Coordinated Solvation and Interphase Regulation by Sodium p-Aminobenzenesulfonate for Long-Life Aqueous Zinc-Ion Batteries

Aqueous zinc-ion batteries (AZIBs) have garnered considerable attention due to their superior safety, affordability, and eco-friendliness. However, the uncontrolled growth of zinc dendrites and the parasitic hydrogen evolution reaction (HER) severely limit their cycling stability and practical lifespan. In this study, sodium p -aminobenzenesulfonate (SABS) is introduced into ZnSO 4 -based electrolytes as a functional additive. SABS not only reconstructs the Zn 2+ solvation sheath but also forms stable complexes with Zn 2+ , facilitating the in-situ formation of a robust three-dimensional networked solid electrolyte interphase (SEI) on the zinc anode surface. As a result, Zn||Zn symmetric cells exhibit ultra-stable cycling performance exceeding 2000 h at 1 mA cm −2 , while Zn||Cu asymmetric cells maintain over 2000 cycles at 5 mA cm −2 with high Coulombic efficiency. The underlying mechanism of interfacial stabilization and SEI-like interphase formation is further elucidated by combining ex situ structural/chemical characterizations with density functional theory (DFT) calculations. Moreover, the Zn||I 2 @AC full cell containing SABS additives exhibits excellent specific capacity and long-term cycling performance over a wide range of current densities. This work provides a promising electrolyte additive strategy to enhance the interfacial stability and electrochemical performance of AZIBs through coordinated solvation and interphase regulation.