One Month Static Storage Tolerant Zn Anodes With 3800 Hour Cycling Enabled by a Bio‐Derived Bidentate Chelation Additive Through Solvation Sheath Reconstruction and Interfacial Regulation

Aqueous zinc‐ion batteries (AZIBs) face a critical challenge rooted in the vicious cycle of dendrite growth and parasitic reactions at the zinc anode. This study introduces hydrolyzed fish collagen (HFC) as a novel multifunctional electrolyte additive to address this issue. The carbonyl oxygen and pyrrole nitrogen atoms on its molecular chains establish bidentate chelation with Zn 2+ , effectively restructuring the solvation sheath. This restructuring facilitates desolvation, lowers water activity, guides uniform Zn deposition, suppresses the hydrogen evolution reaction (HER), and buffers pH fluctuations. Concurrently, HFC enhances interfacial stability through chemical bonding interactions, thereby inhibiting both dendrite proliferation and corrosion. As a result, a Zn||Zn symmetric cell with HFC achieves exceptional cycling stability for 2800 h at 1 mA cm −2 . Notably, even after one month of static storage, the symmetric cell maintains stable operation for over 3800 h. Moreover, Zn||VO and Zn||AC cells both demonstrate excellent rate capability and cycling stability. This work proposes a fresh perspective for designing electrolyte additives to enable multidimensional and synergistic stabilization of zinc metal anodes.