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Technical University of Munich

Dr.-Ing. Andreas Ehrl

Contact

Email: ehrl-andreas(...)tum.de

 

PhD thesis

Determination of Transport Parameters of Binary Electrolyte Solutions for the Use in Numerical Simulations

 

Research Interests

 

Teaching

 

Supervised Student Projects

  • Analysis and Characterization of Olivine Cathode Materials for Automotive Lithium-ion Batteries (Johannes Landesfeind, Master thesis in cooperation with the Chair for Technical Electrochemistry, the Physik Department E19 and the BMW Group, 2013)
  • Bestimmung der Übergangszahl durch potentiostatische Polarisation (Harald Willmann, Bachelor thesis, 2013)
  • Experimental determination of transport parameters for a binary electrolyte (Jungnoh Lee, Master thesis in cooperation with the Institute for Technical Electrochemistry, 2013)
  • Simplified ion-transport model for a Lithium-air battery (Sonja Schramm, student project, 2013)
  • Thermo-Struktur Kopplung in Baci (Konstantin Ritt, MSE student project, 2012)
  • Thermo-Struktur Kopplung in Ansys (Eileen Kristin Wilhelm, MSE student project, 2012)
  • Modeling of ionic liquids as an electrolyte for Lithium-ion batteries (Jungnoh Lee, student project in cooperation with the Institute for Technical Electrochemistry, 2012)
  • Extended reaction models for the numerical simulation of electrochemical systems (David Wittmann, Bachelor thesis, 2011) 

 

Publications

 Articles in Peer-Reviewed International Journal

  • A. Ehrl, J. Landesfeind, W.A. Wall, H. Gasteiger, Determination of transport parameters in liquid binary electrolytes: Part II. Transference number, Journal of the Electrochemical Society 164 (2017) A2716-A2731. doi: 10.1149/2.1681712jes
  • A. Ehrl, J. Landesfeind, W.A. Wall, H. Gasteiger, Determination of transport parameters in liquid binary lithium ion battery electrolytes: Part I. Diffusion coefficient, Journal of the Electrochemical Society 164 (2017) A826-A836. doi: 10.1149/2.1131704jes
  • J. Landesfeind, J. Hattendorff, A. Ehrl, W.A. Wall, H.A. Gasteiger, Tortuosity determination of battery electrodes and separators by impedance spectroscopy, Journal of the Electrochemical Society 163 (2016) A1373-A1387. DOI:10.1149/2.1141607jes (Errata)
  • J. Landesfeind, A. Ehrl, M. Graf, W.A. Wall, H.A. Gasteiger, Direct electrochemical determination of thermodynamic factors in aprotic binary electrolytes, Journal of the Electrochemical Society 163 (2016) A1254-A1264. DOI:10.1149/2.0651607jes
  • C.J. Roth, A. Ehrl, T. Becher, I. Frerichs, N. Weiler, W.A. Wall, Correlation between alveolar ventilation and electrical properties of lung parenchyma, Physiological Measurement 36 (2015) 1211–1226. DOI:10.1088/0967-3334/36/6/1211
  • A. Ehrl, A. Popp, V. Gravemeier, W.A. Wall, A dual mortar approach for mesh tying within a variational multiscale method for incompressible flow, International Journal for Numerical Methods in Fluids 76 (2014) 1-27.

    DOI: 10.1002/fld.3920

     

     

  • A. Ehrl, G. Bauer, V. Gravemeier, W.A. Wall, Simulating natural convection

    in electrochemical cells by a stabilized finite element approach, Journal of Computational Physics 235 (2013) 764–785.

    DOI: 10.1016/j.jcp.2012.08.043

     

International Conference Proceedings:

  •  J. Hattendorff, J. Landesfeind, A. Ehrl, W.A. Wall, H.A. Gasteiger, Effective ionic resistance in battery separators, Transactions of The Electrochemical Society 69 (2015) 135-140. DOI:10.1149/06901.0135ecst

Presentations with abstract:

  • J. Landesfeind, A. Ehrl, M. Frankenberger, W. A. Wall, H. A. Gasteiger "Temperature Dependent Thermodynamic Factors and Transference Numbers of Lithium Ion Battery Electrolytes" 12th Symposium on Fuel Cell and Battery Modelling and Experimental Validation, Freiburg, Germany, March 26 - 27, 2016
  • J. Hattendorff, J. Landesfeind, A. Ehrl, W.A. Wall, H.A. Gasteiger, “Effective ionic resistivity in battery materials” 228th Electrochemical Society Meeting, Phoenix, USA, October 11 – 15, 2015.
  •  J. Landesfeind, J. Hattendorff, A. Ehrl, W.A. Wall, H.A. Gasteiger “Electrochemical impedance spectroscopy as a tool for characterization of lithium ion battery materials”, 8th International Workshop on Impedance Spectroscopy, Chemnitz, Germany, September 23 – 25, 2015.
  • "Experimental determination of transport parameters for binary electrolyte solutions for use in numerical simulations", 11th Symposium on Fuel Cell and Battery Modelling and Experimental Validation,Winterthur, Switzerland, March 17-19, 2014.
  • "Towards a computational method for advanced battery systems supported by experimentally determined parameters", 10th Symposium on Fuel Cell and Battery Modelling and Experimental Validation, Bad Boll/Stuttgart, Germany, March 19-20, 2013.
  • "A finite element method for simulating natural convection in electrochemical cells", 4th GACM Colloquium on Computational Mechanics, Dresden, Germany, August 31 - September 2, 2011.

Posters with abstract:

  • J. Landesfeind, A. Ehrl, W.A. Wall, H.A. Gasteiger, "Parameter Determination in Non-Aqueous Lithium Ion Battery Electrolytes", Gordon Research Conference and Seminar, Ventura, CA, USA, February 21 - 26, 2016.
  • J. Landesfeind, A. Ehrl, W.A. Wall, H. Gasteiger, "Direct Electrochemical Determination of Binary Salt Activity Coefficient in Non-Aqueous Electrolytes", 12th Symposium on Fuel Cell and Battery Modelling and Experimental Validation, Freiburg, Germany, July 26-27, 2015
  • "Experimental Determination of Transport Parameters for Binary Electrolyte Solutions for Use in Numerical Simulations", 2nd MSE Colloquium, Munich, Germany, July 4, 2013.
  • "Modeling of ionic liquids as electrolyte for Lithium batteries", 1st MSE Colloquium, Munich, Germany, June 28, 2012.
  • "Numerical simulation of natural convection in electrochemical cells", 4th GACM Colloquium on Computational Mechanics, Dresden, Germany, August 31- September 2, 2011: Poster

Posters:

  • "A mortar method for incompressible fluid flow discretized by non-matching grids in a stabilized finite element framework": Poster

Research report:

  • EEBatt Dezentrale Stationäre Batteriespeicher zur effizienten Nutzung Erneuerbarer Energien und Unterstützung der Netzstabilität Zwischenbericht 2015
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