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Surface Science and Electrochemical Model Studies on the Interaction of Graphite and Li‐Containing Ionic Liquids
Author(s) -
Weber Isabella,
Kim Jihyun,
Buchner Florian,
Schnaidt Johannes,
Behm R. Jürgen
Publication year - 2020
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202000495
Subject(s) - ionic liquid , x ray photoelectron spectroscopy , electrolyte , electrochemistry , pyrolytic carbon , graphite , highly oriented pyrolytic graphite , materials science , electrode , chemical engineering , carbon fibers , inorganic chemistry , chemistry , organic chemistry , catalysis , pyrolysis , composite number , engineering , composite material
The 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.