The copper argyrodites Cu7-PS6-Br : Crystal growth, structures and ionic conductivity

Electrical Conductivity and Thermoelectrical Parameters of Argyrodite-Type Cu7 – xPS6 – xIx Mixed Crystals

“…It is shown in Ref. [27] that, for Cu 7− PS 6− Br mixed crystals, the ionic conductivity nonlinearly changes from 7.0 S/m for Cu 7 PS 6 to 0.5 S/m for Cu 6 PS 5 Br [27] in the process of heterovalent substitution. Taking the obtained values of the ionic conductivity [27] into account, the ratio of el / ion variates from 1.8 for Cu 7 PS 6 to 3810 for Cu 6 PS 5 Br.…”

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“…The proximity of the crystal lattice parameters [14] determines a significant amount of solid solutions between compounds with the structure of argyrodite formed by both isovalent and heterovalent substitution [20][21][22][23][24][25][26]. This is used to optimize the functional parameters of the materials under study.…”

Strongly Anharmonic Phonons and Their Role in Superionic Diffusion and Ultralow Thermal Conductivity of Cu7PSe6

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Solid-state battery (SSB) technology is a promising route to overcome the limitations of conventional lithium-ion batteries, for example, to improve safety and power density. The argyrodite compounds, characterized by the general formula A 7 BCh 6 (A = Cu, Ag, Li; B = P, As, Sb, and Ch = S, Se), are known for their high ionic conductivity, [4][5][6][7][8][9][10] and Li argyrodites have been extensively studied as candidate solid-state electrolytes. [7,[9][10][11][12][13][14][15][16] The Cu and Ag-based argyrodites are of further interest for their promising thermoelectric performance, [1,[17][18][19][20][21] partly enabled by their ultralow thermal conductivities (≈0.3 W m −1 K −1 at 300 K).

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