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Structural insights into the formation and voltage degradation of lithium- and manganese-rich layered oxides

Hua, Weibo; Wang, Suning; Knapp, Michael; Leake, Steven J.; Senyshyn, Anatoliy; Richter, Carsten; Yavuz, Murat; Binder, Joachim R.; Grey, Clare P.; Ehrenberg, Helmut; Indris, Sylvio; Schwarz, Björn

Abstract (englisch):
One major challenge in the field of lithium-ion batteries is to understand the degradation mechanism of high-energy lithium- and manganese-rich layered cathode materials. Although they can deliver 30 % excess capacity compared with today’s commercially- used cathodes, the so-called voltage decay has been restricting their practical application. In order to unravel the nature of this phenomenon, we have investigated systematically the structural and compositional dependence of manganese-rich lithium insertion compounds on the lithium content provided during synthesis. Structural, electronic and electrochemical characterizations of LixNi0.2Mn0.6Oy with a wide range of lithium contents (0.00 ≤ x ≤ 1.52, 1.07 ≤ y < 2.4) and an analysis of the complexity in the synthesis pathways of monoclinic-layered Li[Li0.2Ni0.2Mn0.6]O2 oxide provide insight into the underlying processes that cause voltage fading in these cathode materials, i.e. transformation of the lithium-rich layered phase to a lithium-poor spinel phase via an intermediate lithium-containing rock-salt phase with release of lithium/oxygen.

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Verlagsausgabe §
DOI: 10.5445/IR/1000100296
Veröffentlicht am 26.11.2019
DOI: 10.1038/s41467-019-13240-z
Zitationen: 15
Web of Science
Zitationen: 10
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Energiespeichersysteme (IAM-ESS)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2019
Sprache Englisch
Identifikator ISSN: 2041-1723
KITopen-ID: 1000100296
HGF-Programm 37.01.02 (POF III, LK 01)
Components and Cells
Erschienen in Nature Communications
Band 10
Heft 1
Seiten Article No.5365
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 26.11.2019
Nachgewiesen in Scopus
Web of Science
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