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Preprints
https://doi.org/10.5194/mr-2024-20
https://doi.org/10.5194/mr-2024-20
18 Nov 2024
 | 18 Nov 2024
Status: a revised version of this preprint was accepted for the journal MR and is expected to appear here in due course.

Innovative L-band electron paramagnetic resonance investigation of solid-state pouch cell batteries

Charles-Emmanuel Dutoit, Raffaella Soleti, Jean-Marie Doux, Vincent Pelé, Véronique Boireau, Christian Jordy, Simon Pondaven, and Hervé Vezin

Abstract. Usually, the conventional electron paramagnetic resonance (EPR) spectroscopy and imaging use a microwave cavity operating at X-band, i.e. with an excitation frequency of around 9.6 GHz, and remains the most popular mode in the magnetic characterization of lithium batteries to date. We provide here the first low-frequency EPR investigations for monitoring the metallic lithium structures in the solid-state pouch cell batteries. We show that L band, i.e. a microwave frequency of around 1.01 GHz, is an invaluable method to probe in depth the electrode components through a standard pouch cell using aluminum laminated film for packaging without opening the battery. These results offer a new approach for monitoring the nucleation of micrometric and sub-micrometric lithium particles such as dendritic lithium structures which is an important step in the development of reliable solid-state batteries.

Competing interests: At least one of the (co-)authors is a member of the editorial board of Magnetic Resonance.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
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Short summary
We have performed a low frequency EPR study on two solid-state batteries (NMC||Li-metal and...
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