An MXene-Based Metal Anode with Stepped Sodiophilic Gradient Structure Enables a Large Current Density for Rechargeable Na-O2 Batteries
© 2022 Wiley-VCH GmbH.
| Veröffentlicht in: | Advanced materials (Deerfield Beach, Fla.). - 1998. - 34(2022), 15 vom: 30. Apr., Seite e2106565 |
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| 1. Verfasser: | |
| Weitere Verfasser: | , , , , , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2022
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| Zugriff auf das übergeordnete Werk: | Advanced materials (Deerfield Beach, Fla.) |
| Schlagworte: | Journal Article 3D MXene scaffolds Na-O2 battery dendrite-free Na anodes large current density stepped sodiophilic gradient |
| Zusammenfassung: | © 2022 Wiley-VCH GmbH. The metal anode is the pivotal component for advanced sodium-metal batteries such as Na-O2 batteries. Designing a 3D confinement scaffold is a promising strategy for constructing dendrite-free sodium-metal anodes; however, cycling stability at a large current density (>10 mA cm-2 ) is still difficult to realize. Herein, the design of new lightweight and fibrous hydroxylated Ti3 C2 (h-Ti3 C2 ) MXene based scaffolds with stepped sodiophilic gradient structure (h-M-SSG) is reported, and its thickness can be controlled (80-250 µm). The sodiophilic gradient structure (adjusted by h-Ti3 C2 ) can effectively induce sodium ions to preferentially deposit at the bottom of the scaffold, thus inhibiting dendrite growth. h-M-SSG/Na-based symmetrical batteries exhibit a low polarization voltage and long cycling life at a high current density (40 mA cm-2 ) and a high cut-off capacity (40 mAh cm-2 ). Moreover, a Na-O2 battery with an h-M-SSG/Na anode exhibits a low potential gap of 0.137 V after 45 cycles at 1000 mA g-1 and 1000 mAh g-1 . This deposition-regulation strategy would inspire the design of 3D scaffolds for high-performance sodium-metal-anode-based batteries |
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| Beschreibung: | Date Revised 14.04.2022 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
| ISSN: | 1521-4095 |
| DOI: | 10.1002/adma.202106565 |