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Dry Electrode Manufacturing in a Calender: The Role of Powder Premixing for Electrode Quality and Electrochemical Performance

Gyulai, Andreas ORCID iD icon 1; Bauer, Werner ORCID iD icon 2; Ehrenberg, Helmut 2
1 Institut für Angewandte Materialien (IAM), Karlsruher Institut für Technologie (KIT)
2 Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS), Karlsruher Institut für Technologie (KIT)

Abstract:

The dry manufacturing of battery electrodes has the potential to significantly reduce costs and the environmental impact of battery production but deteriorates the electrode quality due to drawbacks in the processability of the materials. By varying the mixing intensity of the powder mixtures, this work investigates the impact of blend homogeneity on the flow properties and the processability of the dry mixtures. Furthermore, the electrochemical performance of dry laminated electrodes made of LiNi0.6Mn0.2Co0.2O2 is investigated with respect to their initial mixture homogeneities and compared to slurry-based electrodes. An improvement of the powder flowability is observed for mixtures with a homogeneously distributed PVDF binder, which acts as a temporary lubricant in dry electrode manufacturing due to its ability to shear, resulting also in filament formation. Capacity and rate performance of electrodes made of homogeneous mixtures are the highest with 169 mAh/g at C/20 and 70 mAh/g at 3C compared to 169 and 49 mAh/g for the slurry-based electrodes, respectively. Cyclic voltammetry indicates lower overpotentials for incompletely homogenized electrodes due to the existence of carbon black aggregates that establish better long-range conductivity. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000159894
Veröffentlicht am 27.06.2023
Originalveröffentlichung
DOI: 10.1021/acsaem.2c03755
Scopus
Zitationen: 11
Web of Science
Zitationen: 12
Dimensions
Zitationen: 13
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 22.05.2023
Sprache Englisch
Identifikator ISSN: 2574-0962
KITopen-ID: 1000159894
HGF-Programm 38.02.02 (POF IV, LK 01) Components and Cells
Erschienen in ACS Applied Energy Materials
Verlag American Chemical Society (ACS)
Band 6
Heft 10
Seiten 5122–5134
Vorab online veröffentlicht am 05.05.2023
Schlagwörter lithium-ion cathode; calendering; roll milling; solvent free; powder mixing; powder rheology
Nachgewiesen in Scopus
Dimensions
Web of Science
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