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Increased Moisture Uptake of NCM622 Cathodes after Calendering due to Particle Breakage

Huttner, Fabienne; Diener, Alexander; Heckmann, Thilo ORCID iD icon 1; Eser, Jochen C. 1; Abali, Tugay; Mayer, Julian K.; Scharfer, Philip 1; Schabel, Wilhelm 1; Kwade, Arno
1 Karlsruher Institut für Technologie (KIT)


As moisture presents a critical contamination in lithium-ion batteries (LIBs), electrodes and separators need to be post-dried before cell assembly. The moisture adsorption, desorption and re-adsorption of electrodes during processing is strongly dependent on their material system, manufacturing route and microstructure. The microstructure, in turn, is significantly defined by the coating density, which is adjusted by calendering. As a consequence, the calendering step is expected to directly influence the moisture sorption behavior of electrodes. This is why the influence of different coating densities and structural properties on the moisture content of NCM622 cathodes was investigated in this study. For increasing density, an increasing moisture content was detected by Karl Fischer Titration and sorption measurements. SEM and BET analyses showed an increasing amount of NCM622 particle breakage, accompanied by a rising surface area. Hence, the increased moisture uptake of cathodes with higher density is mainly caused by a higher surface area, which results from particle cracking and breakage during calendering. Electrochemical analysis showed that the increased active surface area of cathodes with higher densities leads to a good performance during formation and at low C-rates. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000138418
Veröffentlicht am 01.10.2021
DOI: 10.1149/1945-7111/ac24bb
Zitationen: 31
Web of Science
Zitationen: 30
Zitationen: 30
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Thermische Verfahrenstechnik (TVT)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2021
Sprache Englisch
Identifikator ISSN: 0013-4651, 1945-7111
KITopen-ID: 1000138418
HGF-Programm 43.31.02 (POF IV, LK 01) Devices and Applications
Erschienen in Journal of the Electrochemical Society
Verlag Electrochemical Society
Band 168
Heft 9
Seiten Art.-Nr.: 090539
Vorab online veröffentlicht am 20.09.2021
Nachgewiesen in Dimensions
Web of Science
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