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Research group Prof. Dr. Jürgen Janek

Physical chemistry of solids – solid state ionics and electrochemistry
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!
AG Janek 2018

 

Die AG Janek erforscht physikalisch-chemische Grundlagen von Festkörperprozessen, die für moderne Energie- und Grenzflächentechnologien wichtig sind.

Recent Publications

A Quasi-Multinary Composite Coating on a Nickel-Rich NCM Cathode Material for All-Solid-State Batteries
D. Kitsche, F. Strauss, Y. Tang, N. Bartnick, A.‐Y. Kim, Y. Ma, C. Kübel, J. Janek, T. Brezesinski, Batter. Supercaps (2022) e202100397; find paper here

 

In Situ Investigation of Lithium Metal–Solid Electrolyte Anode Interfaces with ToF‐SIMS
S.‐K. Otto, L. M. Riegger, T. Fuchs, S. Kayser, P. Schweitzer, S. Burkhardt, A. Henss, and J. Janek, Adv. Mater. Interfaces. (2022) 210387; find paper here

 

Influence of Lithium Ion Kinetics, Particle Morphology and Voids on the Electrochemical Performance of Composite Cathodes for All-Solid-State Batteries
A. Bielefeld, D. A. Weber, R. Ruess, V. Glavas, and J. Janek, J. Electrochem. Soc. (2022); find paper here

 

Defect Chemistry of Individual Grains with and without Grain Boundaries of Al-Doped Ceria Determined Using Well-Defined Microelectrodes
J. Zahnow, M. Bastianello, J. Janek, and M. T. Elm, J. Phys. Chem. C (2022); find paper here

 

A mechanistic investigation of the Li10GeP2S12|LiNi1-x-yCoxMnyO2 interface stability in all-solid-state lithium batteries
T.-T. Zuo, R. Rueß, R. Pan, F. Walther, M. Rohnke, S. Hori, R. Kanno, D. Schröder, and J. Janek, Nat. Commun. 12 (2021) 6669; find paper here

 

Multi-Element Surface Coating of Layered Ni-Rich Oxide Cathode Materials and Their Long-Term Cycling Performance in Lithium-Ion Batteries
S. L. Dreyer, K. R. Kretschmer, Đ. Tripković, A. Mazilkin, R. Chukwu, R. Azmi, P. Hartmann, M. Bianchini, T. Brezesinski, and J. Janek, Adv. Mater. Interfaces (2021) 2101100; find paper here
Picture of the month - March 2021

Here you can find alternating insights into our research group. Enlarged versions of all published pictures can be found here.

Solid-state batteries have been researched and characterized with greater intensity in recent years due to their better properties compared to lithium-ion batteries, such as higher safety or broader operating temperature and comparable ionic conductivities. To compensate for the higher density of solid electrolytes, using lithium metal as anode material is necessary to obtain good gravimetric and volumetric energy densities. However, lithium metal is very reactive. If electronically conductive products are formed during the reaction of the solid electrolyte with lithium, this electrolyte cannot be in direct contact with lithium, otherwise short circuits may occur. In order to investigate the reaction products of the halide solid electrolyte Li3InCl6 with lithium, lithium is applied to the electrolyte by sputter deposition. In situ X-ray photoelectron spectroscopy (XPS) is used to investigate the resulting decomposition products. It was found that Li3InCl6 decomposes into In2O3 and indium metal, among others. Since indium metal is electronically conductive, the electrolyte will decompose until either Li3InCl6 or the lithium is depleted, thus the electrolyte cannot be used in direct contact with lithium. (Picture submitted by Luise Riegger)

Solid-state batteries have been researched and characterized with greater intensity in recent years due to their better properties compared to lithium-ion batteries, such as higher safety or broader operating temperature and comparable ionic conductivities. To compensate for the higher density of solid electrolytes, using lithium metal as anode material is necessary to obtain good gravimetric and volumetric energy densities. However, lithium metal is very reactive. If electronically conductive products are formed during the reaction of the solid electrolyte with lithium, this electrolyte cannot be in direct contact with lithium, otherwise short circuits may occur.      

In order to investigate the reaction products of the halide solid electrolyte Li3InCl6 with lithium, lithium is applied to the electrolyte by sputter deposition. In situ X-ray photoelectron spectroscopy (XPS) is used to investigate the resulting decomposition products. It was found that Li3InCl6 decomposes into In2O3 and indium metal, among others. Since indium metal is electronically conductive, the electrolyte will decompose until either Li3InCl6 or the lithium is depleted, thus the electrolyte cannot be used in direct contact with lithium. (Picture submitted by Luise Riegger)

The WG Janek is involved in the following networks
Logo BASF BASF-Forschungsnetzwerk "Elektrochemie und Batterien"
FestBatt

BMBF-Kompetenzcluster für Festkörperbatterien "FestBatt"


Project ProLiFest (Refining and processing of lithium foils and electrodes for solid-state batteries)
BMBF Logo


BMBF-Projekt ALISS

"Aluminium-Ionen-Batterie für stationäre Speichersysteme"

 
BMBF Logo


BMBF-Projekt ELONGATE

"Liquid Electrolytes for Next-Generation Battery Systems: Study and Implications of Reactive Species Solubility and Diffusivity"
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BMBF-Projekt FLiPS

"Feststoffbatterien mit Lithiummetall und Polymeren Schutzschichten"
BMBF Logo

BMBF-Projekt MaLiBa

"Maßgeschneiderte Lithium-Metall-Anoden für zukünftige Batteriesysteme"
BMBF Logo

BMBF-Projekt MaLiBa

"Maßgeschneiderte Lithium-Metall-Anoden für zukünftige Batteriesysteme"

BMBF-Projekt MeLuBatt

BMBF-Projekt MeLuBatt

 "Frischer Wind für Metall/Luftsauerstoff-Batterien:

Was man von Lithium-Ionen-Batterien lernen kann"
NASEBER

 BMBF-Projekt NASEBER

"Natriumbasierte feste Sulfid- und Oxid-Elektrolyt-Batterien"

BMBF Logo

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 Logo

BMBF - Deutsch-Taiwanesisches Programm

Projekt "AdamBatt"
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BMBF - Deutschland-USA (DE-US)

Projekte "LiSi" und "CatSE"
DFG-logo

DFG-Exzellenzinitiative - Cluster "POLIS"
German Israeli Battery School

German Israeli Battery School

 

Kooperationsprojekt mit Volkswagen AG "Modellierung von Feststoffbatterien"