Enhancing the performance of an all-organic non-aqueous redox flow battery

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • Jiashu Yuan
  • Cuijuan Zhang
  • Yihan Zhen
  • Yicheng Zhao
  • Yongdan Li

Research units

  • Tianjin University
  • Collaborative Innovation Center of Chemical Science and Engineering Tianjin

Abstract

The non-aqueous redox flow battery (NARFB) is a promising device for grid-scale energy storage. However, its electrochemical performance and long-term stability still need to be improved. This work shows that the electrochemical performance of NARFB can be remarkably enhanced by optimizing the supporting electrolyte and separator. The battery with 2,1,3-benzothiadiazole (BzNSN) as anolyte, 2,5-di-tert-butyl-1-methoxy-4-[2′-methoxyethoxy]benzene (DBMMB) as catholyte, tetraethylammonium bis(trifluoromethylsulfonyl)imide (TEATFSI) as supporting electrolyte, and porous Daramic 250 separator delivers an average discharge capacity of 1.7 Ah L−1, voltage efficiency of 87.8%, Coulombic efficiency of 89.1%, and energy efficiency of 78.3% over 100 cycles at the current density of 40 mA cm−2 with 0.1 M active materials. The reasons for the capacity decay over cycling in terms of electrolyte leakage, crossover, and chemical decomposition are discussed.

Details

Original languageEnglish
Article number227283
JournalJournal of Power Sources
Volume443
Publication statusPublished - 15 Dec 2019
MoE publication typeA1 Journal article-refereed

    Research areas

  • Electrochemical energy storage, Non-aqueous redox flow battery, Separator, Stability, Supporting electrolyte

ID: 37941801