Regensburg 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 67: Poster Wednesday: Solid-Liquid Interfaces
O 67.7: Poster
Mittwoch, 3. April 2019, 17:45–20:00, Poster B2
Impact of the Electrolyte Salt Anion on the Solid Electrolyte Interphase (SEI) Formation at the Hard Carbon Electrodes of Sodium Ion Batteries — Gebrekidan Gebresilassie Eshetu1,2,3, •Thomas Diemant4, Maral Hekmatfar1,2, Sylvie Grugeon5, R. Jürgen Behm1,4, Stéphane Laruelle5, Michel Armand3, and Stefano Passerini1,2 — 1Helmholtz Institute Ulm (HIU), Helmholtzstr. 11, D-89081 Ulm, Germany — 2Karlsruhe Institute of Technology (KIT), P.O. Box 3640, D-76021 Karlsruhe, Germany — 3CIC EnergiGUNE, Parque Tecnológico de Álava, Albert Einstein 48, E-01510 Miñano, Spain — 4Institute of Surface Chemistry and Catalysis, Ulm University, Albert-Einstein-Allee 47, D-89081 Ulm, Germany — 5Laboratoire de Réactivité et Chimie des Solides (LRCS) CNRS UMR 7314, Réseau Français sur le Stockage Électrochimique de l’Énergie (RS2E) FR CNRS 3459, F-80039 Amiens, France
Aiming at a more comprehensive understanding of the solid electrolyte interphase (SEI) in sodium ion batteries, we performed a detailed X-ray photoelectron spectroscopic (XPS) investigation of the few-nanometer thick passivation film formed on hard carbon (HC) in contact with various Na-ion conducting electrolytes (1M solutions of NaPF6, NaClO4, NaTFSI, NaFSI, or NaFTFSI in a 1/1 mixture of diethylcarbonate/ethylcarbonate). For comparison, analogous studies were carried out using LiPF6 and LiFSI as electrolyte salt. Taken together, the anion and cation of the electrolyte salt appear to play a key role for the overall SEI layer composition, including its depth evolution and thickness.