Nonlinear Kinetic Optimization via Strong–Weak Cosolvent Synergy in Aqueous Zinc Batteries

Cosolvent engineering for aqueous Zn metal batteries has traditionally emphasized thermodynamic stabilization, whereas the kinetic dimension of Zn 2+ charge transfer—particularly in multi‐cosolvent systems—remains far less understood. Here we conduct a systematic study on a dual‐cosolvent electrolyte pairing a strong cosolvent (DMSO) with a weak cosolvent (DMC). Through spatial decoupling, the strong cosolvent directly coordinates to stabilize the primary solvation shell, while the weak cosolvent forms a dynamic outer‐shell buffer. This unique context modulates Zn–ligand binding, facilitates desolvation, and guides the formation of a regulated SEI. Consequently, this architecture preserves comparably high thermodynamic stability while unlocking a nonlinear kinetic optimization exclusive to the dual‐cosolvent regime. Using a multi‐descriptor framework, we demonstrate a ∼40% reduction in the charge‐transfer barrier relative to single‐cosolvent systems. This kinetic enhancement translates into robust practical performance, establishing strong–weak cosolvent synergy as a versatile design principle for next‐generation aqueous batteries.