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

[Display omitted] •Extrusion-based coating is promising for the fabrication of Li-ion batteries.•Improved homogeneity and negligible binder migration during fast drying procedures.•Significantly reduced energy and materials demands leading to lower costs.•Extended the process window for electrode de...

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Bibliographic Details
Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2020-12, Vol.402, p.125551, Article 125551
Main Authors: Seeba, J., Reuber, S., Heubner, C., Müller-Köhn, A., Wolter, M., Michaelis, A.
Format: Article
Language:English
Subjects:
Coating process
Electrode manufacturing
Extrusion
High-energy
Lithium-ion battery
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Summary:[Display omitted] •Extrusion-based coating is promising for the fabrication of Li-ion batteries.•Improved homogeneity and negligible binder migration during fast drying procedures.•Significantly reduced energy and materials demands leading to lower costs.•Extended the process window for electrode design parameters. 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.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2020.125551