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Coating versus Doping: Understanding the Enhanced Performance of High‐Voltage Batteries by the Coating of Spinel LiNi$_{0.5}$Mn$_{1.5}$O$_4$ with Li$_{0.35}$La$_{0.55}$TiO$_3$

Mereacre, Valeriu 1; Stüble, Pirmin 1; Trouillet, Vanessa 1,2; Ahmed, Shamail; Volz, Kerstin; Binder, Joachim R. 1
1 Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS), Karlsruher Institut für Technologie (KIT)
2 Karlsruhe Nano Micro Facility (KNMF), Karlsruher Institut für Technologie (KIT)

Abstract:

Li$_{0.35}$La$_{0.55}$TiO$_3$ (LLTO) coated spinel LiNi$_{0.5}$Mn$_{1.5}$O$_4$ (LNMO) as cathode material is fabricated by a new method using hydrogen-peroxide as activating agent. The structure of the obtained active materials is investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), and the electrochemical properties of the prepared cathodes are probed by the charge–discharge studies. The morphology of the coating material on the surface and the degree of coverage of the coated particles is investigated by the SEM, which shows a fully dense and homogeneous coating (thickness ≈ 7 nm, determined by TEM) on the surface of active material. XRD studies of the coated active materials treated at different temperatures (between 300 °C and 1000 °C) reveal expansion or contraction of the unit cell in dependence of the coating concentration and degree of Ti diffusion. It is concluded, that for the LNMO particles calcined at low temperatures, the LLTO coating layer is still intact and protects the active material from the interaction with the electrolyte. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000153799
Veröffentlicht am 16.12.2022
Originalveröffentlichung
DOI: 10.1002/admi.202201324
Scopus
Zitationen: 7
Web of Science
Zitationen: 5
Dimensions
Zitationen: 7
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 2196-7350
KITopen-ID: 1000153799
HGF-Programm 38.02.02 (POF IV, LK 01) Components and Cells
Erschienen in Advanced Materials Interfaces
Verlag John Wiley and Sons
Band 10
Heft 2
Seiten Art.-Nr.: 2201324
Vorab online veröffentlicht am 29.11.2022
Schlagwörter cathode materials, electrochemical properties, Li 0.35La 0.55TiO 3 (LLTO), lithium-ion batteries, X-ray diffraction
Nachgewiesen in Web of Science
Dimensions
Scopus
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