我室王鸣生教授和董全峰教授在 Advanced Materials 上发表论文：An Encapsulation-Based Sodium Storage via Zn-Single-Atom Implanted Carbon Nanotubes

摘要：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.

文章链接：https://onlinelibrary.wiley.com/doi/10.1002/adma.202202898