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Breakthrough in Zinc Iodine Battery Technology Enhances Conversion Kinetics and Capacity

Strategic Insights

— 2 min read

Researchers from the Royal Melbourne Institute of Technology - RMIT University have made a significant breakthrough in zinc iodine battery technology, addressing the issues of sluggish iodine redox reaction and shuttling effect of the polyiodides. By developing amorphous cobalt phosphide grown on activated carbon (ACoP@C) as an iodine host material, the team has demonstrated enhanced redox mechanisms of the iodine species, resulting in high capacities of 173.7 mA h g at 0.1 A g and 99.0 mA h g at 5.0 A g, along with a stable long cycle capacity of 80.0 mA h g over 850 cycles at 1.0 A g.

Key Takeaways:

  • The development of amorphous cobalt phosphide grown on activated carbon (ACoP@C) as an iodine host material significantly reduces shuttling and enhances the conversion kinetics of iodine species.
  • The ACoP@C material offers numerous iodine anchoring sites and proposed electrocatalytic properties, leading to rapid and continuous long-range electron and ion transport.
  • The conductive carbon substrate with abundant porous channels facilitates rapid and continuous long-range electron and ion transport.
  • The research demonstrated high capacities of 173.7 mA h g at 0.1 A g and 99.0 mA h g at 5.0 A g, along with a stable long cycle capacity of 80.0 mA h g over 850 cycles at 1.0 A g.
  • The findings provide valuable insights for the design and development of efficient amorphous catalyst materials for future zinc iodine batteries.
  • The research was funded by the Australian Research Council, Australian Government, RMIT University, Australian Renewable Energy Agency, and Australia-Spain Network for Innovation and Research Excellence.
  • Additional authors of the research include Yang Fu, Xiaorui Zheng, Hua Fan, Shiwen Wang, Hui Li, and Tianyi Ma.

Statistics:

  • The research demonstrated capacities of 173.7 mA h g at 0.1 A g and 99.0 mA h g at 5.0 A g.
  • The stable long cycle capacity of the ACoP@C/I cathode was 80.0 mA h g over 850 cycles at 1.0 A g.
  • The research was published in the journal Chemical & Bio Engineering, volume 2, issue 6, pages 341-349.
  • The research has been peer-reviewed.
  • The citations for this news report include: NewsRx, Royal Melbourne Institute of Technology - RMIT University Reports Findings in Science (Enhanced Adsorption-Catalytic Conversion of Iodine Species by Amorphous CoP@C Host Materials for Zinc Iodine Battery).

Sources:

  • NewsRx. Royal Melbourne Institute of Technology - RMIT University Reports Findings in Science (Enhanced Adsorption-Catalytic Conversion of Iodine Species by Amorphous CoP@C Host Materials for Zinc Iodine Battery). Chemicals & Chemistry. July 18, 2025; p 3396.
  • Enhanced Adsorption-Catalytic Conversion of Iodine Species by Amorphous CoP@C Host Materials for Zinc Iodine Battery. Chem & Bio Engineering, 2025;2(6):341-349.

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