锂快离子导体Li{1+2x+yAlxYbyTi2-x-ySixP3-xO12系统的研究

• 作 者: 张玉荣 王文继
• 机 构: 福州大学化学系!福州350002,福州大学化学系!福州350002
• 出 处: 无机材料学报
• 发表日期: 2001年01期
• 关键词: 锂快离子导体 Al-Yb-Lisicon 高岭石

以ＬｉＴｉ２（ＰＯ４）３为基以天然高岭石为起始原料，经高温固相反应（９５０～１１５０℃）制得了 一系列锂快离子导体材料Ｌｉ１＋２ｘ＋ｙＡｌｘＹｂｙＴｉ２－ｘ－ｙＳｉｘＰ３－ｘＯ１２（以下简称Ａｌ－Ｙｂ－Ｌｉｓｉｃｏｎ）．系统 的合成温度随ｘ和ｙ值的增大而降低．应用交流阻抗技术测定的电导率数据结果表明ｙ＝０．３， ｘ＝０．１的合成物的电导率最好，４００℃时电导率达２．４５×１０－２Ｓ／ｃｍ， ２００～４００℃内的电导激 活能为３８．３ｋＪ／ｍｏｌ．ＸＲＤ分析结果表明在ｙ＝０．３，ｘ≤０４及ｙ＝０．５，ｘ≤０．３的组成范围内 均能得到空间群为Ｒ３ｃ的合成物．

LiTi2 (PO4) 3-based natural kaolinite was used as a starting material to prepare a series of lithium fast ion conductor materials Li1 + 2x + yAlxYbyTi2-x-ySixP3-xO12 (hereinafter referred to as Al- Yb-Lisicon). The system synthesis temperature decreases with increasing x and y values. The results of conductivity data measured by AC impedance technique show that the conductivity of the composite with y = 0.3 and x = 0.1 is the best, the conductivity is 2.45 × 10-2 S / cm at 400 ℃, The conductance activation energy is 38.3kJ / mol. The XRD results show that the space group R3c can be obtained in the compositional range of y = 0.3, x≤04, y = 0.5, x≤0.3.