Journal Article

FZJ-2026-02325

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Disorder‐Driven Fast $Na^+$ Transport: From Crystalline to Amorphous Networks in the Mixed‐Anion $NaTaO_xCl_{6−2x}$ Oxychlorides

Leifeld, J.FZJ* ; Parsons, A. C. ; Morscher, A. ; Martinez de Irujo-Labalde, X. ; Kraft, M. A.FZJ* ; Soulas, O. G. ; Samanta, B. ; Zielasko, W. ; Yadav, N. ; Strotmann, K. ; Jalarvo, N. ; Rodrigues, B. V. M. ; Slabon, A. ; Adelhelm, P. ; Hansen, M. R. ; Scanlon, D. O. ; Zeier, W. G. (Corresponding author)FZJ* ; Squires, A. G. (Corresponding author)

2026
Wiley-VCH Weinheim

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Please use a persistent id in citations: doi:10.1002/aenm.70977  doi:10.34734/FZJ-2026-02325

Abstract: Solid electrolytes are central to enabling safe, high-energy solid-state sodium batteries. While oxyhalide-type conductors have rapidly advanced lithium-based systems, their sodium analogues remain less understood and underdeveloped. This gap arises from their intrinsically amorphous nature, which obscures structure–transport relationships and limits rational design. Here, we elucidate the atomic-scale origins of sodium-ion conduction in the mixed-anion series $NaTaO_xCl_{6–2x}$ using a combination of experimental and computational approaches. We reveal that composition-dependent, disordered yet extended chain motifs emerge as key structural units governing ion mobility. By tuning chain connectivity, we achieve a high ionic conductivity of ∼4 $mS cm^{−1}$ and a corresponding self-diffusion coefficient of 6.6–8.2 $× 10^{−11} {m^2}s^{−1}$, ranking among to the fastest reported for sodium oxyhalides. These findings establish clear structure–property correlations in amorphous superionic conductors and provide a blueprint for the targeted design of next-generation solid electrolytes for sodium solid-state batteries.

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Contributing Institute(s):

1. Helmholtz-Institut Münster Ionenleiter für Energiespeicher (IMD-4)

Research Program(s):

1. 1221 - Fundamentals and Materials (POF4-122) (POF4-122)

Appears in the scientific report 2026

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 25 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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