Ionic conductivity improvement of Li0.5La0.5TiO3 solid electrolyte by addition of borosilicate glasses

Abstract

Borosilicate glass has certain toughness, and doping it into the brittle Li_0.5La_0.5TiO₃ (LLTO) solid electrolyte can not only improve the mechanical strength, but also enhance the ionic conductivity. However, as the different components in the glass change, the degree of improvement in the ion conductivity of the composite solid electrolyte also varies. Herein, Li₂O–B₂O₃–SiO₂ (LBS) glasses with different Si/B ratio, Li₂O–B₂O₃–SiO₂–Al₂O₃ (LBSA) glasses with different B/Al ratio and LLTO solid electrolyte were prepared, respectively. The effects of adding these two types of glasses separately on the microstructure and ionic conductivity of the LLTO solid electrolyte were studied. At room temperature, the highest ionic conductivity observed in the solid electrolytes doped with LBS was 1.0 × 10⁻³ S cm⁻¹, while the maximum value for LBSA glass-doped solid electrolyte reached 1.31 × 10⁻³ S cm⁻¹. This research provides a new idea for the development of solid-state electrolytes.