RT info:eu-repo/semantics/article
T1 Solid Electrolyte Interphase (SEI) at TiO2 Electrodes in Li-Ion Batteries: Defining Apparent and Effective SEI Based on Evidence from X-ray Photoemission Spectroscopy and Scanning Electrochemical Microscopy
A1 Ventosa Arbaizar, Edgar
A1 Madej, Edyta
A1 Zampardi, Giorgia
A1 Mei, Bastian
A1 Weide, Philipp
A1 Antoni, Hendrik
A1 La Mantia, Fabio
A1 Muhler, Martin
A1 Schuhmann, Wolfgang
K1 Li-on batteries
K1 Solid electrolyte interphase
K1 X-ray photoemission
K1 Scanning electrochemical microscopy
K1 Titanium dioxide
K1 Química
K1 Chemistry
K1 Química analítica
K1 Chemistry, Analytic
AB The high (de)lithiation potential of TiO2 (ca. 1.7 V vs Li/Li+ in 1 M Li+) decreases the voltage and, thus, the energy density of a corresponding Li-ion battery. On the other hand, it offers several advantages such as the (de)lithiation potential far from lithium deposition or absence of a solid electrolyte interphase (SEI). The latter is currently under controversial debate as several studies reported the presence of a SEI when operating TiO2 electrodes at potentials above 1.0 V vs Li/Li+. We investigate the formation of a SEI at anatase TiO2 electrodes by means of X-ray photoemission spectroscopy (XPS) and scanning electrochemical microscopy (SECM). The investigations were performed in different potential ranges, namely, during storage (without external polarization), between 3.0–2.0 V and 3.0–1.0 V vs Li/Li+, respectively. No SEI is formed when a completely dried and residues-free TiO2 electrode is cycled between 3.0 and 2.0 V vs Li/Li+. A SEI is detected by XPS in the case of samples stored for 6 weeks or cycled between 3.0 and 1.0 V vs Li/Li+. With use of SECM, it is verified that this SEI does not possess the electrically insulating character as expected for a “classic” SEI. Therefore, we propose the term apparent SEI for TiO2 electrodes to differentiate it from the protecting and effective SEI formed at graphite electrodes.
PB American Chemical Society
SN 1944-8244
YR 2016
FD 2016-12
LK https://hdl.handle.net/10259/11377
UL https://hdl.handle.net/10259/11377
LA eng
NO Financial support from the DFG (Deutsche Forschungsgemeinschaft) in the framework of the Cluster of Excellence RESOLV (EXC1069) is gratefully acknowledged.
DS Repositorio Institucional de la Universidad de Burgos
RD 17-abr-2026