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Extrusion-based fabrication of electrodes for high-energy Li-ion batteries

 
: Seeba, Jann; Reuber, Sebastian; Heubner, Christian; Müller-Köhn, Axel; Wolter, Mareike; Michaelis, Alexander

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The chemical engineering journal 402 (2020), Art. 125551
ISSN: 1385-8947
ISSN: 0300-9467
ISSN: 0923-0467
ISSN: 0009-2487
ISSN: 1873-3212 (Online)
Bundesministerium für Bildung und Forschung BMBF (Deutschland)
03XP0070A; HiLo
Bundesministerium für Bildung und Forschung BMBF (Deutschland)
03XP0070B; HiLo
English
Journal Article
Fraunhofer IKTS ()
lithium ion battery; coating process; high-energy; extrusion; electrode manufacturing

Abstract
In this work, an effective and facile extrusion-based mixing and coating process for the manufacturing of electrodes for Li-ion batteries is proposed. Following the development of appropriate pastes and basic rheological investigations, promising formulations are dispersed continuously in a twin screw extruder and directly coated on a current collector foil using the example of LiNi0.6Mn0.2Co0.2O2 as cathode material. The impact of the rotational screw speed, residence time and shear stresses are examined by complimentary materials characterization. The electrochemical performance in battery cells, the homogeneity and microstructure of electrodes manufactured by the extrusion process are compared with electrodes fabricated by an established tape-casting process. The extrusion-based fabrication route shows excellent particle dispersion and high coating quality, resulting in excellent electrochemical performance while providing numerous advantages regarding design freedom, material and processing costs as well as facile upscaling and continuous operation potentials. The work shows that the extrusion-based coating process is a highly promising alternative for the efficient production of lithium-ion batteries.

: http://publica.fraunhofer.de/documents/N-596953.html