Synthesis and Characterization of Li_(1+2x+3y)Al_x Sc_y Zn_y Ti_(2-x-2y) Si_x P_(3-x)O_(12)

摘要

Rare earth mineral fast ion conductors of Li_(1+2x+3y)Al_xSc_yZn_yTi(2-x-2y)Si_Xp_(3-x)O_(12) system based on LItI_2(PO_4)_3 were prepared by solid phase reaction at high temperature (1000～1300℃) for about 30 h using refined natural kaolinite and Sc_2O_3. The X-ray diffraction analysis shows that a Nasicon-like structure with R3c space group can be found in the composition range of x = 0.1, 0.2, y≤0.2. The maximum lithium ion conductivity is 1.19 x 10~(-4) S·cm~(-1) for the composition with x=0.1, y = 0.08 at room temperature, and its activation energy is 30. 6 Kj·mol~(-1) in the temperature range of 150 ～ 300℃. The systems with these compositions have high conductivity of about 10~(-2) S·cm~(-1) at 300℃.