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Investigation of Structural and Electronic Changes Induced by Postsynthesis Thermal Treatment of LiNiO$_{2}$

Li, Hang 1; Hua, Weibo; Schwarz, Björn ORCID iD icon 1; Etter, Martin; Mangold, Stefan 2; Melinte, Georgian 3; Casati, Nicola Pietro Maria; Ehrenberg, Helmut 1; Indris, Sylvio ORCID iD icon 1
1 Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS), Karlsruher Institut für Technologie (KIT)
2 Institut für Photonenforschung und Synchrotronstrahlung (IPS), Karlsruher Institut für Technologie (KIT)
3 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)

Abstract:

Postsynthesis thermal treatments at various temperatures in air have been applied to LiNiO2, and the induced structural and electronic changes have been uncovered. Except for the familiar decomposition process at higher temperatures, a series of transformations also take place under mild conditions. To identify such subtle changes, ex situ and in situ synchrotron radiation diffraction, ex situ7Li nuclear magnetic resonance spectroscopy, and ex situ measurements of magnetic properties have been performed. We show that the reaction between LiNiO2 and CO2 starts already at a temperature of 200 °C, forming Li1–zNi1+zO2 layers. If the thickness of this layer is well adjusted, the electrochemical performance of LiNO2 can be improved. A cation off-stoichiometry of [Li0.90Ni0.10]NiO2 is identified at 600 °C even before the decomposition occurs. We also investigate the interplay of the reaction between LiNiO2 and CO2 with the decomposition at 700 °C. The changes in the Ni oxidation state and local Li environments are also monitored during the whole process.


Verlagsausgabe §
DOI: 10.5445/IR/1000153937
Veröffentlicht am 19.12.2022
Originalveröffentlichung
DOI: 10.1021/acs.chemmater.2c00995
Scopus
Zitationen: 8
Web of Science
Zitationen: 2
Dimensions
Zitationen: 8
Cover der Publikation
Zugehörige Institution(en) am KIT Center for Electrochemical Energy Storage Ulm & Karlsruhe (CELEST)
Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS)
Helmholtz-Institut Ulm (HIU)
Institut für Nanotechnologie (INT)
Institut für Photonenforschung und Synchrotronstrahlung (IPS)
Karlsruhe Nano Micro Facility (KNMF)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 27.09.2022
Sprache Englisch
Identifikator ISSN: 0897-4756, 1520-5002
KITopen-ID: 1000153937
HGF-Programm 38.01.03 (POF IV, LK 01) Cell Design and Development
Weitere HGF-Programme 56.12.11 (POF IV, LK 01) Materials - Quantum, Complex and Functional
43.35.03 (POF IV, LK 01) Structural and Functional Behavior of Solid State Systems
Erschienen in Chemistry of Materials
Verlag American Chemical Society (ACS)
Band 34
Heft 18
Seiten 8163–8177
Vorab online veröffentlicht am 06.09.2022
Schlagwörter 2022-029-031489 TEM
Nachgewiesen in Scopus
Dimensions
Web of Science
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