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An experimental and analytical study on intermittent slot die coating of viscoelastic battery slurries / Marcel Schmitt in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 5 (09/2015)
[article]
Titre : An experimental and analytical study on intermittent slot die coating of viscoelastic battery slurries Type de document : texte imprimé Auteurs : Marcel Schmitt, Auteur ; Ralf Diehm, Auteur ; Philip Scharfer, Auteur ; Wilhelm Schabel, Auteur Année de publication : 2015 Article en page(s) : p. 927-938 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Accumulateurs lithium-ion
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Fluides non newtoniens
Revêtements:Peinture
ViscoélasticitéIndex. décimale : 667.9 Revêtements et enduits Résumé : Large-scale secondary lithium-ion batteries could be a key technology to compensate for the inconsistent energy supply of renewable sources. However, their manufacture is still very costly. In particular, the intermittent slot die coating of the battery electrodes is the speed-limiting and thus cost-driving process. In this field, various patents have been granted, and most in-house coating equipment was developed in industry. These technologies are often optimized empirically, since intermittent slot die coating is not mentioned in the scientific literature. In this work, we investigate the dominating and limiting mechanisms for intermittent slot die coating of non-Newtonian battery slurries. To characterize the process, we measured the system and die pressure and the associated wet film thickness. To build a common basis for all established technologies, we reduced the coating system to a syringe pump, a bypass valve, and a slot die. Our results show the direct link between casted film and pressure distribution within the coating. To reduce leveling times between the coating and interruption phases of an intermittent coating, a model was developed to predict the optimum pressure levels. It was found that different pressure levels during the coating and interruption phases lead to film break-ups or downstream die swelling, and thus limit the whole process. DOI : 10.1007/s11998-015-9717-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9717-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24694
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Code-barres Cote Support Localisation Section Disponibilité 17467 - Périodique Bibliothèque principale Documentaires Disponible An overview of planar flow casting of thin metallic glasses and its relation to slot coating of liquid films / Eric A. Theisen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)
[article]
Titre : An overview of planar flow casting of thin metallic glasses and its relation to slot coating of liquid films Type de document : texte imprimé Auteurs : Eric A. Theisen, Auteur ; Steven J. Weinstein, Auteur Année de publication : 2022 Article en page(s) : p. 49-60 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alliages
Coulée à flux planaire
Défauts
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Matériaux amorphesIndex. décimale : 667.9 Revêtements et enduits Résumé : Planar flow casting (PFC) is a method that can be used to make thin, long, and wide metallic alloy foils by extruding molten liquid through a nozzle slot and immediately quenching on a moving roller. The quenching rates are high enough that amorphous metallic glasses may be formed that have many desirable properties for a wide variety of applications. This paper reviews how PFC processes were developed, examines the typical operability range of PFC, and reviews the defects that commonly form. The geometrical similarities between PFC and slot coating process are apparent, and this paper highlights differences between the operability ranges of both processes. Note de contenu : - Thin metallic glass processing and the development of planar flow casting
- Planar flow casting (PFC) process conditions
- Defect formation : Defects arising from casting wheel - Flow related defects
- Comparison of planar flow casting (PFC) and conventional slot coating
- Table 1: PFC process conditions for the Cornell aluminum-silicon (Al-Si)-based crystalline foils, obtained via batch casting, and the Metglas iron (Fe)-based amorphous foils, obtained via continuous castingDOI : https://doi.org/10.1007/s11998-021-00503-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00503-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37144
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Code-barres Cote Support Localisation Section Disponibilité 23313 - Périodique Bibliothèque principale Documentaires Disponible Analytical determination of process windows for bilayer slot die coating / Marcel Schmitt in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 5 (09/2015)
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Titre : Analytical determination of process windows for bilayer slot die coating Type de document : texte imprimé Auteurs : Marcel Schmitt, Auteur ; Sebastian Raupp, Auteur ; Dennis Wagner, Auteur ; Philip Scharfer, Auteur ; Wilhelm Schabel, Auteur Année de publication : 2015 Article en page(s) : p. 877-887 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Accumulateurs lithium-ion
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Fluides non newtoniens
