Lithium Oxide (Li2O, 99.9%) Precursor Powder for Solid-State Electrolyte Synthesis, 50 g/bottle, CBSSEPCLO

Li2O is increasingly utilized as an oxygen-introducing precursor to create oxysulfide (e.g., Li2S-P2S5-Li2O) or oxyhalide (e.g., x Li2O}-TaCl5) glass-ceramic solid electrolytes.

Amorphization and Structural Distortion: Introducing a precise ratio of Li2O into a chloride or sulfide matrix alters the local atomic coordination: (1) In halide systems like Li2O-TaCl5, the oxygen atoms displace a portion of the chlorine atoms, forcing the rigid dimers to break down into distorted [TaCl(5-a)Oa]^{a-} polyhedra. (2) This oxygen-bridged corner-sharing polyhedral network breaks up long-range crystalline order, facilitating low-temperature amorphization. The highly disordered local environment lowers the activation energy barrier for moving lithium ions, increasing room-temperature ionic conductivity (>1 mS/cm).

Sintering Kinetics & Volatilization In Garnets: When using Li2O for oxide-based ceramics like Cubic LLZO (Li7La3Zr2O12): (1) At typical solid-state calcination temperatures (>1000 C), Li2O exhibits a very high vapor pressure. If it volatilizes unhindered, the system undergoes a phase transition into the poorly conducting pyrochlore phase (La2Zr2O7). (2) A 10 to 15 mol% excess of the Li2O precursor must be budgeted into the starting batch. The green compact is typically shrouded in a sacrificial "mother powder" of identical target composition to create a localized, saturated Li2O vapor atmosphere inside the crucible, blocking bulk net lithium loss from the core sample.

Notes: Please store the Li2O powder in a dry place (glovebox is preferred).

References: 

1. A. Tron, et al. Synthesis of the solid electrolyte Li2O–LiF–P2O5 and its application for lithium-ion batteries, Solid State Ionics, 2017, 308, 40-45
2. Y. Fujita, et al. Structural Investigation of Li2O–LiI Amorphous Solid Electrolytes, J. Phys. Chem. C 2023, 127, 30, 14687–14693