Synthesize and lithium ionic conductivity of the Li3BO3-Li6.5La3Zr1.5Ta0.5O12 composite solid electrolyte.

For synthesizing Li_6.5La₃Zr_1.5Ta_0.5O₁₂ solid electrolyte with high lithium-ionic conductivity at a relatively low temperature, another kind of solid electrolyte with lower melting point, Li₃BO₃, was added, and the molar ratio of Li₃BO₃ to Li_6.5La₃Zr_1.5Ta_0.5O₁₂ changed from 0 to 0.9. As a result, the sintering temperature decreased to 800 °C. Meanwhile, the influence rules of Li₃BO₃ on the composition, structure and ionic conductivity of the composite electrolytes were detected and analyzed. The lithium ion conductivity of the electrolytes went up firstly and then decreased as the amount of Li₃BO₃ increased. And the sample with the molar ratio of 0.7 Li₃BO₃ got the highest ionic conductivity as high as 4.5 X 10^-5 S/cm at room temperature, while the sample without Li₃BO₃ had only 5 5 X 10^-6 S/cm Moreover, according to the scanning electron microscope (SEM) results, the addition of Li₃BO₃ could promote the grain growth and densification of Li_6.5La₃Zr_1.5Ta_0.5O₁₂, as well as the total properties of the composite electrolyte. [ABSTRACT FROM AUTHOR]