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Prof. Dr.-Ing. Julia Kowal
- Julia Kowal
- © privat
Room: EMH 163
Address:
Einsteinufer 11
Sec. EMH 2
10587 Berlin
Phone: +49 (0)30 314-25394
Fax: +49 (0)30 314-21133
E-mail: Julia.Kowal@tu-berlin.de
Consultation hours: On Mondays 9 - 10 h and on appointment. In summer semester 2022 (25.4.-18.7.), the consultation hour will be from 10-11 h.
In most weeks, I am in the office on mondays, so a personal meeting is possible again. To be sure, please ask before you come. Alternatively, you can phone me or we can arrange a Zoom meeting.
Vita
| since 03/2014 | Chair of Electrical Energy Storage Technology at the TU Berlin |
|---|---|
| 01/10 - 02/14 | Senior engineer at the department of Electrochemical Energy Conversion and Storage Systems, ISEA, RWTH Aachen |
| 2010 | PhD at RWTH Aachen, Topic: "Spatially-resolved impedance of nonlinear inhomogeneous devices - using the example of the lead-acid battery" |
| 04/06-05/06 | Visiting researcher at the company Exide in Azuqueca de Hénares, Spain |
| 10/05-12/05 | Visiting Researcher at the research centre RISØ in Roskilde, Denmark |
| 11/04-12/09 | Research assistant at the department of Electrochemical Energy Storage Conversion and Systems at the Institute For Power Electronics and Electrical Drives (ISEA), RWTH Aachen |
| 10/99-11/04 | Studies of electrical engineering at RWTH Aachen Diploma thesis: "Investigation of the thermal behaviour of electrochemical energy storage systems in vehicle on-board power supplies" |
| 2006 | Herbert-Kind-Price of ETG in the VDE |
|---|---|
| 2006 | Brigitte-Berkenhoff-Price for the best graduate in the field of electrical engineering at RWTH Aachen |
| 2002 | Aachen's VDE price |
| 2001-2004 | Sponsorship through the Prof. Dr. Koepchen Merit Foundation (RWE) |
Publications
| Citation key | Salinas2_2020 |
|---|---|
| Author | Felipe Salinas and Julia Kowal |
| Pages | 140519 |
| Year | 2020 |
| DOI | 10.1149/1945-7111/abc207 |
| Journal | Journal of The Electrochemical Society |
| Volume | 167 |
| Number | 14 |
| Month | oct |
| Publisher | The Electrochemical Society |
| Abstract | A dataset is presented containing the rate capability measured for Lithium-ion cells obtained from old notebook batteries. The experimental results show an intersection of rate capabilities, related to degraded cells that exhibit high reversible capacities compared to the rated value and measured at 0.1C discharge rate, but a fast voltage decay and a constrained discharge capacity measured at 1C. With the aid of an electrochemical model it is shown that this intersection is possible if cells containing a lower concentration of Lithium salt in the electrolyte are compared to others that experienced a higher damage in the electrodes during their first use. This article casts doubts on the validity of a state of health determined from the discharge capacity measured at one rate for the classification of Li-ion batteries for a second life, if applied to datasets containing batteries experiencing diverse degradation paths. |