Development of rechargeable high-energy hybrid zinc-iodine aqueous batteries exploiting reversible chlorine-based redox reaction

Guojin Liang, Bochun Liang, Ao Chen, Jiaxiong Zhu, Qing Li, Zhaodong Huang, Xinliang Li, Ying Wang (), Xiaoqi Wang, Bo Xiong, Xu Jin, Shengchi Bai, Jun Fan () and Chunyi Zhi ()
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Guojin Liang: City University of Hong Kong
Bochun Liang: City University of Hong Kong
Ao Chen: City University of Hong Kong
Jiaxiong Zhu: City University of Hong Kong
Qing Li: City University of Hong Kong
Zhaodong Huang: City University of Hong Kong
Xinliang Li: City University of Hong Kong
Ying Wang: Chinese Academy of Sciences
Xiaoqi Wang: Research Center of New Energy
Bo Xiong: Research Center of New Energy
Xu Jin: Research Center of New Energy
Shengchi Bai: Research Center of New Energy
Jun Fan: City University of Hong Kong
Chunyi Zhi: City University of Hong Kong

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract The chlorine-based redox reaction (ClRR) could be exploited to produce secondary high-energy aqueous batteries. However, efficient and reversible ClRR is challenging, and it is affected by parasitic reactions such as Cl2 gas evolution and electrolyte decomposition. Here, to circumvent these issues, we use iodine as positive electrode active material in a battery system comprising a Zn metal negative electrode and a concentrated (e.g., 30 molal) ZnCl2 aqueous electrolyte solution. During cell discharge, the iodine at the positive electrode interacts with the chloride ions from the electrolyte to enable interhalogen coordinating chemistry and forming ICl3-. In this way, the redox-active halogen atoms allow a reversible three-electrons transfer reaction which, at the lab-scale cell level, translates into an initial specific discharge capacity of 612.5 mAh gI2−1 at 0.5 A gI2−1 and 25 °C (corresponding to a calculated specific energy of 905 Wh kgI2−1). We also report the assembly and testing of a Zn | |Cl-I pouch cell prototype demonstrating a discharge capacity retention of about 74% after 300 cycles at 200 mA and 25 °C (final discharge capacity of about 92 mAh).

Date: 2023
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DOI: 10.1038/s41467-023-37565-y

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