Silicon disulfide (SiS2) is an exceptionally high-performance network-forming precursor utilized in the synthesis of both glassy and crystalline sulfide solid-state electrolytes (SSEs), such as the Li2S-SiS2 and Li2S-SiS2-Li3{PO}4 systems. Compared to phosphorus-based sulfide networks (PS4]^{3-}), silicon-based networks ([SiS4]^{4-}) feature highly polarizable Si^{4+} centers that weaken the electrostatic binding energy with mobile lithium ions. This structural trait significantly increases room-temperature ionic conductivity (>10^{-4} S cm^{-1} in purely amorphous states) and suppresses electrochemical reduction against lithium metal anodes, making SiS2 heavily favored for stabilizing the negative electrode interface 

High-Energy Mechanochemical Ball Milling: Mechanochemical amorphization is highly preferred for SiS2 systems because it forces a room-temperature reaction, completely bypassing the risks of high-temperature sublimation and quartz-tube corrosion. (1) Stoichiometric Formulation: Weighed and blended inside the Argon glovebox according to the targeted binary glass matrix (e.g., a 0.6Li2S * SiS2 system):

(2) Milling Configuration: Load the mixed powders into a premium zirconia or tungsten carbide (WC) milling jar. Utilize a high ball-to-powder weight ratio (typically 20:1) with small-diameter (5 mm) milling balls to maximize highly energetic shear forces. (3) Milling Profile: Run the planetary ball mill at 450 to 550 RPM for 20 to 40 hours. Program a mandatory alternating cooling cycle (e.g., 20 minutes of runtime followed by 15 minutes of rest) to prevent localized frictional heating from exceeding the sublimation threshold of the trapped SiS2. (4) Post-Processing: The resulting product is a highly uniform, completely amorphous glass powder featuring wide structural channels that facilitate fast Li+ transport.

Notes: Please store the SiS2 powder in a dry place (glovebox is preferred due to its air/humidity sensitivity).

References: 

1. A. Hayashi, et al. Mechanochemical synthesis of amorphous solid electrolytes using SiS2 and various lithium compounds, Solid State Ionics, 2004, 175, 1-4
2. S. Asano, et al. Effects of different glass formers on Li2S–P2S5–MS2 (M = Si, Ge, Sn) chalcogenide solid-state electrolytes, J. Am. Ceramic Soc., 2023, 106, 354-364