High Entropy Materials

A High-Entropy Multicationic Substituted Lithium Argyrodite Superionic Solid Electrolyte

“…23 specifically having more than five elements sharing a single crystallographic site, refers to so-called high-entropy materials (HEMs) with ΔS config ≥ 1.5R. 24 Note that ΔS config represents the configurational entropy and can be calculated as detailed in the Supporting Information. In recent years, the concept of HEMs has been extended from high-entropy alloys to different oxide-, carbide-, and sulfide-based materials.…”

“…This kind of improvement is generally attributed to changes in the Li sublattice, with occupation of “additional” sites − and/or increased S 2– /X – site inversion, such as in the case of Li 6.6 Si 0.6 Sb 0.4 S 5 I (∼15 and 24 mS cm –1 for cold-pressed and sintered pellets, respectively) and Li 6.6 P 0.4 Ge 0.6 S 5 I (∼6 and 18 mS cm –1 for cold-pressed and sintered pellets, respectively). ,− Recently, it has been shown that multianionic substituted lithium argyrodites do not possess increased ionic conductivity, although the activation energy for conduction strongly decreased . Multielement (equimolar) substitution, specifically having more than five elements sharing a single crystallographic site, refers to so-called high-entropy materials (HEMs) with Δ S config ≥ 1.5 R . Note that Δ S config represents the configurational entropy and can be calculated as detailed in the Supporting Information.…”