Publications

# 028
Authors: S. Kremer, T. Fuchs, and J. K. Eckhardt*
Titel: Limitations of Impedance Spectroscopy in Detecting Interfacial Contact Quality – Insights from Metal Anode Dissolution in Solid-State Batteries
Journal: ChemRxiv (Preprint), 2026, tbd, tbd, tbd
DOI: https://doi.org/10.26434/chemrxiv.15007146/v1

# 027
Authors: T. A. Schall, M. Ziegler, M. Wacha, Q. Ma, F. Tietz, J. K. Eckhardt, C. Gan, A. S. Mijailovic, B. W. Sheldon, T. Fuchs, and J. Janek
Titel: The Evolution of Pore Volume during Stripping of Lithium, Sodium, and Potassium Metal Electrodes in Solid-State Batteries
Journal: ACS Electrochemistry, 2026, tbd, tbd, tbd
DOI: https://doi.org/10.1021/acselectrochem.6c00237

# 026
Authors: J. Schubert, S. Kremer, J. Hubl, P. Minnmann, F. Rossi, S. S. M. Ji, H. H. Richter, K. Hatzell, J. K. Eckhardt, A. Bielefeld, and J. Janek
Titel: Pouch Versus Press Cells – How Cell Configuration Dictates Low-Pressure Performance in Sulfide Solid-State Batteries
Journal: Journal of The Electrochemical Society, 2026, 173, 17, 170519
DOI: https://doi.org/10.1149/1945-7111/aea0a2

# 025
Authors: T. K. Hecker, J. K. Eckhardt, M. Becker, and P. J. Klar
Titel: Correlation between Hydrogen Diffusion and Hydrogen-Induced Structural Phase Evolution in β-MoO3 Thin Films
Journal: ACS Electrochemistry, 2026, 2, 8, 2005-2016
DOI: https://doi.org/10.1021/acselectrochem.6c00164

# 024
Authors: M. Ziegler, T. Ortmann, C. Glatthaar, J. M. Werner, V. K. Singh, B. Mogwitz, J. K. Eckhardt, B. M. Smarsly, L. F. Nazar, M. Rohnke, and J. Janek
Titel: Carbonaceous Interlayers as Contact Mediators for Sodium Electrodeposition in “Anode-Free” Solid-State Batteries
Journal: ACS Electrochemistry, 2026, 2, 8, 1887-1903
DOI: https://doi.org/10.1021/acselectrochem.6c00121

# 023
Authors: S. Kremer, C. D. Alt, L. Schuster, J. Westphal, B. Aktekin, J. Janek, and J. K. Eckhardt*
Titel: SEI Formation in Sulfide-Based Solid-State Batteries: Influence of Contact Conditions on Impedance-Derived Interphase Growth Kinetics
Journal: ACS Applied Materials Interfaces, 2026, 18, 23, 33450-33468
DOI: https://doi.org/10.1021/acsami.6c07844

# 022
Authors: J. Schubert, P. Minnmann, S. Kremer, J. K. Eckhardt, A. Bielefeld, and J. Janek
Titel: Evaluating the Pressure Dependence of Charge Transport in Composite Cathodes for Solid-State Batteries
Journal: ACS Electrochemistry, 2026, 2, 7, 1583-1597
DOI: https://doi.org/10.1021/acselectrochem.6c00144

# 021
Authors: S. Kremer, F. Schug, U. Sigar, R. Rekers, J. Schubert, C. Heiliger, F. H. Richter, A. Bielefeld, J. K. Eckhardt*, and J. Janek
Titel: Maxwell−Wagner Relaxation in Composite Electrolytes for Solid-State Batteries: Reevaluating Impedance Spectra and Charge Transport of Ceramic−Polymer Hybrids
Journal: ACS Electrochemistry, 2026, 2, 6, 1406-1421
DOI: https://doi.org/10.1021/acselectrochem.6c00069

# 020
Authors: C. D. Alt, J. Kessler-Kühn, J. K. Eckhardt, M. Stein, S. Chatterjee, M. T. Elm, and J. Janek
Titel: The partial electronic conductivity of lithium halides and their role in SEI formation in solid-state batteries – Hebb-Wagner-type measurements
Journal: Solid State Ionics, 2025, 429
DOI: https://doi.org/10.1016/j.ssi.2025.116991

