التفاصيل البيبلوغرافية
| العنوان: |
An In-Situ Raman Spectroscopic Study on the Interfacial Process of Carbonate-Based Electrolyte on Nanostructured Silver Electrode. |
| Alternate Title: |
碳酸酯类电解液中纳米银电极界面过程的原位拉曼光谱研究. (Chinese) |
| المؤلفون: |
Yu Gu, Yuan-Fei Hu, Wei-Wei Wang, En-Ming You, Shuai Tang, Jian-Jia Su, Jun Yi, Jia-Wei Yan, Zhong-Qun Tian, Bing-Wei Mao |
| المصدر: |
Journal of Electrochemistry; 2023, Vol. 29 Issue 12, p1-10, 10p |
| مصطلحات موضوعية: |
CARBONATES, ELECTRODES, RAMAN spectroscopy, LITHIUM cells, ANODES |
| Abstract (English): |
The solid-electrolyte interphase (SEI) plays a key role in anodes for rechargeable lithium-based battery technologies. However, a thorough understanding in the mechanisms of SEI formation and evolution remains a major challenge, hindering the rapid development and wide applications of Li-based batteries. Here, we devise a borrowing surface-enhanced Raman scattering (SERS) activity strategy by utilizing a size optimized Ag nanosubstrate to in-situ monitor the formation and evolution of SEI, as well as its structure and chemistry in an ethylene carbonate-based electrolyte. To ensure a reliable in-situ SERS investigation, we designed a strict air-tight Raman cell with a three-electrode configuration. Based on the potential-dependent spectroscopic information, we revealed that the SEI formed in an EC-based electrolyte presents a double-layer structure, comprising a thin inorganic inner layer and an organic-rich outer layer. We also identified that LEMC, rather than LEDC, is the major component of EC reduction, and the critical role of metallic Li in the formation of stable SEI is preliminary explored. Nevertheless, identifying the SEI compositions is only feasible before Li deposition on the Ag surface. After the formation of Li-Ag alloys, the subsequent evolution of SEI could not be detected due to the change in the dielectric constant of Ag after the lithiation. Our work provides a real-time spectroscopic method for investigating interfacial processes of anodes, which is beneficial to the understanding of SEI formation and evolution and thus provides guidance for the development of rationally designed SEI in Li-based batteries. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
锂电池体系中负极表面固态电解质界面相 (SEI)对锂电池性能起到至关重要的作用。然而SEI 结构和化学组成复杂其形成机理至今仍未完全阐明阻碍了锂电池的发展和应用。本文从方法学 角度出发采用表面增强拉曼光谱(SERS)“借力”策略通过优化银纳米粒子的结构并借助其外来 表面局域等离激元共振作用开展以EC-DMC 为溶剂的碳酸酯类电解液体系中SEI 成膜过程的原位 研究。为了确保可靠的原位 SERS 测试我们设计了一种三电极体系气密拉曼电池。我们利用原位 SERS 方法在纳米银电极上获得了SEI 成膜过程的组成和结构信息。研究表明SEI随电位变化呈 现出双层结构其中内层由薄且致密的无机组分构成外层由疏松的有机组分构成。同时研究发 现LEMC是EC还原的主要成分而不是LEDC且金属锂参与的化学反应在形成稳定 SEI 中的起 到关键作用。此外锂发生沉积后由于锂与银的合金效应导致其介电常数发生变化从而削无法进一 步增强 SEI 的拉曼信号。本文为深入理解负极表面SEI 的形成及演变过程提供依据并为今后开展锂电 池体系相关界面过程的原位研究提供借鉴。 [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
