The effect of sintering process on lithium ionic conductivity of Li6.4Al0.2La3Zr2O12 garnet produced by solid-state synthesis

Wenjuan Xue; Yaping Yang; Qiaoling Yang; Yuping Liu; Lian Wang; Changguo Chen; Renju Cheng

doi:10.1039/c8ra01329b

The effect of sintering process on lithium ionic conductivity of Li_6.4Al_0.2La₃Zr₂O₁₂ garnet produced by solid-state synthesis

RSC Adv. 2018 Apr 9;8(24):13083-13088. doi: 10.1039/c8ra01329b.

Authors

Wenjuan Xue^{1

2}, Yaping Yang², Qiaoling Yang³, Yuping Liu¹, Lian Wang², Changguo Chen¹, Renju Cheng²

Affiliations

¹ College of Chemistry and Chemical Engineering, Chongqing University Chongqing 401331 China cgchen@cqu.edu.cn +86 23 65678934 +86 23 65678934.
² Chongqing Research Center for Advanced Materials, Chongqing Academy of Science and Technology Chongqing 401123 China.
³ School of Materials Science and Engineering, Sichuan University of Science and Engineering Zigong 643000 China.

Abstract

Recently, solid-state electrolyte lithium lanthanum zirconium oxide garnet (Li₇La₃Zr₂O₁₂, LLZO) has attracted great attention due to its high room temperature conductivity of lithium ions and stability against lithium metal electrodes. The Al-doped cubic garnet Li_6.4Al_0.2La₃Zr₂O₁₂ was synthesized by a conventional solid-state method at different sintering temperatures. The influence of the sintering process on the structure and ionic conductivity was investigated by X-ray diffraction, electrochemical impedance spectroscopy, and scanning electron microscopy. The results showed that Li vaporization and relative density were affected by the sintering process. The synergistic effects of Li concentration and relative density determined the Li⁺ ionic conductivity. Compared with the relative density, the Li concentration plays a more important role in determining the ionic conductivity via the solid-state method.