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Influence of dry mixing and distribution of conductive additives in cathodes for lithium ion batteries

Bauer, Werner ORCID iD icon 1; Nötzel, Dorit 1; Wenzel, Valentin 2; Nirschl, Hermann 2
1 Institut für Angewandte Materialien – Keramische Werkstoffe und Technologien (IAM-KWT1), Karlsruher Institut für Technologie (KIT)
2 Institut für Mechanische Verfahrenstechnik und Mechanik (MVM), Karlsruher Institut für Technologie (KIT)


Conductive additives, like carbon black or graphite, are essential components of lithium ion batteries due to the limited electrical conductivity of most electrode materials. However, there is still a lack of knowledge about the optimized distribution of these materials within the electrode. A dry mixing process is used in order to prepare a conductive coating by depositing carbon black on the surface of Li(Ni1/3Mn1/3Co1/3)O-2 (NMC) cathode particles. It is demonstrated that this from a theoretically point of view - favorable distribution does not allow the preparation of working electrodes without taking into account the role of the binder. After adding an organic binder to the slurry, the polymer deposits on top of the carbon shell during drying and inhibits the conductive contact between the particles. This can be avoided by a fraction of distributed carbon particles which are associated with the binder phase providing conductive paths through the isolating organic material. It is shown that carbon black and graphite are principally fulfilling this task, but both materials are leading to varying processing behavior and electrode properties. ... mehr

DOI: 10.1016/j.jpowsour.2015.04.081
Zitationen: 149
Web of Science
Zitationen: 138
Zitationen: 144
Zugehörige Institution(en) am KIT Institut für Mechanische Verfahrenstechnik und Mechanik (MVM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2015
Sprache Englisch
Identifikator ISSN: 0378-7753, 1873-2755
KITopen-ID: 1000050609
HGF-Programm 37.01.02 (POF III, LK 01) Components and Cells
Erschienen in Journal of power sources
Verlag Elsevier
Band 288
Seiten 359-367
Nachgewiesen in Web of Science
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