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Hierarchical Structuring of NMC111-Cathode Materials in Lithium-Ion Batteries: An In-Depth Study on the Influence of Primary and Secondary Particle Sizes on Electrochemical Performance

Wagner, Amalia Christina; Bohn, Nicole; Geßwein, Holger; Neumann, Matthias; Osenberg, Markus; Hilger, André; Manke, Ingo; Schmidt, Volker; Binder, Joachim R.

Commercially used LiNi1/3Mn1/3Co1/3O2 (NMC111) in lithium-ion batteries mainly consists of a large-grained nonporous active material powder prepared by coprecipitation. However, nanomaterials are known to have extreme influence on gravimetric energy density and rate performance but are not used at the industrial scale because of their reactivity, low tap density, and diminished volumetric energy density. To overcome these problems, the build-up of hierarchically structured active materials and electrodes consisting of microsized secondary particles with a primary particle scale in the nanometer range is preferable. In this paper, the preparation and detailed characterization of porous hierarchically structured active materials with two different median secondary particle sizes, namely, 9 and 37 mu m, and primary particle sizes in the range 300-1200 nm are presented. Electrochemical investigations by means of rate performance tests show that hierarchically structured electrodes provide higher specific capacities than conventional NMC111, and the cell performance can be tuned by adjustment of processing parameters. In particular, electrodes of coarse granules sintered at 850 degrees C demonstrate more favorable transport parameters because of electrode build-up, that is, the morphology of the system of active material particles in the electrode, and demonstrate superior discharge capacity. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000128281
Veröffentlicht am 11.01.2021
DOI: 10.1021/acsaem.0c02494
Zitationen: 3
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Energiespeichersysteme (IAM-ESS)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 28.12.2020
Sprache Englisch
Identifikator ISSN: 2574-0962, 2574-0962
KITopen-ID: 1000128281
HGF-Programm 37.01.12 (POF III, LK 01) Intercalation
Erschienen in ACS applied energy materials
Verlag American Chemical Society (ACS)
Band 3
Heft 12
Seiten 12565–12574
Vorab online veröffentlicht am 11.12.2020
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