Post-Mortem Analysis of Calendar-Aged 16 Ah NMC/Graphite Pouch Cells for EV Application
| Autor: | Sylvie Genies, Margret Wohlfahrt-Mehrens, Amaia Iturrondobeitia, Niloofar Ghanbari, Frederic Aguesse, Michael Kasper, Thomas Waldmann, Emilie Bekaert |
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| Rok vydání: | 2017 |
| Předmět: |
General Energy
Materials science 020209 energy 0202 electrical engineering electronic engineering information engineering 02 engineering and technology Graphite Electrolyte Physical and Theoretical Chemistry Pouch Composite material Resting time Surfaces Coatings and Films Electronic Optical and Magnetic Materials |
| Zdroj: | The Journal of Physical Chemistry C. 121:21865-21876 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.7b05416 |
| Popis: | Application of Li-ion batteries for transportation not only requires long cycling life but also the preservation of the electrochemical performance during the resting period. For certain car usage this resting time could be predominant compared with the cycling activity and is referred to as calendar aging. To understand the aging mechanisms during calendar aging, an extensive post-mortem study was conducted on commercial 16 Ah NMC/graphite pouch cells stored at 5, 25, 45, and 60 °C. The post-mortem analyses were performed in parallel within three separate laboratories across Europe. They included visual inspection and structural and microstructural analysis along with a combination of analytical techniques to determine accurately the composition of positive (NMC) and negative (graphite) electrodes and the electrolyte. A direct correlation was established between the calendar-aging temperature and the degradation of the cells. The measurements revealed a severe deterioration phenomenon for the electrodes ... |
| Databáze: | OpenAIRE |
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