Revêtements multicouchesIndex. décimale : 667.9 Revêtements et enduits Résumé : Slot die coating is a film casting process with a highly diverse variety of everyday applications. As a pre-metered process it not only guarantees excellent film uniformity, but is also suitable for simultaneously applied multilayer coatings. Characteristic singularities like the behavior of the liquid–liquid interface and the impact of the additional mid-lip on film uniformity were already investigated before. However, the effect of an altered gap pressure regime on commonly used coating windows has not yet been discussed. In this work, we therefore extended available single-layer coating windows for Newtonian and power-law liquids to the bilayer case. Here, the emphasis was laid on the air entrainment limit. Subsequently, the theoretical results were compared to experimental data. It was found that the onset of air entrainment strongly depends on the top to bottom film thickness ratio for bilayer coatings. A critical film thickness ratio which delivers similar coating limits as those for single-layer coatings was derived and confirmed by experimentally gained results. Note de contenu : - Calculation of the single-layer coating bead pressure
- Calculation of the bilayer coating bead pressureDOI : 10.1007/s11998-015-9701-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9701-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24688
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Code-barres Cote Support Localisation Section Disponibilité 17467 - Périodique Bibliothèque principale Documentaires Disponible CFD model of slot die coating for lithium-ion battery electrodes in 2D and 3D with load balanced dynamic mesh refinement enabled with a local-slip boundary condition in OpenFOAM / Alexander Hoffmann in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 1 (01/2023)
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Titre : CFD model of slot die coating for lithium-ion battery electrodes in 2D and 3D with load balanced dynamic mesh refinement enabled with a local-slip boundary condition in OpenFOAM Type de document : texte imprimé Auteurs : Alexander Hoffmann, Auteur ; Sandro Spiegel, Auteur ; Thilo Heckmann, Auteur ; Philip Scharfer, Auteur ; Wilhelm Schabel, Auteur Année de publication : 2023 Article en page(s) : p. 3-14 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Accumulateurs lithium-ion
Electrodes
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Mécanique des fluides numériquesLa mécanique des fluides numérique (MFN), plus souvent désignée par le terme anglais computational fluid dynamics (CFD), consiste à étudier les mouvements d'un fluide, ou leurs effets, par la résolution numérique des équations régissant le fluide. En fonction des approximations choisies, qui sont en général le résultat d'un compromis en termes de besoins de représentation physique par rapport aux ressources de calcul ou de modélisation disponibles, les équations résolues peuvent être les équations d'Euler, les équations de Navier-Stokes, etc.
La CFD a grandi d'une curiosité mathématique pour devenir un outil essentiel dans pratiquement toutes les branches de la dynamique des fluides, de la propulsion aérospatiale aux prédictions météorologiques en passant par le dessin des coques de bateaux. Dans le domaine de la recherche, cette approche est l'objet d'un effort important, car elle permet l'accès à toutes les informations instantanées (vitesse, pression, concentration) pour chaque point du domaine de calcul, pour un coût global généralement modique par rapport aux expériences correspondantes.
Domaines d'application : La CFD est particulièrement employée dans les domaines des transports, pour étudier notamment le comportement aérodynamique des véhicules (automobile, aéronautique, etc) conçus.
La CFD est également utilisée dans le domaine des installations critiques telles que les salles de serveurs. Elle permet de réaliser une représentation 3D de la salle, comprenant toutes les informations relatives aux équipements informatiques, électriques et mécaniques. On obtient une carte graduée des différentes zones de chaleur présentes, ce qui permet de détecter les zones critiques et les points chauds (ou "hot spots").
RevêtementsIndex. décimale : 667.9 Revêtements et enduits Résumé : Slot die coating is a state-of-the-art process to manufacture lithium-ion battery electrodes with high accuracy and reproducibility, covering a wide range of process conditions and material systems. Common approaches to predict process windows are one-dimensional calculations with a limited expressiveness. A more detailed analysis can be performed using CFD simulations, which are often based on in-house code or closed-source software. In this study, a two-phase CFD model in two and three dimensions was created in OpenFOAM with the intent to provide a method for more detailed investigations of the slot die coating process with open access to source code and files. A custom boundary condition enables the proper description of the wetting behavior in the two-dimensional model. The combination of standard no-slip boundary conditions at the substrate boundary with the volume-of-fluid solution algorithm leads to a method-related air entrainment, which was prevented by allowing local slip at the dynamic wetting line at the upstream meniscus in the two-dimensional model. Additionally, a load-balancing dynamic refinement algorithm was implemented to minimize the computational effort and increase the ease of use of the simulation environment. The simulation was validated by comparing the simulated process limits to experimental observations, showing good agreement. As a result, this model enables detailed analyses regarding the influences of slot die geometries, material properties, and process parameters on the coating stability and wet-film profile. Note de contenu : - EXPERIMENTAL MATERIALS AND METHODS : Material properties - Numerical methods
- RESULTS AND DISCUSSION : 2D-model
- Table 1 : Dry composition of the anode slurry used in this study
- Table 2 : Patch names and assigned boundary conditions for the two-dimensional numerical simulations
- Table 3 : Patch names and assigned boundary conditions for the three-dimensional numerical simulations
- Table 4 : Computational effort for different mesh resolutions and refinement methodsDOI : https://doi.org/10.1007/s11998-022-00660-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00660-8.pdf?pdf=button Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38777
