High-conversion-efficiency and stable six-electron Zn–I 2 batteries enabled by organic iodide/thiazole-linked covalent organic frameworks

Thiazole-linked covalent organic framework hosted trimethylsulfonium iodide is designed to start high-conversion-efficiency 6e − I − /I 5+ conversion, giving Zn–I 2 batteries a record high capacity (1296 mA h g −1 ) and energy density (1464 W h kg −1 ).