Dr. Meinert Lewerenz

Research

Main research

• Head of the own research group I-BasE with focus on float current analysis, modeling and measurement technology development
• Scientific investigations on Li-ion cells
  • Differential voltage analysis and homogeneity
  • Influence of high frequency switching on aging
  • Investigation of float currents for cal. Aging

Current projects

• Innovative Battery Test Strategies for the Energy System Transformation (I-BasE)
• Diagnostics of Battery Cells and Battery Packs
• Research on fast and high-precision float current technology as an alternative to conventional calendar ageing tests on lithium ion cells and research on fast parameterizable ageing prognosis simulations
• Research Environment for Safe Learning Battery Systems (FUsLeBat)
• Accelerated Aging Tests and Lifetime Predictions (BALd)

Vita

• since 2022: Head of the junior research group I-BasE (Innovative Battery Test Strategies for the Energy System Transformation)
• since 2018: Senior Scientist in the research group Electromobility and Learning Systems at the Institute for Innovative Mobility (IIMo) at the Technische Hochschule Ingolstadt
• 2018: PhD at RWTH with the title "Dissection and Quantitative Description of Aging of Lithium-Ion Batteries Using Non-Destructive Methods Validated by Post-Mortem-Analyses"
• 2013-2018: Research Assistant/PhD student in the Department of Materials Analysis and Lifetime Prediction at the Institute for Power Electronics and Electrical Drives (ISEA) at RWTH Aachen University.
• 2009-2013: Research associate in the department of energy storage at the EWE Research Center for Energy Technology e.V. NEXT ENERGY in Oldenburg (today DLR)
• 2009: Referent at the Federal Ministry for the Environment, Nature Conservation and Nuclear Safety (BMU)
• 2008: Research associate in the field of thermoelectrics at the Institute of Materials Research at the German Aerospace Center (DLR) in Cologne-Porz
• 2002-2007: Physics studies first at the University of Heidelberg followed by a transfer to the University of Bonn, Diploma in Physics

Publications

• 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.