Identifying the Decomposition of Diethyl Carbonate in Binary Electrolyte Solutions in Contact with Silicon Anodes - A Sum Frequency Generation Vibrational Spectroscopy Study
| Autor: | Yonatan Horowitz, Hui-Ling Han, Gabor A. Somorjai |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Silicon 020209 energy General Chemical Engineering Analytical chemistry Diethyl carbonate chemistry.chemical_element Infrared spectroscopy 02 engineering and technology General Chemistry Electrolyte 021001 nanoscience & nanotechnology Industrial and Manufacturing Engineering Lithium ion transport chemistry.chemical_compound chemistry 0202 electrical engineering electronic engineering information engineering Lithium Crystalline silicon 0210 nano-technology Ethylene carbonate |
| Zdroj: | Industrial & Engineering Chemistry Research. 57:1480-1486 |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/acs.iecr.7b03774 |
| Popis: | The key factor in the use of lithium ion batteries is the formation of an electrically insulating solid layer that allows lithium ion transport but stops further electrolyte redox reactions on the electrode surface, therefore termed the solid electrolyte interphase (SEI). We have studied the preceding stages to the SEI formation, specifically the reduction of diethyl carbonate (DEC) mixed with ethylene carbonate (EC) with dissolved 1.0 M LiPF6, a common binary electrolyte. We used a p-doped crystalline silicon (100)-hydrogen terminated wafer as the anode in a lithium (Li) half-cell system. We employed in situ sum frequency generation (SFG) vibrational spectroscopy with interface sensitivity to probe the molecular composition of the SEI surface species under various applied potentials where only diethyl carbonate reduction to form a Si-ethoxy (Si-OCH2CH3) surface is expected. We found that even at open circuit potential (OCP) DEC decomposes on the silicon (100)-hydrogen surface to form Si-ethoxy bonds. The... |
| Databáze: | OpenAIRE |
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