Effect of Sintering Temperature and Holding Time on Ionic Conductivity for Li_(6.4)La_3Zr_(1.4)Ta_(0.6)O_(12) Electrolyte

摘要

Garnet-type Li_(6.4)La_3Zr_(1.4)Ta_(0.6)O_(12) (LLZTO) is considered as one of the most potential electrolytes for solid state lithium batteries. Sintering process is a critical step in the preparation of LLZTO. Herein, LLZTO solid-state electrolytes were prepared by high temperature solid-phase reaction with different sintering temperature from 1150 to 1250 °C and different sintering holding time from 1 min to 60 min. According to EIS, electrolytes with high ionic conductivity up to 8.1 × 10~(-4) S cm~(-1) were obtained by sintering at 1200 °C for 20 min. Besides, LLZTO pellets prepared in this experimental condition show high density reaching up to 97.6%. Li symmetric cell with the LLZTO sintered at 1200 °C for 20 min also exhibits stable cycle performance under current density of 0.25 mA cm~(-2) at room temperature.