Binghang Liu, Jintao Ma, Jingnan Feng, Ting Lin, Liumin Suo
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引用次数: 0
摘要
固体电解质间相(SEI)在延长水电池寿命方面发挥着至关重要的作用。传统的水性电解质中阴离子衍生 SEI 的形成高度依赖于高浓度的有机氟化盐,导致形成效率低和长期消耗。为此,本研究提出了一种双功能碳氟化合物电极添加剂(BFEA),它可以代替 TFSI 阴离子进行电化学预还原,形成富含锂的 SEI,并在锂化之前在阳极内部原位生成导电石墨。BFEA 降低了水性电解质的盐依赖性,使无机氯化锂电解质首先发挥作用,而且还在相对较低的 10 m LiTFSI 中成功实现了较高的 SEI 形成效率,没有传质问题,将寄生氢演化从 11.24 nmol min-1 抑制到 4.35 nmol min-1。此外,BFEA 还能降低因原位生成石墨而导致的电池极化,促进电极动力学的电荷转移,从而增强锂存储反应的内在优越性。与对照组相比,采用 BFEA 的 Ah 级袋式电池在 300 次以上循环中表现出更好的循环稳定性,容量保持率高达 78.2%,往返效率衰减更低(△RTE = 2%),有利于在大规模电能存储中保持高效率并减少热量积累。
Bifunctional Fluorocarbon Electrode Additive Lowers the Salt Dependence of Aqueous Electrolytes
The solid electrolyte interphase (SEI) plays a crucial role in extending the life of aqueous batteries. The traditional anion-derived SEI formation in aqueous electrolytes highly depends on high-concentrated organic fluorinating salts, resulting in low forming efficiency and long-term consumption. In response, this study proposes a bifunctional fluorocarbon electrode additive (BFEA) that enables electrochemical pre-reduction instead of TFSI anion to form the LiF-rich SEI and in situ produce conductive graphite inside the anode before the lithiation. The BFEA lowers the salt dependence of aqueous electrolytes, enabling the inorganic LiCl electrolyte to work first, but also successfully achieves a high SEI formation efficiency in the relatively low 10 m LiTFSI without mass transfer concerns, suppressing the parasitic hydrogen evolution from 11.24 to 4.35 nmol min−1. Besides, BFEA strengthens the intrinsic superiority of Li storage reaction by lowering battery polarization resulting from the in situ production of graphite, promoting charge transfer of electrode kinetics. Compared with the control group, the demonstrated Ah-level pouch cell employing BFEA exhibits better cycle stability above 300 cycles with higher capacity retention of 78.2% and the lower decay of the round-trip efficiency (△RTE = 2%), benefiting for maintaining the high efficiency and reducing heat accumulation in large-scale electric energy storage.
期刊介绍:
Advanced Materials, one of the world's most prestigious journals and the foundation of the Advanced portfolio, is the home of choice for best-in-class materials science for more than 30 years. Following this fast-growing and interdisciplinary field, we are considering and publishing the most important discoveries on any and all materials from materials scientists, chemists, physicists, engineers as well as health and life scientists and bringing you the latest results and trends in modern materials-related research every week.