# 019
Authors: T. A. Schall, T. Fuchs, J. K. Eckhardt, T. Klunz, B. Mogwitz, J. Sann, K. Peppler, and J. Janek
Titel: Evolution of Pore Volume During Stripping of Lithium Metal in Solid-State Batteries Observed with Operando Dilatometry
Journal: Small, 2025, 2505053
DOI: https://doi.org/10.1002/smll.202505053

# 018
Authors: J. Becker, T. Weintraut, S. L. Benz, T. Fuchs, C. Lerch, P. Becker, J. K. Eckhardt, A. Henß, F. H. Richter, and J. Janek
Titel: Purity of lithium metal electrode and its impact on lithium stripping in solid-state batteries
Journal: Nature Communications, 2025, 16, 1
DOI: https://doi.org/10.1038/s41467-025-61006-7

# 017
Authors: K. Vettori, S. Schröder, L. Ahrens, R. Wilhelm, S. Kremer, J. K. Eckhardt, T. Brezesinski, A. Kondrakov, J. Mayer, A. Henss, and J. Janek
Titel: Chemical and Structural Degradation of Single Crystalline High-Nickel Cathode Materials During High-Voltage Hold
Journal: Advanced Energy Materials, 2025, 2502148
DOI: https://doi.org/10.1002/aenm.202502148

# 016
Authors: C. G. Haslam, J. K. Eckhardt, A. Ayyaswamy, B. S. Vishnugopi, T. Fuchs, D. W. Liao, N. P. Dasgupta, P. P. Mukherjee, J. Janek, and J. Sakamoto
Titel: Evaluating Pressure‐dependent Discharge Behavior of Foil Versus In situ Plated Lithium Metal Anodes in Solid‐State Batteries
Journal: Advanced Energy Materials, 2024, 15, 12, 2403614
DOI: https://doi.org/10.1002/aenm.202403614

# 015
Authors: C. D. Alt, S. Keuntje, I. L. Schneider, J. Westphal, P. Minnmann, J. K. Eckhardt, K. Peppler, and J. Janek
Titel: In–Li Counter Electrodes in Solid‐State Batteries – A Comparative Approach on Kinetics, Microstructure, and Chemomechanics
Journal: Advanced Energy Materials, 2024, 15, 12, 2404055
DOI: https://doi.org/10.1002/aenm.202404055

# 014
Authors: L. Merola, V. K. Singh, M. Palmer, J. K. Eckhardt, S. L. Benz, T. Fuchs, L. F. Nazar, J. Sakamoto, F. H. Richter, and J. Janek
Titel: Evaluation of Oxide|Sulfide Heteroionic Interface Stability for Developing Solid-State Batteries with a Lithium–Metal Electrode: The Case of LLZO|Li6PS5Cl and LLZO|Li7P3S11
Journal: ACS Applied Materials & Interfaces, 2024, 16, 40, 54847-54863
DOI: https://doi.org/10.1021/acsami.4c11597

# 013
Authors: S. Kremer, R. Rekers, U. Sigar, J. Becker, J. Schubert, J. K. Eckhardt, A. Bielefeld, F. H. Richter, and J. Janek
Titel: A Simple Method for the Study of Heteroionic Interface Impedances in Solid Electrolyte Multilayer Cells Containing LLZO
Journal: ACS Applied Materials & Interfaces, 2024, 16, 33, 44236-44248
DOI: https://doi.org/10.1021/acsami.4c07845

# 012
Authors: J. K. Eckhardt*, S. Kremer, L. Merola, and J. Janek
Titel: Heteroionic Interfaces in Hybrid Solid-State Batteries – Current Constriction at the Interface between Different Solid Electrolytes
Journal: ACS Applied Materials & Interfaces, 2024, 16, 14, 18222-18235
DOI: https://doi.org/10.1021/acsami.4c01808

# 011
Authors: T. Ortmann, T. Fuchs, J. K. Eckhardt, Z. Ding, Q. Ma, F. Tietz, C. Kübel, M. Rohnke and J. Janek
Titel: Deposition of Sodium Metal at the Copper-NaSICON Interface for Reservoir-Free Solid-State Sodium Batteries
Journal: Advanced Energy Materials, 2023, 2302729
DOI: https://doi.org/10.1002/aenm.202302729

