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Cross-Talk–Suppressing Electrolyte Additive for Li-ion Batteries
Control of interfacial reactivity at high-voltage is a key to high-energy-density Li-ion batteries. 2-aminoethyldiphenyl borate was investigated as an electrolyte additive to stabilize surface and bulk of both NCM851005 and graphite in the cell with upper cut-off voltage of 4.4 V vs Li+/Li. AEDB almost completely eliminated the “cross-talk” in the cell, by significantly reducing metal leaching from the cathode, preventing their deposition at the anode, and further electrolyte decomposition.
Deciphering the Mechanism of FEC-induced SEI Formation in Li-ion Batteries
Fluoroethylene-carbonate is often referred to as a film-forming electrolyte additive for Li-ion batteries, resulting in high quality Solid–Electrolyte-Interphase on negative electrode, however, the underlying mechanism, even if thought to be known, has been only clarified due to our targeted experimental design, combining systematic electrochemical, chemical and microscopy characterization techniques. We have shown that first the formation of inorganic LiF-rich particles appear and only later the carbonate-rich film is actually formed.
Improving the oxygen evolution reaction activity of Co-based oxides by phosphate functionalization
Our findings disclose that P-functionalization successfully enhances the oxygen evolution reaction (OER) activity of different cobalt-based catalysts (namely, La0.2Sr0.8CoO3–δ, La0.2Sr0.8Co0.8Fe0.2O3–δ, and CoOx) at near-neutral pHs and that both phosphate ion assistance in the OER mechanism and catalyst Co oxidation state can play a role in the enhanced OER activity.
Past Publications
Thin Films and Interfaces
Publications
The publications of our group can also be found at the LCS laboratory. The publications of the individual beamlines are available here SIM and XTREME.
Scientist
Microscopy and Magnetism Group
ENE Seminar: New perception of the electrode/electrolyte interface in Li-ion battery enabled by XPEEM spectromicroscopy
Moderator: P. Novak, M. El Kazzi
ENE Seminar: Tenure Track II Presentation: 5 years of electrolytes/electrodes interface investigation in Li-ion batteries using photoelectron spectroscopy
Moderator: Prof. Dr. P. Novak
ENE Seminar: Recent progresses to gain better insight into the electrolytes-electrodes interface in Li-ion batteries
Moderator: Dr. Felix Büchi
Battery Electrodes and Cells
The primary goal is the development of a safe, environmentally benign, and cost effective electrochemical energy storage system with significantly improved specific energy. The research work focuses equally on the scientific background essential for the development of new technologies and on the analysis of ageing and safety relevant aspects of current industrial batteries. The investigated systems include both lithium-ion and post-lithium-ion batteries.