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

Jiashu Yuan, Cuijuan Zhang*, Yihan Zhen, Yicheng Zhao, Yongdan Li

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

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.

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

Keywords

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

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