Ionic Selective Separator Design Enables Long‐Life Zinc–Iodine Batteries via Synergistic Anode Stabilization and Polyiodide Shuttle Suppression

• DOI: 10.1002/adfm.202410712
• Publication Date: 2024-08-24T12:12:26Z
• Authors: Peng Yang; Kai Zhang; Shizhuo Liu; Wubin Zhuang; Zhipeng Shao; Kaiping Zhu; Lin Lin; Gengde Guo; Wenhui Wang; Qichong Zhang; Yagang Yao
• Keywords: Separator (oil production); Galvanic anode

Abstract Aqueous zinc–iodine batteries show immense potential in the electrochemical energy storage field due to their intrinsic safety and cost‐effectiveness. However, rampant dendritic growth continuous side reactions on zinc anode, coupled with shuttling phenomenon of polyiodides, severely affect cyclic life. In response, this study utilizes a carboxyl‐functionalized metal‐organic framework UiO‐66‐(COOH) 2 (UC) modify commercial glass fiber (GF) develop novel ionic selective separator (UC/GF). This exhibits cation exchange ability for Zn 2+ thereby simultaneously stabilizing anode inhibiting shuttle effect polyiodides. Enhanced by abundant polar carboxyl groups, UC/GF can effectively facilitate ion transport accelerate desolvation hydrated ions its zincophilicity hydrophilicity, while significantly hindering transfer polyiodides via electrostatic repulsion. Consequently, Zn|UC/GF|Zn symmetric battery enables long lifespan over 3400 h at current density 5.0 mA cm −2 , Zn|UC/GF|I an exceptional discharge capacity 103.8 mAh g −1 after 35 000 cycles 10 C decay rate only 0.0013% per cycle. modification strategy that synergistically optimizes cathode performance provides unique insights into commercialization batteries.