Operando Monitoring of F– Formation in Lithium Ion Batteries
| Autor: | Manuel A. Méndez, Aurélie Guéguen, Erik J. Berg, Christoph Bolli |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
General Chemical Engineering Gas evolution reaction Inorganic chemistry chemistry.chemical_element 02 engineering and technology General Chemistry Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Cathode Lithium-ion battery 0104 chemical sciences Anode law.invention chemistry law Materials Chemistry Reactivity (chemistry) Lithium 0210 nano-technology |
| Zdroj: | Chemistry of Materials. 31:1258-1267 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/acs.chemmater.8b03810 |
| Popis: | Online electrochemical mass spectrometry (OEMS) was applied to study the influence of tris(trimethylsilyl)phosphate (TMSPa) as an additive in 1 M LiPF6 (fluoroethylene carbonate/diethylene carbonate (DEC)) electrolyte on the gas evolution in Li-rich/NCM full cells during cycling. The results indicate that TMSPa neither influences the solid electrolyte interphase (SEI) formation on the anode nor the surface reconstruction on the cathode but acts as a chemical scavenger for HF and LiF. TMSPa thus lowers the electrolyte acidity and suppresses further LiPF6 decomposition, resulting in lower impedance and higher lithium ion battery (LIB) performance. Furthermore, the selective reactivity of TMSPa toward fluorides leads to the formation of Me3SiF enabling the additive to act as a chemical probe and to study HF/LiF formation operando by OEMS. By this methodology, we were able to identify contributions from SEI formation, proton and reactive oxygen formation >4.2 V, cross-talk between the anode and cathode, and t... |
| Databáze: | OpenAIRE |
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