Effects of fluorination on the structure, magnetic and electrochemical properties of the P2-type NaxCoO2 powder
Authors
Jugović, Dragana
Milović, Miloš

Popović, Maja

Kusigerski, Vladan

Škapin, Srečo Davor

Rakočević, Zlatko

Mitrić, Miodrag

Article (Accepted Version)
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The main goal of this research has been to investigate for the first time the effects of fluorination on the crystal structure, magnetic, and electrochemical properties of the P2-type NaxCoO2 powder. Sodium cobalt oxide with a P2-type structure is synthesized by a modified solid-state reaction consisting of alternating processes of rapid heating up to 750 °C and rapid cooling to the room temperature. The obtained powder is fluorinated using a gas-solid reaction with NH4HF2 as fluorinating agent. Fluorination causes a decrease of sodium content in the parent phase with the concurrent formation of the minor phases of Na2CO3 and NaF. The structure of NaxCoO2 in both powders is refined in P63/mmc space group. The results of the Rietveld refinement combined with the findings from the XPS measurements confirm the Na0.76CoO2 and Na0.44CoO1.96F0.04 stoichiometries for the pristine and fluorinated powders, respectively, which indicates that 4 at.% of fluorine ions per formula unit are incorpora...ted in the structure. Preliminary electrochemical investigations have revealed an improved charge/discharge performance. The influence of fluorination on morphology and magnetic properties has also been examined.
Keywords:
crystal structure / energy storage materials / gas–solid reactions / magnetic measurements / photoelectron spectroscopies / X-ray diffractionSource:
Journal of Alloys and Compounds, 2019, 774, 30-37Funding / projects:
- Molecular designing of nanoparticles with controlled morphological and physicochemical characteristics and functional materials based on them (RS-45004)
- Magnetic and radionuclide labeled nanostructured materials for medical applications (RS-45015)
Note:
- Supporting information: https://hdl.handle.net/21.15107/rcub_dais_5970
- Published version: https://hdl.handle.net/21.15107/rcub_dais_3980
Related info:
- Version of
https://hdl.handle.net/21.15107/rcub_dais_3980 - Version of
http://dx.doi.org/10.1016/j.jallcom.2018.09.372 - Referenced by
https://hdl.handle.net/21.15107/rcub_dais_5970
DOI: 10.1016/j.jallcom.2018.09.372
ISSN: 0925-8388
WoS: 000449743600004
Scopus: 2-s2.0-85054182731
URI
http://www.sciencedirect.com/science/article/pii/S0925838818336375https://dais.sanu.ac.rs/123456789/3978
Institution/Community
Институт техничких наука САНУ / Institute of Technical Sciences of SASATY - JOUR AU - Jugović, Dragana AU - Milović, Miloš AU - Popović, Maja AU - Kusigerski, Vladan AU - Škapin, Srečo Davor AU - Rakočević, Zlatko AU - Mitrić, Miodrag PY - 2019 UR - http://www.sciencedirect.com/science/article/pii/S0925838818336375 UR - https://dais.sanu.ac.rs/123456789/3978 AB - The main goal of this research has been to investigate for the first time the effects of fluorination on the crystal structure, magnetic, and electrochemical properties of the P2-type NaxCoO2 powder. Sodium cobalt oxide with a P2-type structure is synthesized by a modified solid-state reaction consisting of alternating processes of rapid heating up to 750 °C and rapid cooling to the room temperature. The obtained powder is fluorinated using a gas-solid reaction with NH4HF2 as fluorinating agent. Fluorination causes a decrease of sodium content in the parent phase with the concurrent formation of the minor phases of Na2CO3 and NaF. The structure of NaxCoO2 in both powders is refined in P63/mmc space group. The results of the Rietveld refinement combined with the findings from the XPS measurements confirm the Na0.76CoO2 and Na0.44CoO1.96F0.04 stoichiometries for the pristine and fluorinated powders, respectively, which indicates that 4 at.% of fluorine ions per formula unit are incorporated in the structure. Preliminary electrochemical investigations have revealed an improved charge/discharge performance. The influence of fluorination on morphology and magnetic properties has also been examined. T2 - Journal of Alloys and Compounds T1 - Effects of fluorination on the structure, magnetic and electrochemical properties of the P2-type NaxCoO2 powder SP - 30 EP - 37 VL - 774 DO - 10.1016/j.jallcom.2018.09.372 UR - https://hdl.handle.net/21.15107/rcub_dais_3978 ER -
@article{ author = "Jugović, Dragana and Milović, Miloš and Popović, Maja and Kusigerski, Vladan and Škapin, Srečo Davor and Rakočević, Zlatko and Mitrić, Miodrag", year = "2019", abstract = "The main goal of this research has been to investigate for the first time the effects of fluorination on the crystal structure, magnetic, and electrochemical properties of the P2-type NaxCoO2 powder. Sodium cobalt oxide with a P2-type structure is synthesized by a modified solid-state reaction consisting of alternating processes of rapid heating up to 750 °C and rapid cooling to the room temperature. The obtained powder is fluorinated using a gas-solid reaction with NH4HF2 as fluorinating agent. Fluorination causes a decrease of sodium content in the parent phase with the concurrent formation of the minor phases of Na2CO3 and NaF. The structure of NaxCoO2 in both powders is refined in P63/mmc space group. The results of the Rietveld refinement combined with the findings from the XPS measurements confirm the Na0.76CoO2 and Na0.44CoO1.96F0.04 stoichiometries for the pristine and fluorinated powders, respectively, which indicates that 4 at.% of fluorine ions per formula unit are incorporated in the structure. Preliminary electrochemical investigations have revealed an improved charge/discharge performance. The influence of fluorination on morphology and magnetic properties has also been examined.", journal = "Journal of Alloys and Compounds", title = "Effects of fluorination on the structure, magnetic and electrochemical properties of the P2-type NaxCoO2 powder", pages = "30-37", volume = "774", doi = "10.1016/j.jallcom.2018.09.372", url = "https://hdl.handle.net/21.15107/rcub_dais_3978" }
Jugović, D., Milović, M., Popović, M., Kusigerski, V., Škapin, S. D., Rakočević, Z.,& Mitrić, M.. (2019). Effects of fluorination on the structure, magnetic and electrochemical properties of the P2-type NaxCoO2 powder. in Journal of Alloys and Compounds, 774, 30-37. https://doi.org/10.1016/j.jallcom.2018.09.372 https://hdl.handle.net/21.15107/rcub_dais_3978
Jugović D, Milović M, Popović M, Kusigerski V, Škapin SD, Rakočević Z, Mitrić M. Effects of fluorination on the structure, magnetic and electrochemical properties of the P2-type NaxCoO2 powder. in Journal of Alloys and Compounds. 2019;774:30-37. doi:10.1016/j.jallcom.2018.09.372 https://hdl.handle.net/21.15107/rcub_dais_3978 .
Jugović, Dragana, Milović, Miloš, Popović, Maja, Kusigerski, Vladan, Škapin, Srečo Davor, Rakočević, Zlatko, Mitrić, Miodrag, "Effects of fluorination on the structure, magnetic and electrochemical properties of the P2-type NaxCoO2 powder" in Journal of Alloys and Compounds, 774 (2019):30-37, https://doi.org/10.1016/j.jallcom.2018.09.372 ., https://hdl.handle.net/21.15107/rcub_dais_3978 .