Electrolyte Additive-Assembled Interconnecting Molecules–Zinc Anode Interface for Zinc-Ion Hybrid Supercapacitors

• A trace electrolyte additive (sulfobutyl-grafted β-cyclodextrin) self-assembles into an interconnecting molecular interface on zinc anodes, enhancing Zn2+ transference number and homogenizing deposition sites. • The interface accelerates desolvation of hydrated Zn2+ and suppresses parasitic reactions, achieving 99.7% Coulombic efficiency and ~30-fold increase in operation lifetime. • Zinc-ion hybrid supercapacitors with the modified anodes deliver 20,000-cycle stability and improved rate capability, bridging high energy and power densities. • This scalable interface engineering strategy offers a promising route to ultrastable, fast-kinetics zinc anodes for next-generation aqueous energy storage.