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Title:Ceramic synthesis of disordered lithium rich oxyfluoride materials
Authors:Ateba Mba, Jean-Marcel (Author)
Arčon, Iztok (Author)
Mali, Gregor (Author)
Tchernychova, Elena (Author)
Witte, Ralf (Author)
Kruk, Robert (Author)
Gaberšček, Miran (Author)
Dominko, Robert (Author)
Files:This document has no files. This document may have a phisical copy in the library of the organization, check the status via COBISS. Link is opened in a new window
Language:English
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:Disordered lithium-rich transition metal oxyfluorides with a general formula Li1þxMO2Fx (M being a transition metal) are gaining more attention due to their high specific capacity which can be delivered from the facecentered cubic (fcc) structure. The most common synthesis procedure involves use of mechanosynthesis. In this work, ceramic synthesis of lithium rich iron oxyfluoride and lithium rich titanium oxyfluoride are reported. Two ceramic synthesis routes are developed each leading to the different level of doping with Li and F and different levels of cationic disorder in the structure. Three different Li1þxMO2Fx samples (x ¼ 0.25, 0.3 and 1) are compared with a sample prepared by mechanochemical synthesis and non-doped LiFeO2 with fcc structure. The obtained lithium rich iron oxyfluoride are characterized by use of M€ossbauer spectroscopy, X-ray absorption spectroscopy, NMR and TEM. Successful incorporation of Li and F have been confirmed and specific capacity that can be obtained from the samples is in the correlation with the level of disorder introduced with doping, nevertheless oxidation state of iron in all samples is very similar. Conclusions obtained from lithium rich iron oxyfluoride are validated by lithium rich titanium oxyfluoride.
Keywords:Lithium batteries Face centered-cubic Oxyfluoride Li-rich Disorder
Year of publishing:2020
Number of pages:11
Numbering:467
COBISS_ID:18332163 Link is opened in a new window
URN:URN:SI:UNG:REP:GWRBSJGR
DOI:10.1016/j.jpowsour.2020.228230 Link is opened in a new window
License:CC BY-NC-ND 4.0
This work is available under this license: Creative Commons Attribution Non-Commercial No Derivatives 4.0 International
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Title:Journal of power sources
Year of publishing:2020

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