![](./images/home.jpg)
![](./images/bar_spacer.gif)
Détail de l'auteur
Auteur Ralf Diehm |
Documents disponibles écrits par cet auteur
![](./images/expand_all.gif)
![](./images/collapse_all.gif)
![](./images/orderby_az.gif)
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
Enduction par filière
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
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 5 (09/2015) . - p. 927-938[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 17467 - Périodique Bibliothèque principale Documentaires Disponible Investigation 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)
![]()
[article]
Titre : Investigation of edge formation during the coating process of Li-ion battery electrodes Type de document : texte imprimé Auteurs : Sandro Spiegel, Auteur ; Thilo Heckmann, Auteur ; Andreas Altvater, Auteur ; Ralf Diehm, Auteur ; Philip Scharfer, Auteur ; Wilhelm Schabel, Auteur Année de publication : 2022 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Accumulateurs lithium-ion
Caractérisation
Electrodes
Enduction par filière
Enrobage (technologie)
Formulation (Génie chimique)
MélangeIndex. décimale : 667.9 Revêtements et enduits Résumé : In this manuscript, a method to reduce superelevations of lateral edges in cross-web direction during slot die coating of shear-thinning slurries for Li-ion battery electrodes (LIB) was developed. Therefore, the impact of the inner slot die geometry on the edge elevations was investigated. These elevations of the coating could be almost eliminated by optimizing the flow profile at the outlet of the slot die by modification of the internal geometry. This adaption is an essential step in optimizing the coating quality of slot die coating for battery electrodes to significantly reduce coating edges and, hence, the resulting production reject during the coating step of the industrial roll-to-roll process. It was also shown that lateral edges of the coating can be influenced explicitly by process parameters such as volume flow and gap between slot die and substrate. This correlation has already been shown for other shear-thinning material systems in previous works, which is now confirmed for this material system. At the beginning, the influence of different internal geometries on the formation of the edge elevations was shown. Finally, for the shear-thinning electrode slurry used in this work, optimal dimensions of the previously determined inner geometry for the slot die outlet were found. The optimization was performed for a state-of-the-art electrode area capacity (approximately 2.2 mAh cm−2). The results enable a significant reduction of defects and reject in the coating step of large-scale production of LIB electrodes in the future, adding to a more sustainable battery production. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Formulation, mixing, and preparation - Experimental setup and process parameters - Characterization methods
- RESULTS AND DISCUSSION : Influence of coating speed - Influence of dimensionless gap - Influence of shim geometries
- Table 1 Composition of the solid components of the anode slurry
- Table 2 Process parameters and geometrical parameters used in the experiments for the different shim configurationsDOI : https://doi.org/10.1007/s11998-021-00521-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00521-w.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37150
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022)[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 23313 - 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
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 899-911[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible