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Visualization of Light Elements using 4D STEM: The Layered‐to‐Rock Salt Phase Transition in LiNiO2 Cathode Material

Ahmed, Shamail; Bianchini, Matteo; Pokle, Anuj; Munde, Manveer Singh; Hartmann, Pascal; Brezesinski, Torsten; Beyer, Andreas; Janek, Jürgen; Volz, Kerstin

The layered oxide LiNiO2 (LNO) has been extensively investigated as a cathode active material for lithium‐ion batteries. Despite LNO's high gravimetric capacity, instability issues hinder its commercialization. It suffers from capacity loss during electrochemical cycling and is difficult to synthesize without defects. This is related to poor structural stability, leading to decomposition into the parent rock‐salt‐type oxide. In order to understand such phase transformations and to develop measures to inhibit them, the development of techniques able to image all atoms is crucial. In this study, the use of a fast, pixelated detector and 4D imaging in scanning transmission electron microscopy are explored to tackle this challenge. Selecting specific angular regions in the diffraction patterns and calculating virtual annular bright‐field images significantly enhances the contrast of the lithium atoms, such that all atoms are visible even in realistic samples. The developed technique is applied to image the layered‐to‐rock salt phase transition region. The data show that in this region, nickel atoms are in tetrahedral positions and the oxygen atoms are asymmetrically distributed. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000120254
Veröffentlicht am 17.06.2020
DOI: 10.1002/aenm.202001026
Zitationen: 11
Web of Science
Zitationen: 8
Zitationen: 11
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1614-6832, 1614-6840
KITopen-ID: 1000120254
HGF-Programm 37.01.01 (POF III, LK 01) Fundamentals and Materials
Erschienen in Advanced energy materials
Verlag Wiley-VCH Verlag
Band 10
Heft 25
Seiten Art.Nr. 2001026
Vorab online veröffentlicht am 25.05.2020
Nachgewiesen in Dimensions
Web of Science
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