
Online
academicJournal
Zugriff:
Multi‐electron NAtrium SuperIonic CONductor (NASICON)‐Nb2(PO4)3 (N0NbP) is an attractive Na‐ion battery anode, owing to its low intercalation voltage (1.4 V vs Na+/Na0) and high capacity (≈150 mAh g−1). However, it suffers from poor capacity retention due to structural degradation. To overcome this issue, extra Na+ ions are introduced at the Na(1) sites, via V3+ substitution, which can act as stabilizing agents to hold lantern units together during cycling, producing NASICON‐Na1.5V0.5Nb1.5(PO4)3 (N1.5VNbP). The N1.5VNbP anode exhibits reversible capacities of ≈140 mAh g−1 at 1.4 V versus Na+/Na0 through Nb5+/Nb4+/Nb3+ and V3+/V2+ redox activities. The extra Na+ ions in the framework forms a complete solid‐solution during Na (de)intercalation and enhances sodium diffusivity, in agreement with first‐principles calculations. Further, N1.5VNbP demonstrates extraordinary cycling (89% capacity retention at 5C after 500 cycles) and rate performances (105 mAh g−1 at 5C). Upon pairing the N1.5VNbP anode with the NASICON‐Na3V2(PO4)3 cathode, the full Na‐ion cell delivers a remarkable energy density of 98 Wh kg−1 (based on the mass of anode and cathode) and retains 80% of its capacity at 5C rate over 1000 cycles. The study opens new possibilities for enhancing the electrochemical performance of NASICON anodes via chemical and structural modulations. [ABSTRACT FROM AUTHOR]
Titel: |
Stabilizing Multi‐Electron NASICON‐Na<subscript>1.5</subscript>V<subscript>0.5</subscript>Nb<subscript>1.5</subscript>(PO<subscript>4</subscript>)<subscript>3</subscript> Anode via Structural Modulation for Long‐Life Sodium‐Ion Batteries.
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Autor/in / Beteiligte Person: | Patra, Biplab ; Hegde, Rashmi ; Natarajan, Anirudh ; Deb, Debolina ; Sachdeva, Dorothy ; Ravishankar, Narayanan ; Kumar, Keshav ; Gautam, Gopalakrishnan Sai ; Senguttuvan, Premkumar |
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Zeitschrift: | Advanced Energy Materials, Jg. 14 (2024-05-01), Heft 17, S. 1-13 |
Veröffentlichung: | 2024 |
Medientyp: | academicJournal |
ISSN: | 1614-6832 (print) |
DOI: | 10.1002/aenm.202304091 |
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