NDLI: An experimental and analytical study on intermittent slot die coating of viscoelastic battery slurries

Content Provider	Springer Nature Link
Author	Schmitt, Marcel Diehm, Ralf Scharfer, Philip Schabel, Wilhelm
Copyright Year	2015
Abstract	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.
Starting Page	927
Ending Page	938
Page Count	12
File Format	PDF
ISSN	15470091
Journal	JCT Research
Volume Number	12
Issue Number	5
e-ISSN	19353804
Language	English
Publisher	Springer US
Publisher Date	2015-07-30
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Slot die coating Intermittent coating Viscoelastic fluid Non-Newtonian fluid Lithium-ion batteries Tribology, Corrosion and Coatings Surfaces and Interfaces, Thin Films Polymer Sciences Industrial Chemistry/Chemical Engineering Materials Science
Content Type	Text
Resource Type	Article
Subject	Chemistry Surfaces, Coatings and Films Colloid and Surface Chemistry Surfaces and Interfaces

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