Surface Science and Electrochemical Model Studies on the Interaction of Graphite and Li‐Containing Ionic Liquids
| Autor: | R. Juergen Behm, Isabella Weber, Johannes Schnaidt, Jihyun Kim, Florian Buchner |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
DDC 540 / Chemistry & allied sciences
Technology Materials science General Chemical Engineering Elektrochemie Ionic bonding 02 engineering and technology 010402 general chemistry Electrochemistry 01 natural sciences Karbon chemistry.chemical_compound X-ray photoelectron spectroscopy Highly oriented pyrolytic graphite Very Important Paper Environmental Chemistry General Materials Science Graphite Chemical decomposition ionic liquid Oberflächenchemie Full Paper Full Papers 021001 nanoscience & nanotechnology solid–electrolyte interphase Surface chemistry Carbon 0104 chemical sciences General Energy chemistry Chemical engineering ddc:540 Electrode Ionic liquid 0210 nano-technology ddc:600 |
| Zdroj: | ChemSusChem, 13 (10), 2589-2601 Chemsuschem |
| ISSN: | 1864-564X 1864-5631 |
| DOI: | 10.1002/cssc.202000495 |
| Popis: | nterphase formation during Li post-deposition on multilayers of the ionic liquid (IL) 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ([BMP][TFSI]) on highly oriented pyrolytic graphite is studied under vacuum and during electrochemical cycling of graphite electrodes in Li+-containing [BMP][TFSI] by using X-ray photoelectron spectroscopy. [BMP]+ decomposition occurs preferentially during Li0-induced IL decomposition, whereas electrochemical cycling leads to [TFSI]− reduction. he process of solid–electrolyte interphase (SEI) formation is systematically investigated along with its chemical composition on carbon electrodes in an ionic liquid-based, Li-containing electrolyte in a combined surface science and electrochemical model study using highly oriented pyrolytic graphite (HOPG) and binder-free graphite powder electrodes (Mage) as model systems. The chemical decomposition process is explored by deposition of Li on a pre-deposited multilayer film of 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ([BMP][TFSI]) under ultrahigh vacuum conditions. Electrochemical SEI formation is induced by and monitored during potential cycling in [BMP][TFSI]+0.1 m LiTFSI. The chemical composition of the resulting layers is characterized by X-ray photoelectron spectroscopy (XPS), both at the surface and in deeper layers, closer to the electrode|SEI interface, after partial removal of the film by Ar+ ion sputtering. Clear differences between chemical and electrochemical SEI formation, and also between SEI formation on HOPG and Mage electrodes, are observed and discussed. publishedVersion |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text