Fluoroethylene Carbonate Induces Ordered Electrolyte Interface on Silicon and Sapphire Surfaces as Revealed by Sum Frequency Generation Vibrational Spectroscopy and X-ray Reflectivity
| Autor: | Yuchi Tsao, Iwnetim Abate, Chuntian Cao, Hui-Ling Han, Michael F. Toney, Hans-Georg Steinrück, Gabor A. Somorjai, Yonatan Horowitz |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Silicon Mechanical Engineering Analytical chemistry chemistry.chemical_element Bioengineering 02 engineering and technology General Chemistry Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Lithium perchlorate 0104 chemical sciences Anode X-ray reflectivity chemistry.chemical_compound chemistry Monolayer General Materials Science Lithium 0210 nano-technology Ethylene carbonate |
| Zdroj: | Nano letters. 18(3) |
| ISSN: | 1530-6992 |
| Popis: | The cyclability of silicon anodes in lithium ion batteries (LIBs) is affected by the reduction of the electrolyte on the anode surface to produce a coating layer termed the solid electrolyte interphase (SEI). One of the key steps for a major improvement of LIBs is unraveling the SEI’s structure-related diffusion properties as charge and discharge rates of LIBs are diffusion-limited. To this end, we have combined two surface sensitive techniques, sum frequency generation (SFG) vibrational spectroscopy, and X-ray reflectivity (XRR), to explore the first monolayer and to probe the first several layers of electrolyte, respectively, for solutions consisting of 1 M lithium perchlorate (LiClO4) salt dissolved in ethylene carbonate (EC) or fluoroethylene carbonate (FEC) and their mixtures (EC/FEC 7:3 and 1:1 wt %) on silicon and sapphire surfaces. Our results suggest that the addition of FEC to EC solution causes the first monolayer to rearrange itself more perpendicular to the anode surface, while subsequent lay... |
| Databáze: | OpenAIRE |
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