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

No Thumbnail Available
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2019-12-15
Major/Subject
Mcode
Degree programme
Language
en
Pages
Series
Journal of Power Sources, Volume 443
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.
Description
Keywords
Electrochemical energy storage, Non-aqueous redox flow battery, Separator, Stability, Supporting electrolyte
Other note
Citation
Yuan , J , Zhang , C , Zhen , Y , Zhao , Y & Li , Y 2019 , ' Enhancing the performance of an all-organic non-aqueous redox flow battery ' , Journal of Power Sources , vol. 443 , 227283 . https://doi.org/10.1016/j.jpowsour.2019.227283