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Thermo-electrochemical modeling of thermally regenerative flow batteries

Author

Listed:
  • Cai, Yuhao
  • Qian, Xin
  • Su, Ruihang
  • Jia, Xiongjie
  • Ying, Jinhui
  • Zhao, Tianshou
  • Jiang, Haoran

Abstract

Thermally regenerative flow batteries are promising for harvesting the ubiquitous low-grade heat energy. Efforts have been made to improve the performance of this type of battery by focusing mainly on thermodynamics perspectives, but ignoring the mass transfer and electrochemical kinetics of the battery. In this work, a thermo-electrochemical model is developed for analyzing effects of the heat transfer irreversibility, overpotential losses, mass transfer, and temperature-dependent resistances on the energy conversion, based on which a five-dimensional performance evaluation framework is proposed for the first time. Results show that the Nernstian loss, concentration loss, and ohmic loss are the main limiting steps for thermo-electricity conversion, and a trade-off between different performance indices exists. To realize the synergistic improvement of the thermo-electrochemical performance, a multi-objective optimization scheme based on a genetic algorithm is developed, and a power density of 13.22 μW cm−2, thermal efficiency of 8.17%, output-voltage efficiency of 48.17%, exergy efficiency of 46.47% and ecological coefficient of performance of 1.23 is achieved, which is among the highest performance in the open literature. The methods and results reported here pave a new way for the design and optimization of thermally regenerative flow batteries.

Suggested Citation

  • Cai, Yuhao & Qian, Xin & Su, Ruihang & Jia, Xiongjie & Ying, Jinhui & Zhao, Tianshou & Jiang, Haoran, 2024. "Thermo-electrochemical modeling of thermally regenerative flow batteries," Applied Energy, Elsevier, vol. 355(C).
    • Handle: RePEc:eee:appene:v:355:y:2024:i:c:s0306261923015684
    DOI: 10.1016/j.apenergy.2023.122204
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