期刊
CHEMICAL ENGINEERING JOURNAL
卷 439, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.135766
关键词
Electrochemical energy storage; Redox flow battery; Nonaqueous electrolyte; Molecular engineering; Naphthalimides
资金
- National Natural Science Foundation of China [21636007]
Nonaqueous redox flow batteries can achieve high energy density by utilizing N-substituted naphthalimides as stable anolyte materials with enhanced solubility through ionic modification strategy.
Nonaqueous redox flow batteries (NARFBs) hold great promise to offer high energy density due to the broader electrochemical window. However, the achieved energy density is relatively low due to the poor stability and low solubility of redox active materials. Herein, we demonstrate that N-substituted naphthalimides can be employed as stable anolyte material for NARFBs. N-(naphthalimidoethyl)-N,N-dimethyl-N-ethylammonium bis (trifluoromethane-sulfonyl)imide (NI-TFSI) was designed via an ionic modification strategy, resulting in enhanced solubility from 0.31 M to 1.22 M. The NARFB based on NI-TFSI exhibits stable cycling with 90.3% discharge capacity retention over 100 cycles and high-rate capability with the average discharge capacity of 1.27 Ah L-1 even at 120 mA cm(-2). Benefiting from the high solubility of the redox active materials, capacity of 16.3 Ah L-1 and energy density of 35.6 Wh L-1 can be achieved at 1.0 M, which represent the benchmark of highenergy-density NARFBs.
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