Volume 9, Issue 4 2401434
Research Article

A Long-Life Zinc-Bromine Single-Flow Battery Utilizing Trimethylsulfoxonium Bromide as Complexing Agent

Ming Zhao

Ming Zhao

Division of Energy Storage, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023 China

School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing, 100049 China

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Tao Cheng

Tao Cheng

Division of Energy Storage, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023 China

School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing, 100049 China

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Tianyu Li

Tianyu Li

Division of Energy Storage, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023 China

Key Laboratory of Long-Duration and Large-Scale Energy Storage, Chinese Academy of Sciences, Dalian, 116023 China

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Congxin Xie

Congxin Xie

Division of Energy Storage, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023 China

Key Laboratory of Long-Duration and Large-Scale Energy Storage, Chinese Academy of Sciences, Dalian, 116023 China

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Yanbin Yin

Corresponding Author

Yanbin Yin

Division of Energy Storage, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023 China

Key Laboratory of Long-Duration and Large-Scale Energy Storage, Chinese Academy of Sciences, Dalian, 116023 China

E-mail: [email protected]; [email protected]

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Xianfeng Li

Corresponding Author

Xianfeng Li

Division of Energy Storage, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023 China

Key Laboratory of Long-Duration and Large-Scale Energy Storage, Chinese Academy of Sciences, Dalian, 116023 China

E-mail: [email protected]; [email protected]

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First published: 03 February 2025
Citations: 4

Abstract

Aqueous zinc-bromine single-flow batteries (ZBSFBs) are highly promising for distributed energy storage systems due to their safety, low cost, and relatively high energy density. However, the limited operational lifespan of ZBSFBs poses a significant barrier to their large-scale commercial viability. Here, trimethylsulfoxonium bromide (TMSO), a nonquaternary ammonium salt, is introduced as a bromine complexing agent to extend the cycle life of ZBSFBs by reducing the imbalance of active substances. Benefiting from the strong interaction between TMSO and H2O, the hydrogen evolution reaction is notably suppressed compared with the traditional N-ethyl-N-methyl-pyrrolidinium bromide (MEP) complexing agent, resulting in reduced bromine accumulation at the cathode. The resultant solid polybromide-TMSO complex, featuring rapid electrochemical redox reaction of Br2/Br, further contributes to reduce the residual bromine. Consequently, the ZBSFB with TMSO demonstrates a longer lifespan of 1500 cycles with a higher average energy efficiency (EE) of ≈81.6% than that with MEP (less than 300 cycles with an average EE of ≈80.2%). This research explores a sulfonium complexing agent and provides a feasible strategy to effectively extend the cycle life of ZBSFBs.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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