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Code-barres Cote Support Localisation Section Disponibilité 23928 - Périodique Bibliothèque principale Documentaires Disponible A computational study of the effect of particle migration on the low-flow limit in slot coating of particle suspensions / Ivan R. Siqueira in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 6 (11/2019)
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Titre : A computational study of the effect of particle migration on the low-flow limit in slot coating of particle suspensions Type de document : texte imprimé Auteurs : Ivan R. Siqueira, Auteur ; Marcio S. Carvalho, Auteur Année de publication : 2019 Article en page(s) : p. 1619-1628 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dispersions et suspensions
Eléments finis, Méthode des
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Particules (matières) -- Migration
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Slot coating of particle suspensions is commonly used in the manufacturing of a wide variety of products. An important limit in this process is known as low-flow limit, which refers to the minimum wet film thickness that can be coated at a given substrate velocity. Recent studies have shown that shear-induced particle migration leads to a highly non-uniform particle distribution in the coating bead, playing an important role in the flow dynamics in slot coating of particulate systems. In this work, we extend the previous analyses to investigate the effects of particle migration on the low-flow limit in slot coating of particle suspensions at both dilute and concentrated conditions. As a first approximation, the suspension is modeled as a Newtonian liquid with a concentration-dependent viscosity, and shear-induced particle migration is described according to the diffusive flux model. The resulting set of governing equations is solved with a stabilized finite element method coupled with the elliptic mesh generation method for the free-boundary problem. The results show that particle migration changes the liquid viscosity near the downstream meniscus and strongly affects the force balance that sets the critical operating conditions at the low-flow limit. Remarkably, it was found that particle migration enlarges the operating window of the process when the suspensions are compared to a Newtonian liquid with the same bulk properties, especially at high concentrations. Note de contenu : - MATHEMATICAL MODELING : Conservation equations - Shear-induced particle migration - Dimensionless numbers
- COMPUTATIONAL SOLUTIONDOI : 10.1007/s11998-019-00196-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00196-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33414
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Code-barres Cote Support Localisation Section Disponibilité 21321 - Périodique Bibliothèque principale Documentaires Disponible Effect of shim configuration on flow dynamics and operability windows in stripe slot coating process / Gui Hua Han in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 1 (01/2014)
PermalinkEffect of sloped die lip geometry on the operability window in slot coating flows using viscocapillary and two-dimensional models / Si Hyung Lee in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 1 (01/2014)
PermalinkEffect of upstream meniscus shape on dynamic wetting and operating limits of Newtonian coating liquids in slot coating bead flows / Won-Gi Ahn in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
PermalinkExtrusion de fluide newtonien en sortie de filières annulaires axissymétriques. Simulation numérique par la méthode des tubes de courant / Magdeleine Normandin in LES CAHIERS DE RHEOLOGIE, Vol. XVI, N° 4 (05/2000)
PermalinkFluid-dynamic properties and wetting behavior of coating inks for roll-to-roll production of polymer-based solar cells in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 1 (01/2014)
PermalinkHigh-speed slot-die coating of primer layers for Li-ion battery electrodes : model calculations and experimental validation of the extended coating window depending on coating speed, coating gap and viscosity / Sandro Spiegel in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 2 (03/2024)
PermalinkHomogeneity analysis of square meter-sized electrodes for PEM electrolysis and PEM fuel cells / Andrea Burdzik in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)
PermalinkInvestigation of edge formation during the coating process of Li-ion battery electrodes / Sandro Spiegel in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)
PermalinkLiquid film coating of small molecule OLEDs / Katharina Peters in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 1 (01/2014)
PermalinkMultilayer OLEDs with four slot die-coated layers / Lisa Merklein in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 6 (11/2019)
PermalinkNumerical analysis for predicting the operability window of slot-die coating onto porous media / Tomomi Goda in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 5 (09/2017)
PermalinkNumerical analysis of pulsatile flows in a slot-die manifold / Heechan Jung in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 4 (07/2019)
PermalinkNumerical and experimental investigation on formation of the film for different die lip configurations in lithium-ion battery electrode slot-die coating / Xiaosong Gong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 2 (03/2024)
PermalinkNumerical investigation of multiple-slot jets in air-knife wiping / A. Yahyaee Soufiani in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 5 (09/2017)
PermalinkOperability limits for non-Newtonian liquids in dual-layer slot coating processes using the viscocapillary model / Jin Seok Park in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)
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