期刊
ADVANCED MATERIALS
卷 34, 期 31, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202202898
关键词
carbon nanotubes; in situ transmission electron microscopy; sodium metal anode; Zn single atom
类别
资金
- NSFC [U1805254, 21773192, 22072117, 22179112]
- Fundamental Research Funds for the Central Universities [20720200075]
- Double-First Class Foundation of Materials and Intelligent Manufacturing Discipline of Xiamen University
This study achieves highly reversible encapsulation-based sodium storage by designing a functional hollow carbon nanotube with Zn single atom sites embedded in the carbon shell. The design reduces the nucleation barrier of Na deposition and provides excellent ion/electron transport channels, improving the safety and cycling performance of the sodium metal anode.
The properties of high theoretical capacity, low cost, and large potential of metallic sodium (Na) has strongly promoted the development of rechargeable sodium-based batteries. However, the issues of infinite volume variation, unstable solid electrolyte interphase (SEI), and dendritic sodium causes a rapid decline in performance and notorious safety hazards. Herein, a highly reversible encapsulation-based sodium storage by designing a functional hollow carbon nanotube with Zn single atom sites embedded in the carbon shell (Zn-SA-HCNT) is achieved. The appropriate tube space can encapsulate bulk sodium inside; the inner enriched Zn-SA sites provide abundant sodiophilic sites, which can evidently reduce the nucleation barrier of Na deposition. Moreover, the carbon shell derived from ZIF-8 provides geometric constraints and excellent ion/electron transport channels for the rapid transfer of Na+ due to its pore-rich shell, which can be revealed by in situ transmission electron microscopy (TEM). As expected, Na@Zn-SA-HCNT anodes present steady long-term performance in symmetrical battery (>900 h at 10 mA cm(-2)). Moreover, superior electrochemical performance of Na@Zn-SA-HCNT||PB full cells can be delivered. This work develops a new strategy based on carbon nanotube encapsulation of metallic sodium, which improves the safety and cycling performance of sodium metal anode.
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