电解质
阳极
材料科学
钝化
硅
化学工程
电化学
石墨
锂(药物)
纳米技术
无机化学
电极
化学
复合材料
图层(电子)
冶金
物理化学
内分泌学
工程类
医学
作者
Yanli Yin,Elisabetta Arca,Luning Wang,Guang Yang,Manuel Schnabel,Lei Cao,Chuanxiao Xiao,Hongyao Zhou,Ping Liu,Jagjit Nanda,Glenn Teeter,Bryan W. Eichhorn,Kang Xu,Anthony K. Burrell,Chunmei Ban
标识
DOI:10.1021/acsami.0c03799
摘要
A stable solid electrolyte interphase (SEI) has been proven to be a key enabler to most advanced battery chemistries, where the reactivity between the electrolyte and the anode operating beyond the electrolyte stability limits must be kinetically suppressed by such SEIs. The graphite anode used in state-of-the-art Li-ion batteries presents the most representative SEI example. Because of similar operation potentials between graphite and silicon (Si), a similar passivation mechanism has been thought to apply on the Si anode when using the same carbonate-based electrolytes. In this work, we found that the chemical formation process of a proto-SEI on Si is closely entangled with incessant SEI decomposition, detachment, and reparation, which lead to continuous lithium consumption. Using a special galvanostatic protocol designed to observe the SEI formation prior to Si lithiation, we were able to deconvolute the electrochemical formation of such dynamic SEI from the morphology and mechanical complexities of Si and showed that a pristine Si anode could not be fully passivated in carbonate-based electrolytes.
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