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The LiNiO$_{2}$ Cathode Active Material: A Comprehensive Study of Calcination Conditions and their Correlation with Physicochemical Properties Part II. Morphology

Riewald, Felix ; Kurzhals, Philipp; Bianchini, Matteo 1,2; Sommer, Heino; Janek, Jürgen; Gasteiger, Hubert A.
1 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)
2 Center for Electrochemical Energy Storage Ulm & Karlsruhe (CELEST), Karlsruher Institut für Technologie (KIT)


A better understanding of the cathode active material (CAM) plays a crucial role in the improvement of lithium-ion batteries. We have previously reported the structural properties of the model cathode material LiNiO$_{2}$ (LNO) in dependence of its calcination conditions and found that the deviation from the ideal stoichiometry in LiNiO2 (Ni excess) shows no correlation to the 1st cycle capacity loss. Rather, the morphology of LNO appears to be decisive. As CAM secondary agglomerates fracture during battery operation, the surface area in contact with the electrolyte changes during cycle life. Thus, particle morphology and especially the primary particle size become critical and are analyzed in detail in this report for LNO, using an automated SEM image segmentation method. It is shown that the accessible surface area of the pristine CAM powder measured by physisorption is close to the secondary particle geometric surface area. The interface area between CAM and electrolyte is measured by an in situ capacitance method and approaches a value proportional to the estimated primary particle surface area determined by SEM image analysis after just a few cycles. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000143644
Veröffentlicht am 10.03.2022
DOI: 10.1149/1945-7111/ac4bf3
Zitationen: 21
Web of Science
Zitationen: 18
Zitationen: 23
Cover der Publikation
Zugehörige Institution(en) am KIT Center for Electrochemical Energy Storage Ulm & Karlsruhe (CELEST)
Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 01.02.2022
Sprache Englisch
Identifikator ISSN: 0013-4651, 1945-7111
KITopen-ID: 1000143644
HGF-Programm 38.02.01 (POF IV, LK 01) Fundamentals and Materials
Erschienen in Journal of The Electrochemical Society
Verlag Electrochemical Society
Band 169
Heft 2
Seiten Art.-Nr.: 020529
Nachgewiesen in Scopus
Web of Science
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