In:
Advanced Materials, Wiley, Vol. 34, No. 15 ( 2022-04)
Abstract:
The metal anode is the pivotal component for advanced sodium‐metal batteries such as Na–O 2 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 Ti 3 C 2 (h‐Ti 3 C 2 ) 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‐Ti 3 C 2 ) 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–O 2 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.
Type of Medium:
Online Resource
ISSN:
0935-9648
,
1521-4095
DOI:
10.1002/adma.202106565
Language:
English
Publisher:
Wiley
Publication Date:
2022
detail.hit.zdb_id:
1474949-X
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