Cation-Selective Interface for Kinetically Enhanced Dendrite-Free Zn Anodes

摘要

The Zn anode in aqueous zinc-ion batteries (AZIBs) is severely impeded byuncontrolled dendrite growth and promiscuous water-induced side reactions,resulting in low Coulombic efficiency (CE) and poor lifetime. Herein, a versatileZn-based laponite (Zn–LT) interface is constructed for uniform and rapid Zndeposition for long-life AZIBs. The combined experimental results and theoreticalsimulations reveal that the abundant negatively charged channels in theZn–LT layer permit cation penetration but shield anions to uniformly modulateZn deposition. Moreover, Zn–LT not only acts as a desolvation layer to promoteZn deposition kinetics, but also effectively inhibit harmful Zn anode corrosion.Therefore, the functional Zn–LT interface enables the anode to deliveran average CE as high as 99.8% at 1 mA cm~(?2) and a long lifespan of >830 hat 10 mA cm~(?2) and 5 mA h cm~(?2). Moreover, the assembled MnO_2‖Zn–LT@Znfull battery exhibits prominent rate performance (123 mA h g~(?1) at 2 A g~(?1)) andlong-term cycling stability (80.4% capacity retention at 1 A g~(?1) after 700 cycles).Furthermore, the fabrication of this Zn-LT@Zn anode can be extended torolling method, reflecting the industrial manufacturing potential.