Dendrite‐Free Li Metal Anode Achieved by Bi‐Functional Host of NH2‐Modified UiO‐66 on Zn‐Embedded Porous Carbon Nanofibers

Abstract 3D carbonaceous host is considered as an ideal candidate for stabilizing Li metal anode (LMA) owing to its lightweight and high electronic conductivity. Nonetheless, the surface chemistries of carbon materials at different locations should be regulated to modify the lithiophilicity and ion diffusion. In this study, a metal–organic frameworks‐engaged strategy to design a core–shell porous host with mixed ionic/electronic conducting feature is developed. To be specific, Zn‐embedded porous carbon nanofibers (Zn/CF) are designed as electronic conducting cores using ZIF‐8 particles as precursors and pore‐forming agents. Meanwhile, NH 2 ‐functionalized UiO‐66 (NH 2 ‐UiO‐66) nanoparticles are in‐situ grown on the above carbon fibers for promoted ions migration. As a result, the composite LMA using this bi‐functional Zn/CF@NH 2 ‐UiO‐66 host demonstrates enhanced stability and rate performance. Particularly, the obtained asymmetric cell delivers a stable operation up to 500 cycles at 1 mA cm −2 . Moreover, the corresponding Li‐Zn/CF@NH 2 ‐UiO‐66//LiFePO 4 full cell shows a high‐capacity retention of 93.4% over 1700 cycles at 2 C (1 C ≈169 mA g −1 ).