Biomass‐Derived Ion‐Selective Binder Modulates Zn 2+ Solvation Enabling High‐Capacity Cathodes in Aqueous Zinc Batteries

Abstract The electrochemical performance of aqueous zinc batteries (AZBs) critically relies on advanced binders to regulate the solvation structure of hydrated Zn 2+ and accelerate the redox kinetics at the cathode interface. However, conventional hydrophobic polyvinylidene fluoride (PVDF) binders fail to achieve this goal due to their weak interactions with H 2 O and Zn 2+ . Here, we present a bioinspired sulfate‐rich polysaccharide binder network derived from marine ι‐carrageenan (CAG), which mimics biological ion channels to enable selective ion coordination and dynamic hydration regulation. By establishing dual ion‐selective coordination sites, the zincophilic ─OSO 3 − and hydrophilic ─OH groups of CAG…

• NN
  National Natural Science Foundation of China

  Awards: 32222057, 52302223, 52572210
• NS
  Natural Science Foundation of Fujian Province

  Award: 2025J01574