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Design Strategies and Advanced Methods for Cathode Engineering in Aqueous Zinc-Iodine Batteries.

Derong Liu1, Zhao Wang1, Dian Zhao1

  • 1College of Chemistry, Huazhong Agricultural University, Wuhan, 430070, P. R. China.

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Summary

Aqueous zinc-iodine batteries (AZIBs) offer a sustainable energy solution. This review details strategies for designing advanced iodine cathodes to overcome challenges like shuttling and improve battery performance.

Keywords:
iodine cathodepolyiodide shuttlereaction mechanismtwo and multi‐electron redoxzinc‐iodine battery

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Aqueous zinc-iodine batteries (AZIBs) are emerging as safe, cost-effective, and sustainable energy storage systems.
  • The iodine cathode is critical for AZIB performance but faces challenges like polyiodide shuttling, hydrolysis, and slow kinetics.

Purpose of the Study:

  • To systematically review recent advancements in iodine cathode design strategies for AZIBs.
  • To highlight methods for enhancing iodine confinement, promoting multi-electron redox reactions, and improving kinetics.

Main Methods:

  • Literature review of recent research on iodine cathode materials and design.
  • Analysis of material structures and interaction mechanisms influencing AZIB performance.
  • Categorization of strategies for two-electron and multi-electron AZIBs.

Main Results:

  • Various design strategies effectively address polyiodide shuttling and hydrolysis.
  • Optimized cathode structures improve redox kinetics and multi-electron utilization.
  • Significant progress has been made in enhancing the capacity and stability of iodine cathodes.

Conclusions:

  • Rational design of iodine cathodes is crucial for high-performance AZIBs.
  • Further research into material structures and interaction mechanisms will drive innovation.
  • Future work should focus on developing long-life, high-energy-density AZIBs.