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Effect of Polymeric Binders on Dispersion of Active Particles in Aqueous LiFePO$_{4}$-Based Cathode Slurries as well as on Mechanical and Electrical Properties of Corresponding Dry Layers

Gordon, Ronald; Kassar, Meriem; Willenbacher, Norbert

Abstract:
We investigated the effect of carboxymethyl cellulose (CMC) and the particulate fluorine/acrylate hybrid polymer (FAHP) on the flow behavior of LiFePO$_{4}$-based cathode slurries as well as on electrical and mechanical properties of the corresponding dry layers. CMC dissolves in water and partly adsorbs on the active particles. Thus, it has a strong impact on particle dispersion and a critical CMC concentration distinguished by a minimum in yield stress and high shear viscosity is found, indicating an optimum state of particle dispersion. In contrast, the nanoparticulate FAHP binder has no effect on slurry rheology. The electrical conductivity of the dry layer exhibits a maximum at a CMC concentration corresponding to the minimum in slurry viscosity but monotonically decreases with increasing FAHP concentration. Adhesion to the current collector is provided by FAHP, and the line load in peel tests strongly increases with FAHP concentration, whereas CMC does not contribute to adhesion. The electrical conductivity and adhesion values obtained here excel reported values for similar aqueous LiFePO$_{4}$-based cathode layers using alternative polymeric binders. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000120626
Veröffentlicht am 26.06.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mechanische Verfahrenstechnik und Mechanik (MVM)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 05.2020
Sprache Englisch
Identifikator ISSN: 2470-1343, 2470-1343
KITopen-ID: 1000120626
Erschienen in ACS omega
Band 5
Heft 20
Seiten 11455–11465
Vorab online veröffentlicht am 14.05.2020
Nachgewiesen in Scopus
Web of Science
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