In this study, the compound Li₃BO₃ (LBO) is intended to be prepared by a polymeric complex method as a sintering aid for the densification of Li₇La₃Zr₂O₁₂ (LLZ) solid electrolyte. A polymeric precursor containing Li and B is heat-treated in an air atmosphere at a temperature range between 600°C and 800°C. Instead of LBO, the compound Li_2+xC_1-xB_xO₃ (LCBO) is unexpectedly synthesized after a heat-treatment of 700°C. The effect of LCBO addition on sintering behavior and ion conductivity of LLZ is studied. It is found that the LCBO compound could lead to significant improvements in the densification and ionic conductivity of LLZ compared to pure LLZ. After sintering at 1100°C, the density of the LLZ-12wt%LBO composite is 3.72 g/cm³, with a high Li-ion conductivity of 1.18 × 10⁻⁴ Scm^-1 at 28°C, while the pure LLZ specimen had a densify of 2.98 g/cm³ and Li-ion conductivity of 5.98 × 10⁻⁶ Scm^-1.

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• Characterization of Li1.5Al0.5Ge1.5(PO4)3 Solid Electrolyte with an Added Sintering Aid
  Hyun-Joon Lee, Liyu-Liu, Won-Jong Jeong, Seoung-Ki Lee, Bong-Ki Ryu
  Electronic Materials Letters.2023; 19(1): 55.     CrossRef