Research group Prof. Dr. Jürgen Janek
- Welcome to our homepage!
- Recent Publications
On the Additive Microstructure in Composite Cathodes and Alumina-Coated Carbon Microwires for Improved All-Solid-State Batteries
S. Randau, F. Walther, A. Neumann, Y. Schneider, R. S. Negi, B. Mogwitz, J. Sann, K. Becker-Steinberger, T. Danner, S. Hein, A. Latz, F. H. Richter, and Jürgen Janek, Chem. Mater. 33 (2021) 1380; find paper here
Impedance Analysis of NCM Cathode Materials: Electronic and Ionic Partial Conductivities and the Influence of Microstructure
J. Zahnow, T. Bernges, A. Wagner, N. Bohn, J. R. Binder, W. G. Zeier, M. T. Elm, and J. Janek, ACS Appl. Energy Mater. 4 (2021) 1335; find paper here
In-Depth Characterization of Lithium-Metal Surfaces with XPS and ToF-SIMS: Toward Better Understanding of the Passivation Layer
S.-K. Otto, Y. Moryson, T. Krauskopf, K. Peppler, J. Sann, J. Janek, and A. Henss, Chem. Mater 33 (2021) 859; find paper here
Linking Solid Electrolyte Degradation to Charge Carrier Transport in the Thiophosphate‐Based Composite Cathode toward Solid‐State Lithium‐Sulfur Batteries
S. Ohno, C. Rosenbach, G. F. Dewald, J. Janek, and W. G. Zeier, Adv. Funct. Mater (2021) 2010620; find paper here
Analysis of Charge Carrier Transport Toward Optimized Cathode Composites for All‐Solid‐State Li−S Batteries
G. F. Dewald, S. Ohno, J. G. C. Hering, J. Janek, and W. G. Zeier, Batteries Supercaps 3 (2020); find paper here
Lithium‐Metal Anode Instability of the Superionic Halide Solid Electrolytes and the Implications for Solid‐State Batteries
L. Riegger, R. Schlem, J. Sann, W. G. Zeier, and J. Janek, Angew. Chem. Int. Ed. 60 (2021) 6718; find paper here
- Picture of the month - August 2019
Here you can find alternating insights into our research group. Enlarged versions of all published pictures can be found here.
In-Depth Characterization of Lithium Metal Surfaces
The use of lithium metal as anode is an intensively explored option to significantly increase the energy density of batteries. As lithium is highly reactive, its surface is natively covered with a passivation layer that affects the cell performance. However, the passivation layer is mostly not considered and characterized. Therefore, we systematically characterized various lithium samples with X-ray photoelectron spectroscopy (XPS), time-of-flight secondary ion mass spectrometry (ToF-SIMS) and complementary energy-dispersive X-ray spectroscopy (EDX), to give a complete three-dimensional chemical picture of the surface passivation layer. Besides, we explored the factors influencing the passivation layer and the experimental design which is needed to reliably characterize a highly reactive analyte like lithium. (Picture submitted by Svenja Otto).
- The WG Janek is involved in the following networks