Zn-modified zeolites host for dendrite-free zinc metal anodes

Zinc metal, featuring high theoretical capacity, low electrochemical potential and natural abundance, is an exciting anode material for aqueous energy storage devices. Unfortunately, dendrite growth of the zinc anode hinders its application. Herein, we demonstrate that the zinc-modified zeolites prepared by ion exchange in aqueous solution can be used as host with acetylene black for dendrite-free zinc plating and stripping. After introduction of well-defined zinc species, the zeolites can not only provide enlarged electroactive area to serve the fast kinetics of Zn2+, but also withstand the inside strain and stress to suppress the growth of dendrite during zinc plating and stripping process. The full batteries based on the Zn@zeolites anode and MnO2 exhibit an improved capacity and excellent self-discharge behavior. In addition, a low voltage hysteresis and improved cycling stability can be obtained in Zn/Zn symmetric cells with Zn@zeolites anode. The novel design inspires a deep comprehension of anode structure of zinc-based aqueous battery. Graphical abstract