3D Porous Fibers with Spatial Traps and Excellent Zn 2+ Transport Kinetics Enable Stable Zn‐Based Aqueous Battery

Abstract Adverse side reactions and uncontrolled Zn dendrites growth are the dominant factors that have restricted the application of Zn ion batteries. Herein, a 3D self‐supporting porous carbon fibers (denoted as PCFs) host is developed with “trap” effect to adjust the Zn deposition. The unique open structural design of N‐doped carbon can act as the zincophilic sites to induce uniform deposition and inhibit adverse side reactions. More importantly, the porous hollow PCFs host with “trap” effect can induce Zn deposition in the fiber by adjusting the local electric field and current density, thereby increasing the specific energy density of the battery and inhibiting dendrite growth. In addition, the 3D open frameworks can regulate Zn 2+ flux to enable outstanding cycling performance at ultra‐high current densities. As expected, the PCFs framework guarantees the uniform Zn plating and stripping with an outstanding stability over 6000 cycles at the current density of 40 mA cm −2 . And the Zn@PCFs||MnO 2 full battery shows an excellent lifespan over 1300 cycles at 2000 mA g −1 .