Ionic and Electronic Conductivities of Lithium Argyrodite Li6PS5Cl Electrolytes Prepared via Wet Milling and Post-Annealing

Abstract

Lithium argyrodite Li6PS5Cl powders are synthesized from Li2S, P2S5, and LiCl via wet milling and post-annealing at 500°C for 4 h. Organic solvents such as hexane, heptane, toluene, and xylene are used during the wet milling process. The phase evolution, powder morphology, and electrochemical properties of the wet-milled Li6PS5Cl powders and electrolytes are studied. Compared to dry milling, the processing time is significantly reduced via wet milling. The nature of the solvent does not affect the ionic conductivity significantly; however, the electronic conductivity changes noticeably. The study indicates that xylene and toluene can be used for the wet milling to synthesize Li6PS5Cl electrolyte powder with low electronic and comparable ionic conductivities. The all-solid-state cell with the xylene-processed Li6PS5Cl electrolyte exhibits the highest discharge capacity of 192.4 mAh·g−1 and a Coulombic efficiency of 81.3% for the first discharge cycle.

Thin Solid Electrolyte Separators for Solid-State Lithium–Sulfur Batteries

“…Moreover, the electronic conductivity of the TSE was evaluated by a chronoamperometry (at 0.2, 0.25, and 0.5 V) and measured as an average of 7.32 × 10 –11 S cm –1 , as shown in Figure S3a. This value was lower than the reported electronic conductivity of an LPSCl pellet (∼10 –10 S cm –1 ) due to the use of the nonconductive polymer binder. , …”

“…This value was lower than the reported electronic conductivity of an LPSCl pellet (∼10 −10 S cm −1 ) due to the use of the nonconductive polymer binder. 29,30 Symmetric Li−Li coin cells were assembled and evaluated under practical conditions (at 30 °C, <1 MPa inherent to the coin cell) to test the EIS and CCD with a SE pellet, and TSE. Figures 3b and S3b display the impedance spectra of the TSE and the SE pellet, respectively, assembled into symmetric Li/ SE/Li cells.…”

Rapid Synthesis of Highly Conductive Li6PS5Cl Argyrodite-Type Solid Electrolytes Using Pyridine Solvent

“…Thus, the solid electrolyte prepared by normal drying showed high conductivity (4.6 mS cm −1 ) at room temperature and was comparable to the ball-mill method. 11,19 In the case of vacuum drying, we observed impurity peaks in the XRD pattern, and no semicircles were observed in the Nyquist plot, indicating a complete drying process (Figures S1 and S2). Thus, vacuum drying successfully removed pyridine solvent and enhanced ionic conductivity.…”

Rational Optimization of Cathode Composites for Sulfide-Based All-Solid-State Batteries

“…A coulombic efficiency of 71% for the first charge–discharge cycle was obtained, which is similar to reported values [ 14 ]. Higher coulombic efficiencies could be achieved by increasing the temperature [ 30 ] or pressure [ 13 ] during the measurements. However, the feasibility of such conditions for real-world applications is questionable, and a more detailed investigation was not possible in the scope of this work.…”