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Identification of morphology-critical stages during drying of particulate electrode slurries

Jaiser, S.; Müller, M.; Baunach, M.; Bauer, W.; Scharfer, P.; Schabel, W.

Abstract:
The evolution of film morphology during the drying of disperse coating media is a process that is still insufficiently understood in spite of its paramount importance for film properties. Up to date, experimental drying processes are often based on empirical parameter studies and not on sound scientific understanding of the basic processes. Lithium-ion battery electrodes have been an intensely discussed subject in recent years. In industrial manufacturing, slurries are commonly cast continuously on a substrate and dried in subsequent belt dryers. During drying, the film solidifies and a complex, porous structure evolves. The properties of the film and, therefore, the battery cell strongly depend on the component distribution set during this process. Electrode slurries consisting of graphite, carbon black as well as two different binder systems were applied on a copper substrate by doctor blade and dried homogeneously and isothermally under well-defined boundary conditions in a unique and optimized impingement drying set-up. The drying rates adjusted by the film temperature and the mass transfer coefficient fell within the range appl ... mehr


Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Keramische Werkstoffe und Technologien (IAM-KWT)
Institut für Mikrostrukturtechnik (IMT)
Institut für Thermische Verfahrenstechnik (TVT)
Publikationstyp Vortrag
Jahr 2015
Sprache Englisch
Identifikator KITopen ID: 230100861
HGF-Programm 37.01.02; LK 01
Erschienen in 7.Internationalen Fachtagung 'Kraftwerk Batterie - Lösungen für Automobil und Energieversorgung', Aachen, 27.-29.April 2015
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