Aqueous multi-electron electrolyte for hybrid flow batteries with high energy and power densities

IF 5.4 Q2 CHEMISTRY, PHYSICAL
Qiuhong Wang, Walid A. Daoud
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引用次数: 4

Abstract

Flow battery is a promising energy storage technology for facilitating utilization of renewable resources. While new types of flow batteries have been explored toward high energy density, hampering the power density due to high electrolyte viscosity and sluggish reaction kinetics. Discovery of an aqueous electrolyte with multi-electron transfer reaction is thus favorable for both high energy and power densities due to its multiple charge stored at the same concentration. Both criteria are crucial to improve the flexibility of cell design and widen the application potential. Herein, bismuth is pioneered as negative electrolyte (negolyte) for hybrid flow battery owing to its three-electron reaction and the significantly increased solubility in methanesulfonic acid. In conjunction with cerium electrolyte, a volumetric energy density of 90 Wh L−1 is achieved and simultaneously a high power density of 295 mW cm−2 at 90% state-of-charge is demonstrated using low-cost carbon electrode. Furthermore, a high volumetric capacity of 120 Ah L−1 is reached via adopting graphite felt, which is 100% of the theoretical specific capacity of 1.5 M bismuth negolyte.

用于高能量和功率密度混合液流电池的多电子水溶液
液流电池是一种很有前途的储能技术,可以促进可再生资源的利用。虽然新型液流电池正朝着高能量密度方向发展,但由于电解质粘度高,反应动力学缓慢,阻碍了功率密度的提高。具有多电子转移反应的水电解质的发现,由于其在相同浓度下存储了多个电荷,因此有利于高能量和功率密度。这两个标准对于提高电池设计的灵活性和扩大应用潜力至关重要。其中,铋因其三电子反应和在甲磺酸中的溶解度显著提高而被率先用作混合液流电池的负电解质(negolyte)。与铈电解质相结合,实现了90 Wh L−1的体积能量密度,同时证明了使用低成本碳电极在90%充电状态下的高功率密度为295 mW cm−2。此外,采用石墨毡可获得120 Ah L−1的高容量,是1.5 M无晶铋理论比容量的100%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
9.10
自引率
0.00%
发文量
18
审稿时长
64 days
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