NaSICON NaFe<sub>2</sub>PO<sub>4</sub>(SO<sub>4</sub>)<sub>2</sub> Revisited: Insights into the Crystal Structure and Electrochemical Performance

With the aim to meet the needs for positive electrode materials for Na-ion batteries, based on abundant elements, synthesis routes using two different Fe3+ precursors were explored for the preparation of a pure mixed phosphate-sulfate NaSICON-type compound, NaFe23+PO4(SO4)2 (NFPS). Interestingly, a structural model described in the R-3 space group is found from careful analysis of X-ray, neutron, and electron diffraction. Atoms P and S (and thus, PO4 and SO4 anionic groups) are statistically distributed within the polyanionic framework, with a splitting of the conventional Na2 3b site into two positions 3a and 18f. Na-half cells with NFPS as a positive electrode material delivered 126 mAh/g, nearly the full theoretical capacity, at a cycling rate of D/30–C/30 (i.e., the exchange of 2 Na+ in 30 h).

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Publication Details

Journal
ACS Applied Energy Materials
Published
2025-09-09
DOI
https://doi.org/10.1021/acsaem.5c01935
Citations
2
Primary Topic
Advancements in Battery Materials
Type
article
Field-Weighted Citation Impact
1.46
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article

NaSICON NaFe2PO4(SO4)2 Revisited: Insights into the Crystal Structure and Electrochemical Performance

Laurence Croguennec, Mathieu Duttine, Emmanuelle Suard, Christian Masquelier et al.
2 citations
ACS Applied Energy Materials
Advancements in Battery Materials
1.46
article

NaSICON NaFe2PO4(SO4)2 Revisited: Insights into the Crystal Structure and Electrochemical Performance

Laurence Croguennec, Mathieu Duttine, Emmanuelle Suard, Christian Masquelier, Anastasia Grebenshchikova, Loïc Simonin, Jacob Olchowka, François Weill
article en
2 citations

Abstract

With the aim to meet the needs for positive electrode materials for Na-ion batteries, based on abundant elements, synthesis routes using two different Fe3+ precursors were explored for the preparation of a pure mixed phosphate-sulfate NaSICON-type compound, NaFe23+PO4(SO4)2 (NFPS). Interestingly, a structural model described in the R-3 space group is found from careful analysis of X-ray, neutron, and electron diffraction. Atoms P and S (and thus, PO4 and SO4 anionic groups) are statistically distributed within the polyanionic framework, with a splitting of the conventional Na2 3b site into two positions 3a and 18f. Na-half cells with NFPS as a positive electrode material delivered 126 mAh/g, nearly the full theoretical capacity, at a cycling rate of D/30–C/30 (i.e., the exchange of 2 Na+ in 30 h).

ACS Applied Energy MaterialsVol. 8(18)
Centre National de la Recherche Scientifique (FR), Université de Bordeaux (FR), Institut Universitaire de France (FR), Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), Laboratoire d’Innovation pour les Technologies des Énergies Nouvelles et les nanomatériaux (FR), Réseau sur le Stockage Electrochimique de l'énergie (FR), Institut de Chimie de la Matière Condensée de Bordeaux (FR), Institut Laue-Langevin (FR), Laboratoire de Réactivité et Chimie des Solides (FR), Institut Polytechnique de Bordeaux (FR), Université Grenoble Alpes (FR)
Openalex Percentile: Top 15%
Advancements in Battery Materials
1.46
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