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Investigation of Transverse Relaxation Rate Distribution via Magnetic Resonance Imaging: Impact of Electrode Formation

Balbierer, Roland; Seegert, Philipp; Herberger, Sabrina; Wetzel, Thomas; Nirschl, Hermann; Guthausen, Gisela

Abstract:
The impact of electrode formation is studied by the spatially and time‐resolved distribution of transverse relaxation. In situ $^{7}$Li nuclear magnetic resonance experiments are performed on an experimental lithium‐ion battery cell to study the impact of electrode passivation via imaging and transverse relaxation in the interelectrode volume. The electrolyte in the battery, using technically relevant electrode material, i.e., graphite and lithium–nickel–cobalt–manganese–oxide, is studied by 2D magnetic resonance imaging. The electrolyte is 1 mol L$^{-1}$ lithium hexafluorophosphate dissolved in a binary mixture of ethylene carbonate and dimethyl carbonate. 1D profiles are acquired and related to $^{7}$Li concentration during passivation and during a constant current/constant voltage cycle. The transverse relaxation rate R$_{2}$(z,t) measured by multiecho profiles revealed changes within the electrolyte volume. The ongoing process changes the relaxation distribution. Indications for a defective electrode passivation are deduced from the data. During one charging cycle with constant current/constant voltage, the lithium concentration is measured spatially resolved, and the data are modeled by the Nernst–Planck equation.

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Verlagsausgabe §
DOI: 10.5445/IR/1000125545
Veröffentlicht am 31.10.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)
Institut für Mechanische Verfahrenstechnik und Mechanik (MVM)
Institut für Thermische Verfahrenstechnik (TVT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2194-4288, 2194-4296
KITopen-ID: 1000125545
Erschienen in Energy technology
Seiten 2000579
Vorab online veröffentlicht am 19.08.2020
Nachgewiesen in Scopus
Web of Science
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