XPS and SIMS Analysis of Solid Electrolyte Interphases on Lithium Formed by Ether-Based Electrolytes
XPS and SIMS Analysis of Solid Electrolyte Interphases on Lithium Formed by Ether-Based Electrolytes
复制标题
DOI：
10.1149/2.0851714jes
复制
发表时间：
2017-01-01
影响因子：
3.9
通讯作者：
Janek, Juergen
中科院分区：
文献类型：
--
作者：
Fiedler, Carsten;Luerssen, Bjoern;Janek, Juergen
使用 X 射线光电子能谱 (XPS)、飞行时间二次离子质谱 (ToF-SIMS) 和扫描电子显微镜 (SEM) 研究了醚基电解质中锂金属上的固体电解质中间相 (SEI) 的化学成分和微观结构。基于 1,2-二甲氧基乙烷 (DME) 和 1,3-二氧戊环 (DOL) 溶剂以及双（三氟甲烷）磺酰胺锂 (LiTFSI) 导电盐的电解质可用于在不同的时间内钝化锂表面。进行两种类型的模型实验（浸入式和恒电流负载）以产生自感应和电流感应SEI。预测 SEI 成分的参考测量和先进的 XPS 信号耦合方法有助于光谱和光谱数据的解卷积。对于每个实验设置，两种醚溶剂均显示出特定的 SEI 形成。 DME 似乎会在锂表面立即分解，并在锂-醇盐骨架中形成各种盐的钝化膜。 DOL 显示有机盐和无机盐缓慢形成 SEI，揭示了锂表面保护的问题。在电流负载下，DME 中的反应速率增加，同时保持三维微观结构。对于 DOL，电流负载产生包含 LiTFSI 和氟化锂的有机主体材料的多层结构。最后，开发了 SEI 微观结构的二维示意图。 (c) 2017 年电化学协会。版权所有。
The chemical composition and microstructure of the solid electrolyte interphase (SEI) on lithium metal in ether-based electrolytes are investigated using X-ray photoelectron spectroscopy (XPS), time of flight secondary ion mass spectrometry (ToF-SIMS) and scanning electron microscopy (SEM). Electrolytes based on 1,2-dimethoxyethane (DME) and 1,3-dioxolane (DOL) solvents with lithium bis(trifluoromethane) sulfonamide (LiTFSI) conducting salt are employed to passivate lithium surfaces for different periods of time. Two types of model experiments (immersion-type and galvanostatic current load) are performed to generate self-and current-induced SEIs. Reference measurements of predicted SEI components and an advanced XPS signal coupling method facilitate the deconvolution of the spectroscopic and spectrometric data. Both ether solvents showed specific SEI formation for each experimental setup. DME appears to decompose immediately on the lithium surface and forms a thin passivation film of various salts in a lithium-alkoxide framework. DOL shows a slow SEI formation of organic and inorganic salts revealing problems in the lithium surface protection. Under current load the reaction rate is increased in DME maintaining the three-dimensional microstructure. For DOL the current load leads to a multi-layer structure of organic host materials comprising LiTFSI and lithium fluoride. Finally, two-dimensional schematic pictures of the SEI microstructure are developed. (c) 2017 The Electrochemical Society. All rights reserved.