Lithium Iodide (LiI, Anhydrous, 99.9%) Precursor Powder for Sulfide & Halide Solid-State Electrolyte Synthesis, 25 or 50 g/bottle, CBSSEPCLI
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Lithium iodide (LiI) is a vital precursor for incorporating heavy halide anions into sulfide-based solid-state electrolytes. It is primarily utilized in synthesizing iodide-doped argyrodites (e.g., Li6PS5I), high-conductivity glass-ceramics (such as 70Li2S * 30P2S5 doped with LiI), and multi-anion sulfide systems. The large, highly polarizable iodide anion (I-) expands the unit cell volume of the sulfide framework, softens the lattice, and weakens the electrostatic binding energy between Li+ ions and the anion framework. This significantly lowers the activation energy for lithium migration, pushing room-temperature ionic conductivities to impressive levels
The role of LiI depends fundamentally on the structural nature of the host sulfide matrix: (1) In Amorphous/Glassy Sulfides (e.g., Li2S-P2S5-LiI). In traditional binary sulfide glasses, LiI acts as a structural modifier. It does not form a covalent part of the PS4^{3-} network. Instead, LiI dissolves into the interstitial spaces of the amorphous glass matrix. The highly polarizable I- ions "open up" the local free volume of the glass, creating wide, smooth pathways for rapid Li+ hopping without requiring a high-temperature crystallization step. (2) In Crystalline Argyrodites (e.g., Li6PS5I). In the cubic argyrodite lattice, the large ionic radius of I- alters the structural symmetry. Unlike Li6PS5Cl and Li6PS5Br—which exhibit high {S}^{2-}/X- site disorder—the large size of the I- ion forces it to remain strictly ordered, occupying the specific 4a Wyckoff site. This complete structural order can sometimes restrict certain intra-cage hopping pathways, meaning pure iodide argyrodites occasionally exhibit lower room-temperature ionic conductivity than their bromide counterparts unless engineered via multi-anion mixing (e.g., Li6PS5Cl(1-x)Ix).
| Part Number |
CBSSEPCLI (C-BSSE-PC-LI) |
| CAS |
10377-51-2 |
| Purity |
>99.9% |
| Molecular Weight |
133.85 g/mol |
| Water Level |
<0.005 wt% (battery grade, anhydrous) |
| Melt Point |
446 °C(lit.) |
| Boling Point |
1171 °C |
| Density |
3.49 g/mL at 25 °C(lit.) |
| Package Grade |
25 g or 50 g/bottle |
Notes: Please store the LiI powder in a dry place (glovebox is preferred due to its air/humidity sensitivity).
References:
- S. Wang, et al. An Iodide-Chloride Solid Electrolyte Compatible with Lithium Metal for All-Solid-State Lithium Batteries, ACS Appl. Mater. Interfaces 2025, 17, 31, 44430–44439
- C. Li, et al. Building a Better All-Solid-State Lithium-Ion Battery with Halide Solid-State Electrolyte, ACS Nano 2025, 19, 4, 4121–4155
