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Slot die coating of lithium-ion battery electrodes : investigations on edge effect issues for stripe and pattern coatings / Marcel Schmitt in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 1 (01/2014)
[article]
Titre : Slot die coating of lithium-ion battery electrodes : investigations on edge effect issues for stripe and pattern coatings Type de document : texte imprimé Auteurs : Marcel Schmitt, Auteur ; Philip Scharfer, Auteur ; Wilhelm Schabel, Auteur Année de publication : 2014 Article en page(s) : p. 57-63 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Accumulateurs lithium-ion
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RevêtementsIndex. décimale : 667.9 Revêtements et enduits Résumé : An important step in the production of lithium-ion batteries is the coating of electrodes onto conducting foils. The most frequently used coating method in industry is slot die coating. This process allows the reproducible preparation of thin functional films at high velocities. A phenomenon that is often neglected in scientific studies and has attracted little attention, compared to film stability, is the inevitable presence of edge effects. Film elevations appear at the coating edges and at the start of each single patch during intermittent coating. These superelevations will cause problems at the downstream cell-assembling steps. In this study the influence of dynamic and geometric coating parameters on the shaping of coating edge effects was investigated. A quantitative measurement technique for edge profiles was developed and implemented. Film stretching has been identified in literature as a main reason for edge effects. We could show that varying the coating speed and the gap ratio did not lead to ideal edges, but affected the shape of the coating edges. The elevation height appeared to be independent from the varied process parameters, in the range of investigation. Also the gradient at the very edge of the film was not affected by these parameters. Only the edge width showed a disproportionately increasing trend towards higher applied gap ratios. The results indicate that the approach of film stretching is not sufficient to fully describe the cause of superelevations in lithium-ion battery coatings. DOI : 10.1007/s11998-013-9498-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9498-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20616
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Code-barres Cote Support Localisation Section Disponibilité 16023 - Périodique Bibliothèque principale Documentaires Disponible Slot die stripe coating of low viscous fluids / Sebastian M. Raupp in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Slot die stripe coating of low viscous fluids Type de document : texte imprimé Auteurs : Sebastian M. Raupp, Auteur ; Marcel Schmitt, Auteur ; Anna-Lena Walz ; Ralf Diehm ; Helga Hummel ; Philip Scharfer ; Wilhelm Schabel Année de publication : 2018 Article en page(s) : p. 899-911 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Enduction par filière Tags : 'Enduit de filière' 'Revêtement à rayures' 'Fenêtre processus' 'Epaisseur minimale du film' 'Limite supérieure' 'Liquides peu visqueux' 'Modèle pour l'épandage Index. décimale : 667.9 Revêtements et enduits Résumé : Slot die coating is applied to deposit thin and homogenous films in roll-to-roll and sheet-to-sheet applications. The critical step in operation is to choose suitable process parameters within the process window. In this work, we investigate an upper limit for stripe coatings. This maximum film thickness is characterized by stripe merging which needs to be avoided in a stable process. It is shown that the upper limit reduces the process window for stripe coatings to a major extent. As a result, stripe coatings at large coating gaps and low viscosities are only possible for relatively thick films. Explaining the upper limit, a theory of balancing the side pressure in the gap region in the cross-web direction has been developed. Note de contenu : - Determination of process window
- Finally, the following observations for strippe coatings can be stated
- A first theoretical approach to explain the experimental findings and an upper limit for stripe coatings
- Upper limit and maximum hwet film thickness calculationsDOI : 10.1007/s11998-017-0039-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0039-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31115
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Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Steering and in situ monitoring of drying phenomena during film fabrication / Fabien Scheepers in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)
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Titre : Steering and in situ monitoring of drying phenomena during film fabrication Type de document : texte imprimé Auteurs : Fabien Scheepers, Auteur ; Andrea Stähler, Auteur ; Markus Stähler, Auteur ; Marcelo Carmo, Auteur ; Werner Lehnert, Auteur ; Detlef Stolten, Auteur Année de publication : 2019 Article en page(s) : p. 1213-1221 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites à fibres de verre
Electrodes
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Polytétrafluoréthylène
Revêtements -- Défauts
Revêtements -- Fissuration
Revêtements organiques
