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Effect of Nanostructured and Open-Porous Particle Morphology on Electrode Processing and Electrochemical Performance of Li-Ion Batteries

Müller, Marcus; Schneider, Luca; Bohn, Nicole; Binder, Joachim R.; Bauer, Werner

Abstract:
A nanostructured, porous NCM cathode material is investigated regarding its behavior during electrode processing and electrochemical performance. The results are related to the densely packed NCM original material from which the nanostructure has been derived. Chemical composition and structural parameters are not affected by the nanostructuring process; changes are limited to the particle morphology in terms of primary particle size, specific surface area, and porosity. Electrodes containing a porous NCM material deliver lower adhesion strength values when adding identical amounts of PVDF binder. Increasing the binder fraction from four to six parts increases also the adhesion strength to an acceptable level without deteriorating the cell capacity. Despite initially high electrode porosities of 65–70%, electrodes with nanostructured NCM are capable of withstanding calendering to 40% porosity without destroying the porous particles. Full-cell tests with 50 mAh pouch cells and graphite anodes reveal substantially improved C-rate capabilities for the nanostructured material in relation to the commercial original NCM. The advantage increases with increasing C-rate and corresponds to shorter diffusion pathways in nanostructured NCM. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000130239
Veröffentlicht am 04.03.2021
Originalveröffentlichung
DOI: 10.1021/acsaem.0c03187
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Energiespeichersysteme (IAM-ESS)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 02.2021
Sprache Englisch
Identifikator ISSN: 2574-0962, 2574-0962
KITopen-ID: 1000130239
Erschienen in ACS applied energy materials
Verlag American Chemical Society (ACS)
Band 4
Heft 2
Seiten 1993–2003
Vorab online veröffentlicht am 09.02.2021
Schlagwörter Li-ion battery; NCM; particle morphology; pouch cells; capacity fading
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