Research group Prof. Dr. Jürgen Janek

Current notice: Are you interested in joining our group? You can find current vacancies in the job market of JLU Giessen (FB 08, Biologie und Chemie, Physikalisch-Chemisches Institut). You are also welcome to receive further information by e-mail.

Welcome to our homepage!: Die AG Janek erforscht physikalisch-chemische Grundlagen von Festkörperprozessen, die für moderne Energie- und Grenzflächentechnologien wichtig sind.

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

	BASF-Forschungsnetzwerk "Elektrochemie und Batterien"
	BMBF-Kompetenzcluster für Festkörperbatterien "FestBatt" Project ProLiFest (Refining and processing of lithium foils and electrodes for solid-state batteries)
	BMBF-Projekt ALISS "Aluminium-Ionen-Batterie für stationäre Speichersysteme"
	BMBF-Projekt ELONGATE "Liquid Electrolytes for Next-Generation Battery Systems: Study and Implications of Reactive Species Solubility and Diffusivity"
	BMBF-Projekt FLiPS "Feststoffbatterien mit Lithiummetall und Polymeren Schutzschichten"
	BMBF-Projekt MaLiBa "Maßgeschneiderte Lithium-Metall-Anoden für zukünftige Batteriesysteme"
	BMBF-Projekt MaLiBa "Maßgeschneiderte Lithium-Metall-Anoden für zukünftige Batteriesysteme"
	BMBF-Projekt MeLuBatt "Frischer Wind für Metall/Luftsauerstoff-Batterien: Was man von Lithium-Ionen-Batterien lernen kann"
	BMBF-Projekt NASEBER "Natriumbasierte feste Sulfid- und Oxid-Elektrolyt-Batterien"
	BMBF - Deutsch-Japanisches Programm Projekt "Osaban" (Operando surface analytics for batteries with 3D-structured metal anodes) Projekt "InCa" (Interfaces in Composite All-solid-state Cathodes: Advanced Characterization and Optimization; 3D analysis of structured composite cathodes)
	BMBF - Deutsch-Taiwanesisches Programm Projekt "AdamBatt"
	BMBF - Deutschland-USA (DE-US) Projekte "LiSi" und "CatSE"
	DFG-Exzellenzinitiative - Cluster "POLIS"
	German Israeli Battery School
	Kooperationsprojekt mit Volkswagen AG "Modellierung von Feststoffbatterien"