American Chemical Society
nl2c00616_si_004.mp4 (1.52 MB)

Enabling Ultrastable Alkali Metal Anodes by Artificial Solid Electrolyte Interphase Fluorination

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posted on 2022-05-18, 18:09 authored by Yifeng Cheng, Xuming Yang, Menghao Li, Xiangyan Li, Xinzhen Lu, Duojie Wu, Bing Han, Qing Zhang, Yuanmin Zhu, Meng Gu
The high specific capacity of alkalic metal (Li, Na, and K) anodes has drawn widespread interest; however, the practical applications of alkalic metal anodes have been hampered by dendrite growth and interfacial instability, resulting in performance deterioration and even safety issues. Here, we describe a simple method for building tunable fluoride-based artificial solid-electrolyte interphase (SEI) from the fluorination reaction of alkali metals with a mild organic fluorinating reagent. Comprehensive characterization by advanced electron microscopes shows that the LiF-based artificial SEI adopts a crystal–glass structure, which enables efficient Li ion transport and improves structural integrity against the volume changes that occur during Li plating/stripping. Compared with bare Li anode, the ones with artificial SEI exhibit decreased voltage hysteresis, enhanced rate capability, and prolonged cycle life. This method is also applied to generate fluoride-based artificial SEI on Na and K metal anodes that brings significant improvement in battery performance.