Cation‐Conduction Dominated Hydrogels for Durable Zinc–Iodine Batteries

Abstract Zinc–iodine batteries have the potential to offer high energy‐density aqueous energy storage, but their lifetime is limited by the rampant dendrite growth and the concurrent parasite side reactions on the Zn anode, as well as the shuttling of polyiodides. Herein, a cation‐conduction dominated hydrogel electrolyte is designed to holistically enhance the stability of both zinc anode and iodine cathode. In this hydrogel electrolyte, anions are covalently anchored on hydrogel chains, and the major mobile ions in the electrolyte are restricted to be Zn 2+ . Specifically, such a cation‐conductive electrolyte results in a high zinc ion transference number (0.81) within the hydrogel and guides epitaxial Zn…

• MO
  Ministry of Education - Singapore

  Award: MOE‐T2EP50121‐0006
• NN
  National Natural Science Foundation of China

  Award: 22209124
• CS
  China Scholarship Council

  Award: 202006210070
• FR
  Fundamental Research Funds for the Central Universities

  Award: 2042023kf0115