Burak Aktekin, Elmar Kataev, Luise M. Riegger, Raul Garcia-Diez, Zora Chalkley, Juri Becker, Regan G. Wilks, Anja Henss, Marcus Bär, Jürgen Janek
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引用次数: 0
摘要
了解电解质分解反应是在什么电位下开始的以及随后形成的分解膜(如固体电解质间相(SEI))中存在哪些化学物种至关重要。本文介绍了一种新的操作性实验方法,即利用硬 X 射线光电子能谱 (HAXPES) 来研究此类反应。通过这种方法,可以对硫化锂 6PS5Cl 固体电解质电化学电池中作为工作电极的金属薄膜(例如 6 纳米镍)下方形成的 SEI 进行检测。电解质还原反应在 1.75 V 时已经开始(相对于 Li+/Li),并导致大量 Li2S 的形成,尤其是在 1.5-1.0 V 的电压范围内。在 SEI 中观察到了异质/分层的微观结构(例如,Li2O 和 Li2S 在集流器附近优先沉积)。此外,还观察到副反应的可逆性,Li2O 和 Li2S 在 2-4 V 电位窗口中分解,生成氧化硫、亚硫酸盐和硫酸盐。
Operando Photoelectron Spectroscopy Analysis of Li6PS5Cl Electrochemical Decomposition Reactions in Solid-State Batteries
It is crucial to understand at which potentials electrolyte decomposition reactions start and which chemical species are present in the subsequently formed decomposition films, e.g., solid electrolyte interphase (SEI). Herein, a new operando experimental approach is introduced to investigate such reactions by employing hard X-ray photoelectron spectroscopy (HAXPES). This approach enables the examination of the SEI formed below a thin metal film (e.g., 6 nm nickel) acting as the working electrode in an electrochemical cell with sulfide-based Li6PS5Cl solid electrolyte. Electrolyte reduction reactions already started at 1.75 V (vs Li+/Li) and resulted in considerable Li2S formation, particularly in the voltage range 1.5–1.0 V. A heterogeneous/layered microstructure of the SEI is observed (e.g., preferential Li2O and Li2S deposits near the current collector). The reversibility of side reactions is also observed, as Li2O and Li2S decompose in the 2–4 V potential window, generating oxidized sulfur species, sulfites, and sulfates.
ACS Energy Letters Energy-Renewable Energy, Sustainability and the Environment
CiteScore
31.20
自引率
5.00%
发文量
469
审稿时长
1 months
期刊介绍:
ACS Energy Letters is a monthly journal that publishes papers reporting new scientific advances in energy research. The journal focuses on topics that are of interest to scientists working in the fundamental and applied sciences. Rapid publication is a central criterion for acceptance, and the journal is known for its quick publication times, with an average of 4-6 weeks from submission to web publication in As Soon As Publishable format.
ACS Energy Letters is ranked as the number one journal in the Web of Science Electrochemistry category. It also ranks within the top 10 journals for Physical Chemistry, Energy & Fuels, and Nanoscience & Nanotechnology.
The journal offers several types of articles, including Letters, Energy Express, Perspectives, Reviews, Editorials, Viewpoints and Energy Focus. Additionally, authors have the option to submit videos that summarize or support the information presented in a Perspective or Review article, which can be highlighted on the journal's website. ACS Energy Letters is abstracted and indexed in Chemical Abstracts Service/SciFinder, EBSCO-summon, PubMed, Web of Science, Scopus and Portico.