KIT | KIT-Bibliothek | Impressum | Datenschutz

Lithium-ion (de)intercalation mechanism in core-shell layered Li(Ni,Co,Mn)O2 cathode materials

Hua, W.; Schwarz, B.; Azmi, R.; Müller, M.; Dewi Darma, M. S.; Knapp, M.; Senyshyn, A.; Heere, M.; Missyul, A.; Simonelli, L.; Binder, J. R.; Indris, S.; Ehrenberg, H.

LiNi$_{x}$CoyMn$_{1-x-y}$O$_{2}$ (NCM) intercalation compounds with core-shell architecture have been found to be promising cathode candidates for next-generation lithium-ion battery applications. The NCM cathodes' functional properties are dependent on the transition metal relative ratios, making it a challenge to control the real structure of core-shell NCM cathode materials and to understand the synergistic effect of core and shell during the electrochemical cycling. Herein, a universal and facile synthetic strategy is developed to synthesize the NCM material composed of an inner Ni-rich core and a Mn-rich shell on a secondary particle level. Both the Ni-rich particle core and the Mn-rich outer surface possess a layered α–NaFeO$_{2}$–type structure with the same space group (R3m). The in situ synchrotron-based X-ray diffraction and absorption spectroscopy results demonstrate that the two layered phases do not participate in the electrochemical reaction simultaneously during the first cycle between 2.7 and 4.3 V, while they exhibit a similar reversible (de)lithiation mechanism in the following cycles. These findings provide a new perspective for rational design of layered Ni-based cathode materials with high energy and long cycling life with particular two phase electrochemical characteristics.

Open Access Logo

Verlagsausgabe §
DOI: 10.5445/IR/1000123593
Veröffentlicht am 27.09.2020
DOI: 10.1016/j.nanoen.2020.105231
Zitationen: 10
Zitationen: 10
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Energiespeichersysteme (IAM-ESS)
Institut für Nachrichtentechnik - Communications Engineering Lab (CEL)
Young Investigator Network (YIN)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2020
Sprache Englisch
Identifikator ISSN: 2211-2855, 2211-3282
KITopen-ID: 1000123593
HGF-Programm 37.01.12 (POF III, LK 01) Intercalation
Erschienen in Nano energy
Band 78
Seiten Art. Nr.: 105231
Schlagwörter Core-shell architecture, Coexisting layered phases, Chemical composition, (de)Lithiation mechanism
Nachgewiesen in Scopus
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
KITopen Landing Page