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Improved Capacity Retention of SiO$_{2}$-Coated LiNi$_{0.6}$Mn$_{0.2}$Co$_{0.2}$O$_{2}$ Cathode Material for Lithium-Ion Batteries

Lu, Xiaoxue; Zhang, Ningxin; Jahn, Marcus; Pfleging, Wilhelm; Seifert, Hans J.

Surface degradation of Ni-enriched layered cathode material Li[Ni0.6Mn0.2Co0.2]O2
(NMC622) is the main reason that leads to large capacity decay during long-term cycling. In the frame of this research, an amorphous SiO2 coating was applied onto the surface of the commercially available NMC622 powder by a wet coating process, through the condensation reaction of tetraethylorthosilicate. The chemical composition of the coating layer was analyzed by inductively-coupled plasma. The morphology was studied by scanning electron microscopy and transmission electron microscopy. Electrochemical properties, including cyclic voltammetry, galvanostatic cycling, and rate capability measurements in a half-cell configuration, were tested to compare the electrochemical
behavior of the non-coated and coated NMC622 materials. It is shown that the rate performance of the NMC622 materials is not aected by the coating layer. After 700 cycles in the range of 3.0–4.3 V at 2 C discharge, the cells with SiO2-coated NMC622 materials retained 80% of their initial capacity, which is higher than the uncoated ones (74%). Physicochemical characterizations, e.g., XRD and SEM, were performed post-mortem to reveal the stabilizing mechanism of the SiO2-coated NMC622 electrodes after long-term cycling. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000099594
Veröffentlicht am 05.11.2019
DOI: 10.3390/app9183671
Zitationen: 5
Web of Science
Zitationen: 5
Zitationen: 7
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Karlsruhe Nano Micro Facility (KNMF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2019
Sprache Englisch
Identifikator ISSN: 2076-3417
KITopen-ID: 1000099594
HGF-Programm 37.01.02 (POF III, LK 01) Components and Cells
Erschienen in Applied Sciences
Verlag MDPI
Band 9
Heft 18
Seiten 3671
Vorab online veröffentlicht am 05.09.2019
Schlagwörter lithium-ion battery; Ni-rich layered cathode material; SiO2 coating; capacity retention; KNMF 2019-023-028069 LMP;
Nachgewiesen in Web of Science
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