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无机材料学报

无机材料学报

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锂快离子导体Li1+2x+yAlxYbyTi2-x-ySixP3-xO12系统的研究

张玉荣; 王文继   

  1. 福州大学化学系, 福州 350002
  • 收稿日期:2000-04-07 修回日期:2000-05-08 出版日期:2001-01-20 网络出版日期:2001-01-20

New Lithium Fast Ion Conductors of Li1+2x+yAlxYbyTi2-x-ySixP3-xO12 System

ZHANG Yu-Rong; WANG Wen-Ji   

  1. Department of Chemistry; Fuzhou University; Fuzhou 350002; China
  • Received:2000-04-07 Revised:2000-05-08 Published:2001-01-20 Online:2001-01-20

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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．

关键词: 锂快离子导体, Al-Yb-Lisicon, 高岭石

Abstract: Refined natural kaolinite was used as a starting material for preparing new lithium fast ion
conductors of Li1+2x+yAlxYbyTi2-x-ySixP3-xO12 system 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.

Key words: Al-Yb-Lisicon, fast ion conductor, kaolinite

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