Ionic conductivity of and phase transition in lithium thiophosphate Li3PS4
Abstract A phase transition of Li 3 PS 4 has been revealed at 190°C both by DTA and by a discontinuity in the Arrhenius plots of conductivity. The conductivity is increased by a step of 0.5 (log σ), and the low and high temperature ranges are characterized by activation energies of respectively 0.49 (±0.01) eV and 0.46 (±0.01) eV. A small order-disorder of the Li + ion distribution might be the source of this phenomenon; Li 3 PS 4 may be considered as a good lithium crystalline electrolyte ( σ 25°C =3 × 10 −7 S cm −1 ).