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Microscale Discrete Element Method Simulation of the Carbon Black Aggregate Fracture Behavior in a Simple Shear Flow

Asylbekov, Ermek; Trunk, Robin; Krause, Mathias; Nirschl, Hermann

Abstract:
The shear stress induced breaking behavior of carbon black (CB) aggregates during the manufacturing process of Li‐ion batteries is investigated via microscale discrete element method (DEM) simulations. The relevant range of shear stress is chosen according to a planetary mixer and cathode slurries with high solid content. Aggregates of different sizes and shapes are modeled using a self‐written algorithm based on the tunable dimension method. Then, suitable models are chosen for representing the solid bridges between the primary particles of the CB aggregates and relevant fluid forces. The results show a correlation between aggregate size and critical shear stress which is required to initiate aggregate fracturing. Furthermore, a change in aggregate shape is linked to applied stress and initial aggregate size and shape. Hence, a recommendation for an efficient disintegration of CB aggregates during the mixing process is made.

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Verlagsausgabe §
DOI: 10.5445/IR/1000129549
Veröffentlicht am 10.02.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mechanische Verfahrenstechnik und Mechanik (MVM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2194-4288, 2194-4296
KITopen-ID: 1000129549
Erschienen in Energy technology
Verlag Wiley-VCH Verlag
Seiten Art.-Nr.: 2000850
Vorab online veröffentlicht am 14.01.2021
Nachgewiesen in Dimensions
Scopus
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