Investigating the Li + substructure and ionic transport in Li 10 GeP 2- x Sb x S 12 (0 ≤ x ≤ 0.25).

Understanding the correlation between ionic motion and crystal structure is crucial for improving solid electrolyte conductivities. Several substitution series in the Li 10 GeP 2 S 12 structure have shown a favorable impact on the ionic conductivity, e.g. the replacement of P(+V) by Sb(+V) in Li 10 GeP 2 S 12 . However, here the interplay between the structure and ionic motion remains elusive. X-Ray diffraction, high-resolution neutron diffraction, Raman spectroscopy and potentionstatic impedance spectroscopy are employed to explore the impact of Sb(+V) on the Li 10 GeP 2 S 12 structure. The introduction of antimony elongates the unit cell in the c -direction and increases the M(1)/P(1) and Li(2) polyhedral volume. Over the solid solution range, the Li + distribution remains similar, an inductive effect seems to be absent and the ionic conductivity is comparable for all compositions. The effect of introducing Sb(+V) in Li 10 GeP 2 S 12 cannot be corroborated.