Yttrium(III) chloride (YCl3) is a foundational network-forming precursor for synthesizing high-performance, high-voltage halide solid-state electrolytes (SSEs), most notably lithium yttrium chloride (Li3YCl6). Within this structural framework, the trivalent yttrium ion (Y^{3+}) coordinates with six chloride anions to assemble a stable, edge-sharing [YCl6]^{3-} octahedral sub-lattice. This unique arrangement provides an open, low-barrier 3D percolation pathway for fast Li+ superionic conduction, allowing room-temperature ionic conductivities to reach ~ 10^{-3} S/cm alongside remarkable oxidative stability (>4.5 V vs. Li/Li+).

Halide electrolytes prepared with YCl3 are unique because they can be successfully navigated through both dry mechanochemical and highly scalable wet-chemical routes. Mechanochemical Ball Milling (Dry Benchmark): This is the most common laboratory method used to force a room-temperature reaction before crystal refinement. Inside an Argon glovebox (H2O, O2 < 0.1 ppm), weigh out the precursors in a strict 3:1 molar ratio:

                                           

Notes: (1) Please store the YCl3 powder in a dry place (glovebox is preferred due to its air/humidity sensitivity).

References: 

1. S. Yang, et al. Halide Superionic Conductors for All-Solid-State Batteries: Effects of Synthesis and Composition on Lithium-Ion Conductivity, ACS Energy Lett. 2024, 9, 5, 2212–2221
2. Z. Long, et al. Revisiting the mechanochemical preparation of Li3YCl6 electrolytes for all-solid-state lithium batteries: Decisive roles of water impurity in YCl3 reactant, Energy Storage Materials, 2026, 88, 105136