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Updated: Oct 11, 2025

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Published on: October 10, 2016
Sn Substitution in the Lithium Superionic Argyrodite Li6PCh5I (Ch = S and Se)
Ajay Gautam1, Michael Ghidiu1, Anna-Lena Hansen2
1Institute of Physical Chemistry, Justus-Liebig-University Giessen, Heinrich-Buff-Ring 17, D-35392 Giessen, Germany.
Abstract:
The lithium argyrodites Li6PS5X (X = Cl, Br, and I) have attracted interest as fast solid ionic conductors for solid-state batteries. Within this class of materials, it has been previously suggested that more polarizable anions and larger substituents should influence the ionic conductivity (e.g., substituting S by Se). Building upon this work, we explore the influence of Sn substitution in lithium argyrodites Li6+SnP1-Se5I in direct comparison to the previously reported Li6+SnP1-S5I series. The (P5+/Sn4+)Se43/4- polyhedral volume, unit cell volume, and lithium coordination tetrahedra Li(48h)-(S/Se)3-I increase with Sn substitution in this new selenide series. Impedance spectroscopy reveals that increasing Sn4+ substitution results in a fivefold improvement in the ionic conductivity when compared to Li6PSe5I. This work provides further understanding of compositional influences for optimizing the ionic conductivity of solid electrolytes.
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