Dr. Meinert Lewerenz

Forschung

Forschungsschwerpunkte

• Leitung der eigenen Forschungsgruppe I-BasE mit den Schwerpunkten Floatstromanalyse, Modellierung und Messtechnikentwicklung

• Wissenschaftliche Untersuchungen an Li-Ionen-Zellen

  • Differentielle Spannungsanalyse und Homogenität

  • Einfluss von Hochfrequenzschalten auf die Alterung

  • Untersuchung von Floatströmen für kal. Alterung

Aktuelle Projekte

• Innovative Batterieteststrategien für die Energiewende (I-BasE)
• Diagnostik von Batteriezellen und -packs
• Forschung zur schnellen und hochpräzisen Floatstromtechnologie als Alternative zu herkömmlichen kalendarischen Alterungstests an Lithium-Ionen-Zellen und Erforschung von schnell parametrierbaren Alterungsprognosesimulationen
• Forschungsumgebung für sichere Lernfähige Batteriesysteme
• Beschleunigte Alterungstests und Lebensdauerprognosen

Vita

• seit 2022: Leiter der Nachwuchsforschungsgruppe I-BasE (Innovative Batterieteststrategien für die Energiewende)
• seit 2018: Technologiefeldleiter in der Forschungsgruppe Elektromobilität und Lernfähige Systeme am Institut für Innovative Mobilität (IIMo) an der Technischen Hochschule Ingolstadt
• 2018: Promotion an der RWTH mit dem Titel „Dissection and Quantitative Description of Aging of Lithium-Ion Batteries Using Non-Destructive Methods Validated by Post-Mortem-Analyses“
• 2013-2018: Wissenschaftlicher Mitarbeiter/Doktorand in der Abteilung Materialanalyse und Lebensdauerprognose am Institut für Stromrichtertechnik und elektrische Antriebe (ISEA) an der RWTH Aachen
• 2009-2013: Wissenschaftlicher Mitarbeiter in der Abteilung Energiespeicher am EWE-Forschungszentrum für Energietechnologie e.V. NEXT ENERGY in Oldenburg (heute DLR)
• 2009: Referent am Bundesministerium für Umwelt, Naturschutz und Reaktorsicherheit (BMU)
• 2008: Wissenschaftlicher Mitarbeiter im Bereich Thermoelektrik am Institut für Werkstoff-Forschung am Deutschen Zentrum für Luft- und Raumfahrt (DLR) in Köln-Porz
• 2002-2007: Physikstudium zunächst an der Universität Heidelberg mit anschließendem Wechsel an die Universität Bonn, Diplom in Physik

Veröffentlichungen

• S. Schwertner, T. Buchberger, S. Diehl, R. Ferg, C. Hanzl, C. Hartmann, M. Hölzle, J. Kleiner, L. Komsiyska, M. Lewerenz, B. Liebhart, M. Schmid, D. Schneider, F. Scholz, S. Speer, J. Stöttner, C. Terbrack, M. Hinterberger, C. Endisch, Design and Implementation of an Intelligent Reconfigurable High-Voltage Battery System for Next-Generation Electric Vehicles, Batteries 11 (11) (2025) 424. https://doi.org/10.3390/batteries11110424.

• I. Kiran, M. Azzam, C. Endisch, N. Z. Butt, M. Lewerenz, Evaluation of Calendar Aging in Cells with Graphite: Silicon Anode Using Float Current Analysis Under the Influence of Voltage Hysteresis, Journal of Electrochemical Society, Volume 172, Number 10 (2025). doi: 10.1149/1945-7111/ae0fe8. 

• P. Morales Torricos, A. Gallenberger, D. Droese, J. Kowal, C. Endisch, M. Lewerenz, Analyzing the Impact of Electrolyte Motion Induced Salt Inhomogeneity Effect on Apparent Aging: Role of Current Rates and Temperature Effects in Accelerated Cyclic Aging Tests in Li-Ion Batteries, Batteries & Supercaps (2025), e202500559. https://doi.org/10.1002/batt.202500559.

• M. Azzam, D.-U. Sauer, C. Endisch, M. Lewerenz, Comprehensive Analysis of Float Current Behavior and Calendar Aging Mechanisms in Lithium-Ion Batteries, Batteries & Supercaps (2025). https://doi.org/10.1002/batt.202500349.

