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Numerical 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)
Titre : Numerical and experimental investigation on formation of the film for different die lip configurations in lithium-ion battery electrode slot-die coating Type de document : texte imprimé Auteurs : Xiaosong Gong, Auteur ; Jie Han, Auteur ; Fei Yan, Auteur ; Xiaozhong Du, Auteur Année de publication : 2024 Article en page(s) : p. 481-492 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Accumulateurs lithium-ion
Bordure -- Défauts
Enduction par filière
Modèles numériques
RevêtementsIndex. décimale : 667.9 Revêtements et enduits Résumé : The slot-die coating is the most commonly used manufacturing method for producing lithium-ion battery electrodes. However, how to achieve high surface consistency for electrodes still confronts one challenge. In this research, the slot coating processes with different die lip configurations were carefully investigated using numerical and experimental methods. The motion pattern, internal flow structure of the coating bead, and coating uniformity were explored during the coating process of lithium battery cathode slurry. The low-flow limit at different coating gaps was also determined by combining the viscous capillary model and numerical methods, which was in good agreement with experimental results. The results showed that a smaller coating gap controlling the upstream meniscus between the upstream die lip and slot exit was favorable to the coating uniformity. For the same thickness films, a larger coating gap was apt to increase formation of edge defects. However, the coating speed had little effect on the edge height. The evolution of flow structure for the coating bead (parabolic-sharp angle-diagonal) under different processes was investigated by tracking the particle trajectories during the coating process. It can provide theoretical guidance for the fabrication of high-quality electrodes. Note de contenu : - NUMERICAL METHOD : Governing equations - Numerical model and boundary conditions - Viscous capillary model
- RESULTS : Low-flow limits at different coating gaps - Wet coating thickness profile and uniformity - Velocity profiles - Coating bead flow structure
- EXPERIMENTAL SETTINGDOI : https://doi.org/10.1007/s11998-023-00874-4 En ligne : https://drive.google.com/file/d/1lmXQq9cyjqEdeit2ZMSyyPTA6ePifA_o/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40771
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 2 (03/2024) . - p. 481-492[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24736 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Reduction in edge beading defects using two-axis spin coating technology : an analytical, numerical, and experimental study Type de document : texte imprimé Auteurs : Soroosh Mahmoodi, Auteur ; David E. Weidner, Auteur Année de publication : 2023 Article en page(s) : p. 1759-1771 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bordure -- Défauts
Gravité
Mouvement rotatoire
Résines photosensibles
Revêtement par centrifugationIndex. décimale : 667.9 Revêtements et enduits Résumé : Spin coating is used by several industries to apply thin but uniform liquid films to a given substrate. While this method produces very uniform coatings over much of the substrate, near the periphery of the substrate, defects in the coating, sometimes referred to as edge beading, often occur. This paper explores the usage of a two-axis spin coating technology that leads to a more uniform film thickness near the edge of the substrate. By rotating the substrate on an axis parallel to the substrate, centrifugal forces are generated that act both normal and parallel to the substrate. These forces are known as elevated gravity and act to even out any existing coating irregularities and also to drain liquid toward the edge of the substrate. This study investigates the effect of elevated gravity on the coating dynamics of a photoresist liquid film on a circular silicon wafer. Using lubrication theory, we derive a modified evolution equation that includes the effects of elevated gravity. We solve this equation numerically using implicit finite differences. Four layers of a photoresist film are spin coated on 3-inch circular wafers using a two-axes spin technology under various elevated gravity conditions. The thickness of the dried coating layers near the periphery of the substrate is measured using a SEM device. Both the experiments and the simulations show that edge beading defects can be substantially reduced for the 500g elevated gravity case compared to the normal 1g gravity case. Note de contenu : - Mathematical model of fluid properties
- Nondimensionalization
- Numerical aspects
- Experimental aspects
- Results : Parameters used in simulation and experiments - Evolution of the coating layer in 1g environment - Evolution of the coating layer due to enhanced gravity effects
- Table 1 : Physiochemical properties of our model photoresist film
- Table 2 : Relationship between the rotation rate and elevated gravityDOI : https://doi.org/10.1007/s11998-023-00779-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00779-2.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39986
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 5 (09/2023) . - p. 1759-1771[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24242 - Périodique Bibliothèque principale Documentaires Disponible
