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Experimental grain-size effect in argyrodites

Establish the dependence of ionic conductivity on grain size in argyrodite Li6PS5X solid electrolytes under controlled synthesis conditions to resolve the currently unclear experimental grain-size effect.

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Background

Grain size is expected to affect macroscopic transport in polycrystalline argyrodites due to the presence of grain boundaries, but experiments face challenges: grain size is hard to control and conductivities vary with synthesis methods.

The authors provide simulation-based predictions for grain-size-dependent transport but point out that the experimental situation remains unclear, underscoring the need for carefully controlled studies.

References

Experimentally, the grain-size effect in argyrodites remains unclear, as grain size is difficult to control and conductivity varies with synthesis (cf. Fig. 4c).

— Non-Arrhenius Li-ion transport and grain-size effects in argyrodite solid electrolytes (2510.18630 - Ou et al., 20 Oct 2025) in Section III. Non-Arrhenius transport and grain-size effects