• M. Azzam, A. Aydin, C. Endisch, D.-U. Sauer, M. Lewerenz, Float Current Analysis for Lithium-Ion Battery Aging: Insights into SEI Growth and Cathode Lithiation with EIS and ICP OES, Journal of The Electrochemical Society, Volume 172, Number 7 (2025). doi: 10.1149/1945-7111/adef85.

• Q. Yu, I. Kiran, M. Ehrensberger, L. Streck, T. Roth, A. Jossen, C. Endisch, M. Lewerenz, Assigning Calendar Aging during Open Circuit and Float Current Analysis to Anode and Cathode Aging Using Three-Electrode Cells, Journal of The Electrochemical Society, Volume 172, Number 6 (2025). doi: 10.1149/1945-7111/ade295.

• P. Morales Torricos, S. Berg, E. Figgemeier, C. Endisch, M. Lewerenz, The important role of lithiation-induced pressure change on apparent aging of lithium-ion batteries during accelerated cyclic aging tests, Journal of Energy Storage, Volume 131, Part A (2025). https://doi.org/10.1016/j.est.2025.117323.

• M. Schreiber, Y. Lin, A. Sommer, N. Wassiliadis, P. Morales Torricos, M. Rogge, M. Lewerenz, C. Grosu, C. Endisch, A. Jossen, M. Lienkamp, Apparent vs. true battery aging: Impact of various load characteristics on accelerated aging tests, Journal of Energy Storage, Volume 127 (2025). https://doi.org/10.1016/j.est.2025.116924.

• M. Azzam, M. Ehrensberger, C. Endisch, D.-U. Sauer, M. Lewerenz, Comparison of dU/dQ, Voltage Decay, and Float Currents via Temperature Ramps and Steps in Li-ion Batteries, Batteries & Supercaps (2024), e202400627. https://doi.org/10.1002/batt.202400627.

• M. Azzam, M. Ehrensberger, C. Endisch, M. Lewerenz, Accelerating float current measurement with temperature ramps revealing entropy insights, Journal of Energy Storage, Volume 102, Part B (2024). https://doi.org/10.1016/j.est.2024.114142.

• S. Paarmann, M. Schreiber, A. Chahbaz, F. Hildenbrand, G. Stahl, M. Rogge, P. Dechent, O. Queisser, S. D. Frankl, P. Morales Torricos, Y. Lu, N. I. Nikolov, M. Kateri, D. U. Sauer, M. A. Danzer, T. Wetzel, C. Endisch, M. Lienkamp, A. Jossen, M. Lewerenz, Short-Term Tests, Long-Term Predictions – Accelerating Ageing Characterisation of Lithium-Ion Batteries, Batteries & Supercaps (2024), e202300594. https://doi.org/10.1002/batt.202300594.

• M. Azzam, C. Endisch, M. Lewerenz, Evaluating the Aging-Induced Voltage Slippery as Cause for Float Currents of Lithium-ion Cells, Batteries 10(1) (2024) 3. https://doi.org/10.3390/batteries10010003.

• M. Azzam, M. Ehrensberger, R. Scheuer, C. Endisch, M. Lewerenz, Long-Term Self-Discharge Measurements and Modelling for Various Cell Types and Cell Potentials, Energies 16(9) (2023) 3889. https://doi.org/10.3390/en16093889.

• P. Morales Torricos, C. Endisch, M. Lewerenz, Apparent Aging during Accelerated Cycling Aging Test of Cylindrical Silicon Containing Li-Ion Cells, Batteries 9 (4) (2023) 230. https://doi.org/10.3390/batteries9040230.

• X. Straßer, G. W. Ngaleu, C. Hanzl, M. Azzam, C. Endisch, M. Lewerenz, Influence of Switching on the Aging of High Energy Lithium-Ion Cells, Batteries 9 (2) (2023) 139. https://doi.org/10.3390/batteries9020139.

• G. W. Ngaleu, M. Theiler, X. Straßer, C. Hanzl, L. Komsiyska, C. Endisch, M. Lewerenz, Influence of Switching on the Aging of High Power Lithium-Ion Cells, Batteries 8(4) (2022), 33. https://doi.org/10.3390/batteries8040033.

• L. Komsiyska, T. Buchberger, S. Diehl, M. Ehrensberger, C. Hanzl, C. Hartmann, M. Hölzle, J. Kleiner, M. Lewerenz, B. Liebhart, M. Schmid, D. Schneider, S. Speer, J. Stöttner, C. Terbrack, M. Hinterberger, C. Endisch, Critical Review of Intelligent Battery Systems: Challenges, Implementation, and Potential for Electric Vehicles, Energies 14 (2021) 5989. https://doi.org/10.3390/en14185989.

