锂快离子导体Li_(1+2x+y)Al_xYb_yTi_(2-x-y)Si_xP_(3-x)O_(12)系统的研究  

New Lithium Fast Ion Conductors of Li_(1+2x+y)Al_xYb_yTi_(2-x-y)Si_xP_(3-x)O_(12) System

作　　者：张玉荣[1] 王文继[1] 

机构地区：[1]福州大学化学系,福州350002

出　　处：《无机材料学报》2001年第1期117-121,共5页Journal of Inorganic Materials

基　　金：国家自然科学基金资助项目!(59772043)

摘　　要：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．Refined natural kaolinite was used as a starting material for preparing new lithium fast ion conductors of Li1+2x+yAlxYbyTi2-x-ySixP3-xO12system by high temperature (950~1150℃) solid phase reaction for about 20h. The syntheses temperatures are lowered with increasing the value of x and y for the system. The X-ray powder diffraction shows that a Lisicon phase with R3c space group exists in the composition range of y=0.3, x≤0.4 and y=0.5, x≤0.3. The initial composition with y=0.3, x=0.1 possesses a maximum ionic conductivity of 2.45×10-2S/cm at 673K and its activation energy is 38.3kJ/mol in the temperature range of 473~673K.

关 键 词：锂快离子导体 Al-YB-LisiCon 高岭石 固体电解质 

分 类 号：O646.1[理学—物理化学] O614.111[理学—化学]