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.
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Cherkashchenko et al. (2025) studied this question.
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