Deciphering the Origin of Interface‐Induced High Li and Na Ion Conductivity in Nanocomposite Solid Electrolytes Using X‐Ray Raman Spectroscopy - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Advanced Energy Materials Année : 2024

Deciphering the Origin of Interface‐Induced High Li and Na Ion Conductivity in Nanocomposite Solid Electrolytes Using X‐Ray Raman Spectroscopy

Valerio Gulino
Henrik P Rodenburg
Didier Blanchard
Christoph Sahle
Martin Sundermann
Hlynur Gretarsson
Ad M J van der Eerden
  • Fonction : Auteur
Hebatalla Elnaggar
Frank M F de Groot
Peter Ngene
  • Fonction : Auteur
  • PersonId : 1340098

Résumé

Abstract Solid‐state electrolytes (SSEs) with high ionic conductivities are crucial for safer and high‐capacity batteries. Interface effects in nanocomposites of SSEs and insulators can lead to profound increases in conductivity. Understanding the composition of the interface is crucial for tuning the conductivity of composite solid electrolytes. Herein, X‐ray Raman Scattering (XRS) spectroscopy is used for the first time to unravel the nature of the interface effects responsible for conductivity enhancements in nanocomposites of complex hydride‐based electrolytes (LiBH 4 , NaBH 4 , and NaNH 2 ) and oxides. XRS probe of the Li, Na, and B local environments reveals that the interface consists of highly distorted/defected and structurally distinct phase(s) compared to the original compounds. Interestingly, nanocomposites with higher concentrations of the interface compounds exhibit higher conductivities. Clear differences are observed in the interface composition of SiO 2 ‐ and Al 2 O 3 ‐based nanocomposites, attributed to differences in the reactivity of their surface groups. These results demonstrate that interfacial reactions play a dominant role in conductivity enhancement in composite solid electrolytes. This work showcases the potential of XRS in investigating interface interactions, providing valuable insights into the often complex ion conductor/insulator interfaces, especially for systems containing light elements such as Li, B, and Na present in most SSEs and batteries.

Domaines

Chimie
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Dates et versions

hal-04411755 , version 1 (23-01-2024)

Identifiants

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Laura M de Kort, Masoud Lazemi, Alessandro Longo, Valerio Gulino, Henrik P Rodenburg, et al.. Deciphering the Origin of Interface‐Induced High Li and Na Ion Conductivity in Nanocomposite Solid Electrolytes Using X‐Ray Raman Spectroscopy. Advanced Energy Materials, 2024, ⟨10.1002/aenm.202303381⟩. ⟨hal-04411755⟩
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