Tension superficielleIndex. décimale : 667.9 Revêtements et enduits Résumé : During film fabrication, the phenomena of crack formation and delamination are often observed, dramatically hindering the discovery and characterization of new materials for energy applications. In this work, we report on a novel approach to fully steer the drying parameters or “knobs” that are commonly used during electrode manufacture. It allows us to precisely in situ control and monitor the solvent-specific evaporation rates that affect the development of suspension composition during drying. We managed to control the capillary stress inside the layer by precisely controlling the selectivity of solvent evaporation. Large cracks result when the surface tension increases over time and layer delamination occurs. When using an n-propanol/water system, critical crack formation is achieved when water is enriched by decreasing the gas exchange during drying or preloading the gas phase with water vapor. High gas exchange rates inhibit the water’s enrichment, and therefore, only small surface cracks develop. The experiments also surprisingly indicate that the drying temperature has no significant effect on crack formation. These results are of fundamental meaning for the future development of electrodes as the drying step has a high impact on the products specification and now can be ultimately controlled. The future development of electrodes will surely benefit from this achievement in the controlled fabrication of films for a variety of applications. Note de contenu : - EXPERIMENTAL : Principle - Slot die coating - Drying test station
- RESULTS AND DISCUSSION : Variation in suspension composition/concentration - Variation in drying parametersDOI : 10.1007/s11998-019-00206-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00206-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33004
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Code-barres Cote Support Localisation Section Disponibilité 21154 - Périodique Bibliothèque principale Documentaires Disponible Trailing edge formation during slot coating of rectangular patches / D. Maza in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 5 (09/2017)
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Titre : Trailing edge formation during slot coating of rectangular patches Type de document : texte imprimé Auteurs : D. Maza, Auteur ; M. S. Carvalho, Auteur Année de publication : 2017 Article en page(s) : p. 1003-1013 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Eléments finis, Méthode des
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Ligne de contact (chimie physique)(Chimie physique) Ligne correspondant à l’intersection apparente de deux interfaces contigües.
Médicaments -- Administration par timbres
Modèles mathématiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Different products, such as adhesives, pharmaceutical patches, batteries, and fuel cell membranes, require coating discrete patches onto moving substrates. For coating rectangular patches, intermittent slot die coating is the preferred method. The patches can be obtained by rapidly starting and stopping the flow out of the coating die. Controlling the flow start-up and shutdown to produce sharp and uniform leading and trailing edges of each patch is challenging. Different ways to control the liquid feeding are used to optimize the process. Even if the start-up and shutdown of the feeding system are well designed, the transient flow in the coating bead contributes to the formation of nonuniform leading and trailing edges of coated patches. In this work, we analyze how the operating conditions, die geometry, and liquid properties affect the coating bead breakup process and the trailing edge configuration. The process is directly related to the contact line dynamics. The results show that the uniformity of the trailing edge of each coated patch can be improved by changing the die shoulder angle and wetting characteristics of the die surface. DOI : 10.1007/s11998-017-9962-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9962-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29136
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Code-barres Cote Support Localisation Section Disponibilité 19230 - Périodique Bibliothèque principale Documentaires Disponible Transient response of slot coating flows of shear-thinning fluids to periodic disturbances / Semi Lee in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 5 (09/2017)
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Titre : Transient response of slot coating flows of shear-thinning fluids to periodic disturbances Type de document : texte imprimé Auteurs : Semi Lee, Auteur ; Jaewook Nam, Auteur Année de publication : 2017 Article en page(s) : p. 981-990 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cisaillement (mécanique)
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Fluide de CarreauLe fluide de carreau est un type de fluide newtonien généralisé où la viscosité, dépend du taux de cisaillement.
RhéologieIndex. décimale : 667.9 Revêtements et enduits Résumé : Slot coating is a popular coating method, in which the film thickness is precisely controlled by adjusting the flow rate and production speed. When the coating flow undergoes small-scale disturbances generated by rotating elements such as motors, pumps, or uneven rolls, the downstream meniscus fluctuates, which causes film thickness variation in the flow direction. Although most coating liquids including polymeric and particulate solutions exhibit a shear-thinning rheological property, their effect on transient coating flow behaviors is not deeply understood. Here, the effect of shear-thinning property on film thickness variation under different disturbances is investigated using a computer-aided analysis of transient slot coating flow. In this study, the Carreau model is used to describe the shear-thinning property, and four different disturbances are considered. Note de contenu : - Governing equations and boundary conditions
- Material properties and operating conditions
- Results and discussion : Disturbance strongly sensitive to the shear-thinning property : the coating gap - Disturbance weakly sensitive to the shear-thinning property
- Final remarks
- Appendix : Development of the parabolic velocity profile for carreau fluids - Dependence of film thickness variation on the upstream bead size under vacuum disturbanceDOI : 10.1007/s11998-017-9952-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9952-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29127
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Code-barres Cote Support Localisation Section Disponibilité 19230 - Périodique Bibliothèque principale Documentaires Disponible Wetting behavior of the shear thinning power law fluids / Sima Didari in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 1 (01/2014)
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