Stabilizing Zinc Anodes via a Zeolite‐Induced Localized Supersaturated Electrolyte Interface

ABSTRACT Aqueous Zn‐ion batteries (AZIBs) hold great potential for cost‐effective and safe grid‐scale energy storage, yet their lifespan is limited by dendrite growth and side reactions arising from an unstable electrode/electrolyte interface. Although high‐concentration electrolytes can tune solvation structure and enhance Zn plating/stripping stability, they suffer from high cost and low practicality. Herein, we propose a localized supersaturated electrolyte interface (LSEI) concept via constructing a low Si/Al ratio ZSM‐5 zeolite (LZ5) interphase on the Zn surface. The abundant Brønsted acid sites inside the LZ5 nanochannels function as “ion tentacles” to spontaneously capture and confine Zn 2+ , dramatically raising the localized Zn 2+ concentration on the Zn surface even in a dilute ZnSO 4 electrolyte (1 M). This LSEI creates a H 2 O‐deficient and anion‐enriched Zn 2+ solvation structure at the LZ5 interface, which concurrently accelerates Zn 2+ desolvation and transport dynamics for dendrite‐free deposition and suppresses H 2 O‐induced side reactions. Consequently, the LZ5@Zn symmetric cells deliver a lifespan of over 2400 h and a high cumulative capacity exceeding 5.5 Ah cm −2 . The assembled LZ5@Zn//NH 4 V 4 O 10 full cells achieve 96% capacity retention over 1200 cycles at 3 A g −1 . Our findings highlight the potential of LSEI design for developing durable Zn anodes toward practical AZIBs.