期刊
MATERIALS TODAY ENERGY
卷 21, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.mtener.2021.100763
关键词
Bromine-based flow battery; Porous composite membrane; Functional separation layer; Bromine capturing ability; Inhibited self-discharge reaction
资金
- National Natural Science Foundation of China [21935003, 21908217, 51677176]
- DICPQIBEBT [UN201707]
- DICP [DICP I202026]
- Liaoning Natural Science Foundation
- CAS Engineering Laboratory for Electrochemical Energy Storage
A porous composite membrane with a highly selective separation layer is designed for bromine-based flow batteries, which can effectively capture diffused bromine and suppress self-discharge, leading to improved efficiency and stability of the battery.
Bromine-based flow batteries (Br-FBs) are receiving more and more attention because of the high potential, high solubility, and low cost of the Br-2/Br- redox couple. However, the self-discharge reaction caused by the bromine diffusion leads to serious and irreversible capacity decay of Br-FBs. Herein, a porous composite membrane is designed for Br-FBs, upon which a highly selective separation layer is constructed by introducing a bromine complexing agent. Apart from the intrinsically high selectivity on bromine, the complexing agent in the non-porous selective layer can complex with diffused bromine. Therefore, diffused bromine is captured by the separation layer, consequently suppressing the self-discharging of the battery. The zinc-bromine single flow battery (ZBSFB) assembled with the prepared porous composite membrane demonstrates a Coulombic efficiency of 97.42% and an energy efficiency of 85.31% at 40 mA/cm(2). Moreover, this battery can operate stably at a high current density of 140 mA/cm(2), much higher than that of the pristine membrane matrix (only 40 mA/cm(2)), enabling a higher-power density ZBSFB. Most importantly, this ZBSFB exhibits a much higher capacity retention rate after resting for 24 h than that based on a pristine membrane matrix (69.3% vs. 35.7%), suggesting a dramatically improved membrane selectivity. Therefore, the designed porous composite membranes can be a very promising prospect for Br-FB applications. (C) 2021 Elsevier Ltd. All rights reserved.
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