# 010
Authors: Z. Ding, Y. Tang, T. Ortmann, J. K. Eckhardt, Y. Dai, M. Rohnke, G. Melinte, C. Heiliger, J. Janek and C. Kübel
Titel: The Impact of Microstructure on Filament Growth at the Sodium Metal Anode in All Solid-State Sodium Batteries
Journal: Advanced Energy Materials, 2023, 13, 48, 2302322
DOI: https://doi.org/10.1002/aenm.202302322

# 009
Authors: J. K. Eckhardt*, S. Kremer, T. Fuchs, P. Minnmann, J. Schubert, S. Burkhardt, M. T. Elm, P. J. Klar, C. Heiliger and J. Janek
Titel: Influence of Microstructure on the Material Properties of LLZO Ceramics Derived by Impedance Spectroscopy and Brick Layer Analysis
Journal: ACS Applied Materials & Interfaces, 2023, 15, 40, 47260-47277
DOI: https://doi.org/10.1021/acsami.3c10060

# 008
Authors: J. K. Eckhardt*, C. Heiliger and M. T. Elm
Titel: Understanding the Impedance of Mesoporous Oxides: Reliable Determination of the Material-Specific Conductivity
Journal: ACS Applied Materials & Interfaces, 2023, 15, 29, 35332-35341
DOI: https://doi.org/10.1021/acsami.3c05561

# 007
Authors: J. K. Eckhardt*, T. Fuchs, S. Burkhardt, P. J. Klar, J. Janek and C. Heiliger
Titel: Guidelines for Impedance Analysis of Parent Metal Anodes in Solid-State Batteries and the Role of Current Constriction at Interface Voids, Heterogeneities and SEI
Journal: Advanced Materials Interfaces, 2023, 10, 8, 2202354
DOI: https://doi.org/10.1002/admi.202202354

# 006
Authors: T. Ortmann, S. Burkhardt, J. K. Eckhardt, T. Fuchs, Z. Ding, J. Sann, M. Rohnke, Q. Ma, F. Tietz, D. Fattakhova-Rohlfing, C. Kübel, O. Guillon, C. Heiliger and J. Janek
Titel: Kinetics and Pore Formation of the Sodium Metal Anode on NASICON-type Na4Zr2Si2.4P0.6O12 for Sodium Solid-State Batteries
Journal: Advanced Energy Materials, 2023, 13, 5, 2202712
DOI: https://doi.org/10.1002/aenm.202202712

# 005
Authors: J. K. Eckhardt*, T. Fuchs, S. Burkhardt, P. J. Klar, J. Janek, and C. Heiliger
Titel: 3D Impedance Modelling of Metal Anodes in Solid-State Batteries – Incompatibility of Pore Formation and Constriction Effect in Physical-Based 1D Circuit Models
Journal: ACS Applied Materials & Interfaces, 2022, 14, 37, 42757-42769
DOI: https://doi.org/10.1021/acsami.2c12991

# 004
Authors: J. K. Eckhardt*, P. E. Risius, M. Czerner, and C. Heiliger
Titel: Ab initio description of disorder effects in layered cathode active materials by the coherent potential approximation
Journal: J. Phys.: Condens. Matter, 2022, 34, 325501
DOI: https://doi.org/10.1088/1361-648x/ac7502

# 003
Authors: J. K. Eckhardt*, P. J. Klar, J. Janek, and C. Heiliger
Titel: Interplay of Dynamic Constriction and Interface Morphology between Reversible Metal Anode and Solid Electrolyte in Solid State Batteries
Journal: ACS Applied Materials & Interfaces, 2022, 14, 31, 35545-35554
DOI: https://doi.org/10.1021/acsami.2c07077

# 002
Authors: J. K. Eckhardt*, S. Burkhardt, J. Zahnow, M. T. Elm, J. Janek, P. J. Klar, and C. Heiliger
Titel: Understanding the Impact of Microstructure on Charge Transport in Polycrystalline Materials Through Impedance Modelling
Journal: Journal of The Electrochemical Society, 2021, 168, 090516
DOI: https://doi.org/10.1149/1945-7111/ac1cfe

# 001
Authors: S. Burkhardt, M. S. Friedrich, J. K. Eckhardt, A. C. Wagner, N. Bohn, J. R. Binder, L. Chen, M. T. Elm, J. Janek and P. J. Klar
Titel: Charge Transport in Single NCM Cathode Active Material Particles for Lithium-Ion Batteries Studied under Well-Defined Contact Conditions
Journal: ACS Energy Letters, 2019, 4, 2117–2123
DOI: https://doi.org/10.1021/acsenergylett.9b01579