I. R. Cherkashchenko, R. V. Panin, A. V. Babkin, D. A. Novichkov, E. V. Antipov, N. R. Khasanova, “NaAlNb(PO4)3 NASICON-type phosphate with the Nb5+/Nb4+/Nb3+ multielectron redox activity on sodium intercalation”, Mendeleev Commun., 2025, Volume 35, Issue 4,Pages 393

Communications

NaAlNb(PO₄)₃ NASICON-type phosphate with the Nb⁵⁺/Nb⁴⁺/Nb³⁺ multielectron redox activity on sodium intercalation

I. R. Cherkashchenko^ab, R. V. Panin^b, A. V. Babkin^b, D. A. Novichkov^b, E. V. Antipov^ab, N. R. Khasanova^b

^a Skolkovo Institute of Science and Technology, 143025 Moscow, Russian Federation
^b Department of Chemistry, M. V. Lomonosov Moscow State University, 119991 Moscow, Russian Federation

Abstract: The NASICON-structured NaAlNb(PO₄)₃ phosphate was synthesized via Pechini sol–gel technique. Electrochemical measurements in sodium half-cells have disclosed that NaAlNb(PO₄)₃ can reversibly intercalate 2Na⁺ ions per formula unit owing to the Nb⁵⁺/Nb⁴⁺/Nb³⁺ multielectron redox processes, which was confirmed by the Nb K-edge XANES measurements. Differential thermal calorimetry has revealed an excellent thermal stability of the sodiated NaAlNb(PO₄)₃/C electrode material up to the point of electrolyte decomposition.

Keywords: NASICON-type phosphate, sodium-ion battery, niobium multielectron redox reaction, thermal stability, sol–gel synthesis.

Received: 03.10.2024
Accepted: 17.12.2024

Language: English

DOI: 10.71267/mencom.7637

	*Supplementary materials:*
		Supplementary_data_1.pdf	590.8 Kb