• M. Theiler, C. Endisch and M. Lewerenz, Float Current Analysis for Fast Calendar Aging Assessment of 18650 Li(NiCoAl)O2/Graphite Cells, Batteries 7 (2021) 22. https://doi.org/10.3390/batteries7020022.

• M. Lewerenz, C. Rahe, G. Fuchs, C. Endisch, D.U. Sauer, Evaluation of shallow cycling on two types of uncompressed automotive Li (Ni1/3Mn1/3Co1/3)O2-Graphite pouch cells, Journal of the Electrochemical Society 30 (2020). https://doi.org/10.1016/j.est.2020.101529.

• S. Liu, M. Winter, M. Lewerenz, J. Becker, D.U. Sauer, Z. Ma, J. Jiang, Analysis of cyclic aging performance of commercial Li4Ti5O12-based batteries at room temperature, Energy 173 (2019) 1041–1053. https://doi.org/10.1016/j.energy.2019.02.150.

• M. Lewerenz, P. Dechent, D.U. Sauer, Investigation of capacity recovery during rest period at different states-of-charge after cycle life test for prismatic Li(Ni1/3Mn1/3Co1/3)O2-graphite cells, Journal of Energy Storage 21 (2019) 680–690. https://doi.org/10.1016/j.est.2019.01.004.

• M. Lewerenz, D.U. Sauer, Evaluation of cyclic aging tests of prismatic automotive LiNiMnCoO2-Graphite cells considering influence of homogeneity and anode overhang, Journal of Energy Storage 18 (2018) 421–434. https://doi.org/10.1016/j.est.2018.06.003.

• M. Lewerenz, G. Fuchs, L. Becker, D.U. Sauer, Irreversible calendar aging and quantification of the reversible capacity loss caused by anode overhang, Journal of Energy Storage 18 (2018) 149–159. https://doi.org/10.1016/j.est.2018.04.029.

• M. Lewerenz, A. Warnecke, D.U. Sauer, Post-mortem analysis on LiFePO4|Graphite cells describing the evolution & composition of covering layer on anode and their impact on cell performance, J. Power Sources 369 (2017) 122–132. https://doi:10.1016/j.jpowsour.2017.10.003.

• M. Lewerenz, A. Marongiu, A. Warnecke, D.U. Sauer, Differential voltage analysis as a tool for analyzing inhomogeneous aging: a case study for LiFePO4|Graphite cylindrical cells, J. Power Sources 368 (2017) 57–67. https://doi:10.1016/j.jpowsour.2017.09.059.

• M. Lewerenz, A. Warnecke, D.U. Sauer, Introduction of capacity difference analysis (CDA) for analyzing lateral lithium-ion flow to determine the state of covering layer evolution, J. Power Sources 354 (2017) 157–166. https://doi.org/10.1016/j.jpowsour.2017.04.043.

• M. Lewerenz, J. Münnix, J. Schmalstieg, S. Käbitz, M. Knips, A. Warnecke, D.U. Sauer, New method evaluating currents keeping the voltage constant for fast and high resolved measurement of Arrhenius relation and capacity fade, J. Power Sources 353 (2017) 144–151. https://doi:10.1016/j.jpowsour.2017.03.136.

• M. Lewerenz, J. Münnix, J. Schmalstieg, S. Käbitz, M. Knips, D.U. Sauer, Systematic aging of commercial LiFePO4jGraphite cylindrical cells including a theory explaining rise of capacity during aging, J. Power Sources 345 (2017) 254–263. https://doi:10.1016/j.jpowsour.2017.01.133.

• L. Komsiyska, S.A.G. Barragan, M. Lewerenz, D. Ledwoch, O. Osters, Detecting Aging Phenomena in Commercial Cathodes for Li-ion Batteries using High Resolution Computed Tomography 93 (2014) 158–163. https://doi:10.4028/www.scientific.net/AST.93.158.

• M. Radicke, A. Engelbertz, B. Habenstein, M. Lewerenz, O. Oehms, P. Trautner, B. Weber, S. Wrede, K. Maier, New image contrast method in magnetic resonance imaging via ultrasound, Hyperfine Interact 181 (2008) 21–26. https://doi:10.1007/s10751-008-9628-6.