Effects of fluorination on the structure, magnetic and electrochemical properties of the P2-type NaxCoO2 powder
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2019
Authors
Jugović, DraganaMilović, Miloš
Popović, Maja
Kusigerski, Vladan
Škapin, Srečo Davor
Rakočević, Zlatko Lj.
Mitrić, Miodrag
Article (Published version)
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© 2018 Elsevier B.V.
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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. © 2018 Elsevier B.V.
Keywords:
Energy storage materials / Gas–solid reactions / Crystal structure / X-ray diffraction / Photoelectron spectroscopies / Magnetic measurementsSource:
Journal of Alloys and Compounds, 2019, 774, 30-37Funding / projects:
- Magnetic and radionuclide labeled nanostructured materials for medical applications (RS-45015)
- Molecular designing of nanoparticles with controlled morphological and physicochemical characteristics and functional materials based on them (RS-45004)
DOI: 10.1016/j.jallcom.2018.09.372
ISSN: 0925-8388
WoS: 000449743600004
Scopus: 2-s2.0-85054182731
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https://linkinghub.elsevier.com/retrieve/pii/S0925838818336375https://vinar.vin.bg.ac.rs/handle/123456789/7897
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VinčaTY - JOUR AU - Jugović, Dragana AU - Milović, Miloš AU - Popović, Maja AU - Kusigerski, Vladan AU - Škapin, Srečo Davor AU - Rakočević, Zlatko Lj. AU - Mitrić, Miodrag PY - 2019 UR - https://linkinghub.elsevier.com/retrieve/pii/S0925838818336375 UR - https://vinar.vin.bg.ac.rs/handle/123456789/7897 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. © 2018 Elsevier B.V. T2 - Journal of Alloys and Compounds T1 - Effects of fluorination on the structure, magnetic and electrochemical properties of the P2-type NaxCoO2 powder VL - 774 SP - 30 EP - 37 DO - 10.1016/j.jallcom.2018.09.372 ER -
@article{ author = "Jugović, Dragana and Milović, Miloš and Popović, Maja and Kusigerski, Vladan and Škapin, Srečo Davor and Rakočević, Zlatko Lj. 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. © 2018 Elsevier B.V.", journal = "Journal of Alloys and Compounds", title = "Effects of fluorination on the structure, magnetic and electrochemical properties of the P2-type NaxCoO2 powder", volume = "774", pages = "30-37", doi = "10.1016/j.jallcom.2018.09.372" }
Jugović, D., Milović, M., Popović, M., Kusigerski, V., Škapin, S. D., Rakočević, Z. Lj.,& 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
Jugović D, Milović M, Popović M, Kusigerski V, Škapin SD, Rakočević ZL, 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 .
Jugović, Dragana, Milović, Miloš, Popović, Maja, Kusigerski, Vladan, Škapin, Srečo Davor, Rakočević, Zlatko Lj., 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 . .