Collagen‐Mediated Solvent Sheathing and Derived Interfacial Manipulation Toward Ultrahigh‐Rate Zn Anodes

Abstract The zinc (Zn) anode in zinc‐ion batteries suffers from potential defects such as wild dendrite growth, severe Zn corrosion, and violent hydrogen evolution reaction, inducing erratic interfacial charge transfer kinetics, which eventually leads to electrochemical failure. Here, collagen, a biomacromolecule, is added to achieve the reconstruction of the electrolyte hydrogen‐bonding network and the modification of the derived Zn interface. Benefiting from the electronegativity advantage of amino groups (‐NH₂) in collagen, the Zn (002) crystal plane is preferentially exposed and the solid electrolyte interface (SEI) rich in ZnF₂ and Zn₃N₂ promotes the rapid charge transfer of Zn anode. Thence, an impressive cumulative capacity of 7,500 mAh cm⁻² at 30 mA cm⁻² is achieved and the assembled Zn|VO₂ cell exhibited robust cycle reversibility even when subject to a maximum current of 100 A g⁻¹ and an ultra‐long cycle life of 20,000 cycles at 50 A g⁻¹, with a single‐cycle capacity loss as low as 0.0021%. Such a convenient strategy of solvent sheathing regulation and derived interfacial manipulation opening up a promising universal approach toward long‐life and high‐rate Zn anodes.