Soft Colloidal Electrode Enabled by Water Distribution Control for Ultra‐Stable Aqueous Zn–I Batteries.

Designing effective electrode material is crucial for developing ultra‐long lifetime batteries, thereby reducing daily battery costs. Current electrode materials are typically solid or liquid state, with an intermediate colloidal state offering the advantages of fixed redox‐active species, akin to solid‐state materials, and the absence of rigid atomic structure, akin to liquid‐state materials, while avoiding the particle pulverization and uncontrolled migration. Herein, an aqueous Zn||Pluronic F127 (PF127)/ZnI2 colloid battery is developed utilizing the inherent water molecular control effect of ZnSO4. In this system, ZnSO4 in the electrolyte acts as a water molecular valve, regulating the water content within the PF127 polymer to form a PF127 colloid. The resulting aqueous Zn||PF127/ZnI2 colloid battery exhibits an ultra‐long cycling lifetime and compatibility with various simulated and practical operating conditions, highlighting its potential for practical applications. Additionally, this battery design concept offers a platform for constructing ultra‐stable aqueous batteries. [ABSTRACT FROM AUTHOR]