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Synthesis and Structure Stabilization of Disordered Rock Salt Mn/V-Based Oxyfluorides as Cathode Materials for Li-Ion Batteries

Blumenhofer, Iris; Shirazi Moghadam, Yasaman; El Kharbachi, Abdel ; Hu, Yang; Wang, Kai 1; Fichtner, Maximilian 1
1 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)


The demand for high-performance lithium-ion batteries and thus efficient cathode materials is steadily increasing. In addition to a high energy density and long lifetime, these should also be cost-effective and environmentally benign. Manganese-based materials have particular potential because manganese is available in sufficient quantities and can be supplied at a comparatively low cost. Hence, in this study, manganese-based disordered rock salt oxyfluorides Li2Mn1–xVxO2F (0 ≤ x ≤ 0.5) are synthesized as cathode materials for lithium-ion batteries using high-energy mechanochemical ball-milling. The effect of partial vanadium substitution on the sample properties is analyzed, focusing on the electrochemical properties. Furthermore, a heat treatment process for stabilization of the samples is followed, where the morphology and structure of the samples are studied by powder X-ray diffraction and electron microscopy (SEM/TEM). The oxidation states of the transition metals in the synthesized compositions are further investigated using X-ray absorption near-edge structure spectroscopy. The data analysis reveals that the heat treatment resulted in increased symmetry and reduced defects of ball-milled compounds, but it may also affect the local fluorination degree in the structure. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000154506
Veröffentlicht am 13.01.2023
DOI: 10.1021/acsmaterialsau.2c00064
Zitationen: 5
Zitationen: 5
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 2694-2461
KITopen-ID: 1000154506
HGF-Programm 38.02.01 (POF IV, LK 01) Fundamentals and Materials
Weitere HGF-Programme 43.35.01 (POF IV, LK 01) Platform for Correlative, In Situ & Operando Charakterizat.
Erschienen in ACS Materials Au
Verlag American Chemical Society (ACS)
Band 3
Heft 2
Seiten 132–142
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 14.12.2022
Schlagwörter Mn-based cathodes; disordered rock salt; oxyfluorides; structure stabilization; battery performance; X-ray absorption spectroscopy
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