Probing Solid-Electrolyte Interphase (SEI) Growth and Ion Permeability at Undriven Electrolyte-Metal Interfaces Using 7Li NMR
Probing Solid-Electrolyte Interphase (SEI) Growth and Ion Permeability at Undriven Electrolyte-Metal Interfaces Using 7Li NMR
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DOI：
10.1021/acs.jpcc.8b01958
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发表时间：
2018-06-21
影响因子：
3.7
通讯作者：
Jerschow, Alexej
中科院分区：
文献类型：
--
作者：
Ilott, Andrew J.;Jerschow, Alexej
本文用Li-7核磁共振谱研究了电解质与金属锂之间的Li离子交换。测量量化的液体-固体交换过程，以及固体电解质界面（SEI）层的生长。一个数值模型，包括在固相中的扩散，通过原子跳跃，射频穿透的考虑，通过趋肤效应，以及表面交换解释了实验趋势。SEI层的生长的并入解释了“缺失的”Li量，并且随着SEI层的生长，对依赖于层厚度的降低的离子渗透性进行建模以解释长期趋势。这些测量为SEI生长和渗透性提供了间接探针，并且还提供了用于量化金属中Li扩散的手段。
We examine here the exchange of Li ions between electrolyte and metallic lithium with Li-7 NMR spectroscopy. The measurements quantify the liquid-solid exchange processes, as well as the growth of a solid-electrolyte interphase (SEI) layer. A numerical model including diffusion in the solid phase through atom hopping, radiofrequency penetration considerations through the skin effect, as well as surface exchange explains the experimental trends. Incorporation of the growth of an SEI layer explains the "missing" Li quantities, and, as the SEI layer grows, a decreased ion permeability in dependence on the layer thickness is modeled to explain the long-term trends. These measurements provide indirect probes for SEI growth and permeabilities and also provide a means for quantifying Li diffusion in the metal.