锂快离子导体Li_(1.4)Al_(0.1)Mg_(0.1)Ti_(1.8)Si_(0.1)P_(2.9)O_(12)和Li_(1.8)Al_(0.1)Mg_(0.1)Ti_(1.6)Si_(0.3)P_(2.9)O_(12)的合成及导电性能研究  

Synthesis and Electric Properties of Lithium Fast Ion Conductors Li_(1.4)Al_(0.1)Mg_(0.1)Ti_(1.8)Si_(0.1)P_(2.9)O_(12) and Li_(1.8)Al_(0.1)Mg_(0.1)Ti_(1.6)Si_(0.3)P_(2.9)O_(12)

作　　者：张保柱[1] 畅功民[2] 张志强[1] 李军平[1] 张智敏[1] 

机构地区：[1]山西大学化学化工学院,山西太原030006 [2]山西省农业科学院,山西太原030031

出　　处：《精细化工》2006年第9期845-848,共4页Fine Chemicals

基　　金：山西省自然科学基金资助项目(20041016)~~

摘　　要：以LiTi2(PO4)3为基,用分析纯原料经高温固相反应(850、900、950℃)制得锂快离子导体材料Li1.4A l0.1Mg0.1Ti1.8Si0.1P2.9O12(以下简称TM1)和Li1.8A l0.1Mg0.3Ti1.6Si0.1P2.9O12(以下简称TM2)。用交流阻抗技术测定了合成物的电导率。反应温度为850、900和950℃合成的TM1在298 K测定的电导率分别为1.05×10-4S/cm,1.11×10-4S/cm,1.31×10-4S/cm;同样条件下合成的TM2的电导率分别为7.41×10-5S/cm,7.81×10-5S/cm,8.11×10-5S/cm。以上数据表明,TM1和TM2的离子电导率随着合成温度的升高而增大。在373、473、573和673 K测定的离子电导率也呈上述趋势。反应温度为950℃的合成物的电导率最高,反应温度为850℃的合成物的离子电导率最低,因此,TM1和TM2的最佳合成温度为950℃。T≥100℃时,TM2的离子电导率比TM1的大。X射线衍射分析结果表明,TM1和TM2在不同的反应温度(850、900、950℃)下均得到空间群为R3c的合成物。Pure analytic reagents were used to prepare new lithium fast ion conductors Li1.4A10.1 Mg0. Ti1.8 Si0.1 P2.9O12 （TM1） and Li1. 8Al0.1Mg0. 3Ti1. 6Si0.1 P2.9O12（ TM2 ） by high temperature （ 850,900 and 950 ℃ ） solid phase reaction. The ionic conductivities of TM1 and TM2 were measured by AC impedance method at 298 K. The conductivities of TM1 synthesized at 850,900 and 950 ℃ are 1.05 × 10^-4 S/cm,1.11 × 10^-4 Scm and 1.31 × 10^-4 S/cm,and those of TM2 are 7.41 × 10^-5 S/cm,7. 81 × 10^-5 S/cm and 8. 11 × 10^-5 S/cm, respectively. The data indicate that the conductivities of TM1 and TM2 rise with the reaction temperature. The conductivities measured at 373,473,573 and 673 K have the same trend ：the conductor synthesized at 950 ℃ has the highest conductivity,while that, synthesized at 850℃ has the lowest conductivity. The temperature of 950 ℃ is fit for preparing TM1 and TM2. At T ≥t 100 ℃ ,the conductivities of TM2 are bigger than those of TM1. X-ray powder diffraction shows that a Lisicon phase with space group exists in the conductors which were prepared at different hightemperatures.

关 键 词：锂快离子导体 合成温度 掺杂 电导率 

分 类 号：O646.1[理学—物理化学]