Dynamic Polyiodide‐Trapping and Proton‐Capturing Dual‐Network Engineering for High‐Areal‐Capacity, Long‐Cycling and High‐Temperature Zn─I 2 Batteries

ABSTRACT Aqueous zinc–iodine (Zn─I 2 ) batteries demonstrate great potential in the large‐scale grid‐scale energy storage. However, severe polyiodide shuttling and interfacial parasitic reactions limit the practical application of aqueous Zn─I 2 batteries with high iodine loading. Here, aminonicotinic acid (AMI) is first introduced in this work to address these issues by dynamic polyiodide‐trapping and proton‐capturing dual‐network engineering. The abundant active sites on AMI effectively trap the I 3 − ions for inhibiting the polyiodide dissolution and migration in the electrolyte. Moreover, AMI reversibly captures H + ions and neutralizes OH − ions, thereby effectively mitigating pH fluctuations to suppress…

• NN
  National Natural Science Foundation of China

  Awards: 22578083, 22308066
• NS
  Natural Science Foundation of Guangxi Province

  Award: 2024GXNSFAA010271