Aqueous Zinc-bromine Battery with Highly Reversible Bromine Conversion Chemistry
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(Published version)
Date
2025
Authors
Zhao, X.
Hao, J.
Chen, Q.
Zhang, S.-J.
Wu, H.
Mao, L.
Qiao, S.
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Journal article
Citation
Angewandte Chemie International Edition, 2025; 64(20):e202502386-1-e202502386-10
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Xun Zhao, Junnan Hao, Qianru Chen, Shao-Jian Zhang, Han Wu, Lei Mao, and Shi-Zhang Qiao
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Abstract
Br2/Br conversion reaction with a high operating potential (1.85 V vs. Zn2+/Zn) is promising for designing high-energy cathodes in aqueous Zn batteries. However, the ultrahigh solubility of polybromides causes significant shuttle effects, capacity deterioration, and self-discharge, rendering the study of static zincbromine batteries still in its infancy. Here, various aqueous zinc salt electrolytes are first screened, showing that, compared to other salts, ZnSO4 is more suitable for Br-based cathodes benefiting from its higher negative charge density and lower cost. Nevertheless, the significant shuttle effect of polybromides remains in such an electrolyte. We further develop a targeted sequestration strategy to fundamentally confine polybromide migration from KBr cathode into electrolyte. In high-massloading (22 mgKBr cm 2 ) pouch cells, the average Coulombic efficiency enhances from 92.3% to 99.8%, and self-discharge performance dramatically improves from 17.4% capacity retention to 85.2% after 72 h of resting, indicating the effectiveness of our strategy in confining the shuttle effects. Furthermore, an Ah-scale pouch cell delivers an average Coulombic efficiency of 99.88% and a zinc utilization of 22% at a high rate of 3 C. Our findings also pave the way for the design of advanced Br-based cathodes.
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First published: 25 February 2025
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© 2025 The Author(s). Angewandte Chemie International Edition published by Wiley-VCH GmbH This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.