Integrating nanoscale lanthanum oxide (La2O}3, typically defined as particle diameters between 20nm and 100nm) into the synthesis of oxide solid-state electrolytes represents a major step forward in processing efficiency. For materials like Garnet-type Li7La3Zr2O12 (LLZO) and Perovskite-type Li{3x}La{2/3-x}TiO3 (LLTO), switching from micro-scale precursors to a high-surface-area nano-precursor fundamentally alters the thermodynamics of the reaction. 

Depressed Sintering and Calcination Temperatures: The primary driving force for ceramic densification during sintering is the reduction of total surface free energy (ΔG = γΔA. Because nanoscale particles possess an extraordinarily high specific surface area (>20 m2/g} compared to < 2m2/g for micro-powders), they exhibit vastly enhanced surface energy. This thermodynamic state allows the solid-state reaction to occur at much lower temperatures. The initial calcination step required to nucleate the cubic LLZO phase can be dropped from the traditional 900°C down to 650°C to 700°C. Consequently, the final pellet densification temperature can be lowered by 100°C to 150°C.

Suppression of Lithium Volatilization: In oxide electrolyte synthesis, the aggressive volatilization of lithium (as gaseous Li2O) at temperatures above 1050°C is a constant challenge. This loss shifts the stoichiometry and causes the highly conductive cubic garnet phase to decompose into the poorly conductive tetragonal phase or insulating pyrochlore (La2Zr2O7) at grain boundaries. By using nano-La2O3 to lower the sintering window safely below the aggressive volatilization threshold (<1000°C), the target stoichiometry is well preserved. This reduces or even eliminates the need to add massive, unpredictable lithium excesses (traditionally 10–15 wt%) to the initial precursor blend.                           

Notes: Please store the La2O3 powder in a dry place (glovebox is preferred).

References: 

1. K. Onoue, et al. Exploring the Low-Temperature Synthesis Pathway of Lithium Ionic Conductor Garnet-Type Solid Electrolytes, ACS Appl. Energy Mater. 2026, DOI: 10.1021/acsaem.6c00752
2. Z. Luo, et al. La2O3 substitution in Li-Al-P-O-N glasses for potential solid electrolytes applications, Solid State Ionics, 2016, 295, 104-110