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Effect of carboxymethyl cellulose on the flow behavior of lithium-ion battery anode slurries and the electrical as well as mechanical properties of corresponding dry layers

Gordon, Ronald; Orias, Raquel; Willenbacher, Norbert

We present a holistic view on the role of polymeric binders in waterborne LiB anodes, including preparation and processing of wet slurries as well as microstructure, electrical conductivity and mechanical integrity of dry electrode layers. We focus on carboxymethyl cellulose (CMC), with respect to technical application the influence of soft, nano-particulate styrene–butadiene rubber (SBR) as secondary binder is also addressed. We discuss the influence of CMC concentration, molecular weight (M$_{W}$) and degree of substitution (DS) on flow behavior of anode slurries. Rheological data are not only relevant for processing, here we use them to characterize the adsorption of CMC on active material particles and dispersion of these particles in the slurry at technically relevant concentrations. The fraction of CMC adsorbed onto graphite particles increases with increasing M$_{W}$ and decreasing DS. Electrical conductivity increases with M$_{W}$, i.e. with decreasing free polymer deteriorating conductive carbon black pathways. CMC does not contribute to the adhesion of electrode layers, irrespective of M$_{W}$ or DS, technically feasible adhesion is inferred by SBR. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000123011
Veröffentlicht am 06.12.2020
DOI: 10.1007/s10853-020-05122-3
Zitationen: 5
Zitationen: 6
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mechanische Verfahrenstechnik und Mechanik (MVM)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 27.08.2020
Sprache Englisch
Identifikator ISSN: 0022-2461, 1573-4803
KITopen-ID: 1000123011
Erschienen in Journal of materials science
Verlag Springer
Band 55
Heft 33
Seiten 15867–15881
Nachgewiesen in Scopus
Web of Science
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