溴
胆碱
铵
锌
冰点
无机化学
离子
材料科学
化学
化学工程
有机化学
热力学
生物化学
物理
工程类
作者
Ming Zhao,Tao Cheng,Tianyu Li,Ran Bi,Yanbin Yin,Xianfeng Li
出处
期刊:Small
[Wiley]
日期:2023-12-08
卷期号:20 (16): e2307627-e2307627
被引量:15
标识
DOI:10.1002/smll.202307627
摘要
The high freezing point of polybromides, charging products, is a significant obstacle to the rapid development of zinc-bromine flow batteries (Zn-Br2 FBs). Here, a choline-based complexing agent (CCA) is constructed to liquefy the polybromides at low temperatures. Depending on quaternary ammonium group, choline can effectively complex with polybromide anions and form dense oil-phase that has excellent antifreezing property. Benefiting from indispensable strong ion-ion interaction, the highly selectively compatible CCA, consisting of choline and N-methyl-N-ethyl-morpholinium salts (CCA-M), can be achieved to further enhance bromine fixing ability. Interestingly, the formed polybromides with CCA-M are able to keep liquid even at -40 °C. The CCA-M endows Zn-Br2 FBs at 40 mA cm-2 with unprecedented long cycle life (over 150 cycles) and high Coulombic efficiency (CE, average ≈98.8%) at -20 °C, but also at room temperature (over 1200 cycles, average CE: ≈94.7%). The CCA shows a promising prospect of application and should be extended to other antifreezing bromine-based energy storage systems.
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