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Enhancing the Stability of LiNi$_{o.5}$0Mn$_{1.5}$O$_{4}$ by Coating with LiNbO$_{3}$ Solid-State Electrolyte: Novel Chemically Activated Coating Process versus Sol-Gel Method

Mereacre, Valeriu; Stüble, Pirmin; Ghamlouche, Ahmad; Binder, Joachim R.

Abstract:
LiNbO$_{3}$-coated LiNi$_{0.5}$Mn$_{1.5}$O$_{4}$ spinel was fabricated by two methods: using hydrogen-peroxide as activating agent and sol-gel method. The structure of the obtained cathode materials was investigated using a scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and the electrochemical properties of the prepared cathodes were probed by charge-discharge studies. The morphology of the coating material on the surface and the degree of coverage of the coated particles were investigated by SEM, which showed that the surface of LiNi$_{0.5}$Mn$_{1.5}$O$_{4}$ particles is uniformly encapsulated by lithium innovate coating. The influence of the LiNbO3 coating layer on the spinel’s properties was explored, including its effect on the crystal structure and electrochemical performance. XRD studies of the obtained coated active materials revealed very small expansion or contraction of the unit cell. From the capacity retention tests a significant improvement of the electrochemical properties resulted when a novel chemically activated coating process was used. Poorer results, however, were obtained using the sol-gel method. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000130322
Veröffentlicht am 11.03.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Energiespeichersysteme (IAM-ESS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2079-4991
KITopen-ID: 1000130322
Erschienen in Nanomaterials
Verlag MDPI
Band 11
Heft 2
Seiten 1-13
Schlagwörter LiNbO$_{3}$; X-ray diffraction; lithium-ion batteries; cathode materials; electrochemical properties
Nachgewiesen in Scopus
Web of Science
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