Solid Electrolyte Interphase on Native Oxide-Terminated Silicon Anodes for Li-Ion Batteries
| Autor: | Thomas P. Devereaux, Eric Sivonxay, Brian Moritz, Iwnetim Abate, Badri Shyam, Kristin A. Persson, Hans-Georg Steinrück, Chuntian Cao, Chunjing Jia, Michael F. Toney |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Silicon Oxide chemistry.chemical_element 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Lithium-ion battery 0104 chemical sciences chemistry.chemical_compound General Energy X-ray photoelectron spectroscopy chemistry Chemical engineering Linear sweep voltammetry Wafer 0210 nano-technology Layer (electronics) |
| Zdroj: | Joule. 3:762-781 |
| ISSN: | 2542-4351 |
| DOI: | 10.1016/j.joule.2018.12.013 |
| Popis: | Summary To shed light on the formation process and structure of the solid electrolyte interphase (SEI) layer on native oxide-terminated silicon wafer anodes from a carbonate-based electrolyte (LP30), we combined in situ synchrotron X-ray reflectivity, linear sweep voltammetry, ex situ X-ray photoelectron spectroscopy, and first principles calculations from the Materials Project. We present in situ sub-nanometer resolution structural insights and compositional information of the SEI, as well as predicted equilibrium phase stability. Combining these findings, we observe two well-defined inorganic SEI layers next to the Si anode—a bottom-SEI layer (adjacent to the electrode) formed via the lithiation of the native oxide, and a top-SEI layer mainly consisting of the electrolyte decomposition product LiF. Our study provides novel mechanistic insights into the SEI growth process on Si, and we discuss several important implications regarding ion and electron transport through the SEI layer. |
| Databáze: | OpenAIRE |
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