What Drives the Synthesis of Mixed Polyanionic Na4Fe3(PO4)2P2O7 Cathode Material and Determines its Electrochemical Behavior?

Milica Vujković^a, Aleksandra Gezović^b, Danica Bajuk Bogdanović^a, Tamara Petrović^a, Veselinka Grudić^b, Slavko Mentus^a^,^c

^aUniversity of Belgrade - Faculty of Physical Chemistry, Studentski trg 12-16, Belgrade, Serbia

^bUniversity of Montenegro, Faculty of Metallurgy and Technology, Cetinjski put bb, Podgorica, Montenegro

^cSerbian Academy of Sciences and Arts, Knez Mihajlova 35, Belgrade, Serbia

Materials for Sustainable Development Conference (MATSUS)
Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)

#SusBat - Enabling Beyond Classical Li-ion Batteries through materials development and sustainability

VALÈNCIA, Spain, 2023 March 6th - 10th

Organizers: Maria Lukatskaya and Nagore Ortiz Vitoriano

Invited Speaker, Milica Vujković, presentation 112
DOI: https://doi.org/10.29363/nanoge.matsus.2023.112
Publication date: 22nd December 2022

Today, when a real expansion of electrode materials is happening, plenty of anode and cathode structures for alkaline-ion batteries have been developed. Mixed polyoxyanion cathode materials are becoming interesting as electrode materials for sodium-ion batteries [1]. Among them, the specific family of sodium mixed polyanionic phase, with combined phosphate and pyrophosphate units, has attracted attention as cathodes for Na-ion batteries [2]. Herein, the talk will focus on sol-gel synthesis of Fe-based mixed polyanionic phase such as Na₄Fe₃(PO₄)₂P₂O₇ and its interrelation with the secondary polyanion pyrophosphate phase (Na₂FeP₂O₇). It will be shown how the synthesis conditions control the thermal PO₄^3-- P₂O₇^4-phase transition and consequently the amount of P₂O₇^4-structural units in the synthesized powder. The special attention will be paid to assignation of phosphate/pyrophosphates vibrational modes and correlation of the polyanionic phase composition with electrochemical properties in Na-based aqueous electrolyte. Also, the difference in the electrochemical behavior of mixed polyanionic phase, between typical aqueous and water-in-salt electrolytes, will be presented and discussed in terms of new directions towards development of a new generation of more sustainable energy storage devices.

References:

[1] [1] Kosova N.V.; Shindrov A.A. Mixed polyoxyanion cathode materials. Energy Storage Materials. 2021, 42, 570-593. [2] Gezović A; Vujković M. J.; Milović M.; Grudić V.; Dominko R.; Mentus S. Recent development of Na4M3(PO4)2(P2O7) as the cathode material for alkaline-ion rechargeable batteries: challenges and outlook. Energy Storage Materials. 2021, 37, 243-273. [1] Kosova N.V.; Shindrov A.A. Mixed polyoxyanion cathode materials. Energy Storage Materials. 2021, 42, 570-593. [2] Gezović A; Vujković M. J.; Milović M.; Grudić V.; Dominko R.; Mentus S. Recent development of Na4M3(PO4)2(P2O7) as the cathode material for alkaline-ion rechargeable batteries: challenges and outlook. Energy Storage Materials. 2021, 37, 243-273. Kosova N.V.; Shindrov A.A. Mixed polyoxyanion cathode materials. Energy Storage Materials. 2021, 42, 570-593.

[2] Gezović A; Vujković M. J.; Milović M.; Grudić V.; Dominko R.; Mentus S. Recent development of Na4M3(PO4)2(P2O7) as the cathode material for alkaline-ion rechargeable batteries: challenges and outlook. Energy Storage Materials. 2021, 37, 243-273.

Acknowledgements:

This work was supported by NATO Science for Peace and Security (SPS) Programme (project G5836-SUPERCAR). This research was also supported by the Ministry of Science of Montenegro and Ministry of Education, Science and Technological Development of Republic of Serbia (contract no. 451-03-68/2022- 14/200146).

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