Desymmetrization of Viologen Anolytes Empowering Energy Dense, Ultra Stable Flow Batteries toward Long‐Duration Energy Storage
Desymmetrization of Viologen Anolytes Empowering Energy Dense, Ultra Stable Flow Batteries toward Long‐Duration Energy Storage
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DOI：
10.1002/aenm.202202085
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发表时间：
2022-09
影响因子：
27.8
通讯作者：
Maowei Hu;Wenda Wu;Jian Luo;T. L. Liu
中科院分区：
文献类型：
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作者：
Maowei Hu;Wenda Wu;Jian Luo;T. L. Liu
水性有机氧化还原液流电池（AORFB）已经被认为是用于可再生能源（例如，太阳能和风能）通过克服它们的不稳定性和波动。然而，同时演示高能量密度和稳定的循环仍然具有挑战性的AORFBs。在本文中，提出了不对称取代的磺酸盐紫精分子设计，例如（1-[3-磺酸基丙基]-1 ′-[4-磺酸基丁烷]-4，4 ′-联吡啶鎓（3，4-S2 V），作为用于阳离子交换AORFB的容量密集、化学稳定的阳极电解液。在pH中性条件下，使用半电池和全电池液流电池研究证实了3，4-S2 V的稳健循环性能。基于3，4-S2 V的AORFB在1700次循环或100天的放电容量为23.2 Ah L−1，没有观察到化学降解。此外，具有259.9 mAh的放电容量的3，4-S2 V/（NH 4）4[Fe（CN）6] AORFB首次被证明用于50天的真实能量存储，总容量保持率为97.77%或时间容量留存率为99.955%/天，代表迄今为止最稳定、最长循环的AORFB。
Aqueous organic redox flow batteries (AORFBs) have been recognized as a promising technology for large‐scale, long‐duration energy storage of renewables (e.g., solar and wind) by overcoming their intermittence and fluctuation. However, simultaneous demonstration of high energy densities and stable cycling are still challenging for AORFBs. Herein, asymmetrically substituted sulfonate viologen molecular designs, e.g. (1‐[3‐sulfonatopropyl]‐1′‐[4‐sulfonatobutane]‐4,4′‐bipyridinium (3,4‐S2V), as capacity dense, chemically stable anolytes for cation exchange AORFBs are presented. The robust cycling performance of 3,4‐S2V is confirmed using half‐cell and full‐cell flow battery studies at pH neutral conditions. The 3,4‐S2V based AORFB is demonstrated with a discharge capacity of 23.2 Ah L−1 for 1700 cycles or 100 days without observing chemical degradation. Furthermore, a 3,4‐S2V/(NH4)4[Fe(CN)6] AORFB with a discharge capacity of 259.9 mAh is demonstrated for 50 days of authentic energy storage for the first time with a total capacity retention of 97.77% or a temporal capacity retention rate of 99.955% per day, representing the most stable, longest cycled AORFB to date.