Electrochemical Performance of Highly Conductive Nanocrystallized Glassy Alluaudite-Type Cathode Materials for NIBs

Maciej Nowagiel, Mateusz J. Samsel, Edvardas Kazakevicius, Aldona Zalewska, Algimantas Kežionis and Tomasz K. Pietrzak
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Maciej Nowagiel: Faculty of Physics, Warsaw University of Technology, Koszykowa 75, PL-00-662 Warsaw, Poland
Mateusz J. Samsel: Faculty of Physics, Warsaw University of Technology, Koszykowa 75, PL-00-662 Warsaw, Poland
Edvardas Kazakevicius: Faculty of Physics, Vilnius University, Saulėtekio 9, LT-10222 Vilnius, Lithuania
Aldona Zalewska: Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, PL-00-664 Warsaw, Poland
Algimantas Kežionis: Faculty of Physics, Vilnius University, Saulėtekio 9, LT-10222 Vilnius, Lithuania
Tomasz K. Pietrzak: Faculty of Physics, Warsaw University of Technology, Koszykowa 75, PL-00-662 Warsaw, Poland

Energies, 2022, vol. 15, issue 7, 1-11

Abstract: Alluaudite-type materials are systematically attracting more attention as prospective cathode materials for sodium-ion batteries. It has been demonstrated that optimized thermal nanocrystallization of glassy analogs of various cathode materials may lead to a significant increase in their electrical conductivity. In this paper, three alluaudite-like glasses (Na 2 Fe 3 (PO 4 ) 3 —FFF, Na 2 VFe 2 (PO 4 ) 3 —VFF, and Na 2 VFeMn(PO 4 ) 3 —VFM) were synthesized and subjected to an optimized thermal nanocrystallization. This procedure resulted in nanostructured samples with increased electrical conductivity at room temperature: 5 × 10 − 7 S/cm (FFF), 7 × 10 − 5 S/cm (VFM), and 6 × 10 − 4 S/cm (VFF). The nanocrystalline microstructure was also evidenced by ultra-high-frequency impedance spectroscopy (up to 10 GHz) and proposed electrical equivalent circuits. Prototype electrochemical cells were assembled and characterized with voltage cutoffs of 1.5 and 4.5 V. The electrochemical performance was, however, modest. The gravimetric capacity varied between the studied materials, but did not exceed 35 mAh/g. Capacity retention after ca. 100 cycles was satisfactory. Further optimization of the residual-glass-to-nanocrystallite volume ratio would be desirable.

Keywords: glass ceramics; nanomaterials; cathode materials; nanocrystallization; alluaudite (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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