Improved Cathode Chemistry Reduces Self-Discharge in Large-Scale Zinc-Iodine Batteries

Enhancing Aqueous Zinc-Iodine Batteries for Grid-Scale Energy Storage

The conventional hosts for iodine cathodes in aqueous zinc batteries often exhibit slow reactions and poor electrochemical reproducibility. To address this issue, a research team led by Professor Shizhang Qiao, Chair of Nanotechnology at the University of Adelaide’s School of Chemical Engineering, explored the use of ferrocene in the cathodes.

Their groundbreaking findings were detailed in the prestigious journal Nature Chemistry.

Professor Qiao explained, “The use of ferrocene in aqueous zinc-iodine batteries can mitigate the polyiodides shuttle effect, a common challenge in these batteries. Ferrocene, an organometallic compound, has the ability to precipitate polyiodides, thus reducing self-discharge rates significantly.”

He further added, “With ferrocene comprising low-cost elements, it offers scalability and cost-efficiency for large-scale production. Simulation results indicate a 9% reduction in total battery cost when ferrocene is incorporated.”

The incorporation of ferrocene not only eliminates the shuttle effect but also enhances energy density while reducing overall costs, making it a viable strategy for advancing aqueous zinc-iodine battery technologies.

Professor Qiao emphasized, “Our research showcases that active mass in the cathode can achieve up to 88%, minimizing capacity loss from inactive hosts.”

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