Thermal and electrochemical stability of organosilicon electrolytes for lithium-ion batteries
| Autor: | Xin Chen, Robert West, Robert J. Hamers, Monica L. Usrey, Adrián Peña-Hueso |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Renewable Energy
Sustainability and the Environment Inorganic chemistry Energy Engineering and Power Technology chemistry.chemical_element Trimethylsilane Electrolyte Electrochemistry Decomposition Lithium-ion battery chemistry.chemical_compound chemistry Lithium Thermal stability Electrical and Electronic Engineering Physical and Theoretical Chemistry Organosilicon |
| Zdroj: | Journal of Power Sources. 241:311-319 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2013.04.079 |
| Popis: | Organosilicon (OS) electrolytes that integrate an ethylene glycol oligomer with a trimethylsilane head group are promising substitutes for commercial carbonate-based electrolytes because of their low flammability and their high electrochemical and thermal stability. To explore the factors that control thermal and electrochemical stability of these compounds, we developed a real-time headspace analysis apparatus with a mass spectrometer to detect the evolution of decomposition products during thermal cycling and during electrochemical measurements. Here we present mass spectroscopy, XPS, and SEM results exploring the thermal stability of [2-[2-(2-Methoxyethoxy)ethoxy]ethoxy]trimethylsilane (1NM3) with LiPF6, and its electrochemical stability against graphite anodes and LiCoO2 cathodes. Our results show that 1NM3 + LiPF6 shows no significant decomposition below 100 °C and at potentials below 4.5 V. At higher temperatures and/or potentials, decomposition of LiPF6 induces hydrolysis of 1NM3. Our results show that LiPF6 decomposition is the limiting factor controlling stability of 1NM3 + LiPF6 electrolytes and also provide fundamental insights into the molecular bonds of 1NM3 that are attacked by PF5 and its decomposition products. Full-cell measurements of 1NM3 + LiPF6 + vinyl carbonate show Coulombic efficiencies of >99.6%. These results point the way to new molecular structures that may have even further enhanced electrochemical and thermal stability. |
| Databáze: | OpenAIRE |
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