Abstract
Nonaqueous redox flow batteries (NARFBs) have promise for large-scale energy storage with high energy density. Developing advanced active materials is of paramount importance to achieve high stability and energy density. Herein, we adopt the molecular engineering strategy by coupling tetraalkylammonium and an ethylene glycol ether side chain to design anthraquinone-based ionic active species. By adjusting the length of the ethylene glycol ether chain, an ionic active species 2-((9,10-dioxo-9,10-dihydroanthracen-1-yl)amino)-N-(2-(2-methoxyethoxy)ethyl)-(N,N-dimethylethan-1-aminium)-bis(trifluoromethylsulfonyl)imide (AQEG2TFSI) with high solubility and stability is obtained. Paired with a FcNTFSI cathode, the full battery provides an impressive cycling performance with discharge capacity retentions of 99.96% and 99.74% per cycle over 100 cycles with 0.1 and 0.4 M AQEG2TFSI, respectively.
| Original language | English |
|---|---|
| Pages (from-to) | 17369–17377 |
| Number of pages | 9 |
| Journal | ACS Applied Materials and Interfaces |
| Volume | 14 |
| Issue number | 15 |
| Early online date | 7 Apr 2022 |
| DOIs | |
| Publication status | Published - 20 Apr 2022 |
| MoE publication type | A1 Journal article-refereed |
Keywords
- energy storage
- ionic anthraquinone
- molecular modification
- nonaqueous RFB
- side chain
