摘要采用溶胶-凝胶方法制备了固体锂离子导体陶瓷Li0。33La0。557-2/3xSrxTiO3、(Li0。33La424Sr0。2)1-yTi1-yWyO3、(Li0。33La0。424Sr0。2)1+z/2Ti1-zAlzO3。使用XRD、TG-DTA和复阻抗谱等技术对产物的物相结构和电导性能进行表征，研究掺杂元素及掺杂量对产物结构、致密度和电性能的影响规律及物理机制。结果表明：对于Li0。33La0。557-2/3xSrxTiO3 (x = 0。0, 0。05, 0。1, 0。15, 0。2, 0。3)导电陶瓷而言，当x的值在0。00~0。30范围内，为单相钙钛矿结构，单斜、四方晶系，晶格间距减小。而随着x变化，此钙钛矿的致密性增大，另外随之影响电导率基本趋势也增加。当La3+出现缺位时，LLSTO总电导率随着La3+的置换量量由x = 0。0增加到0。2，LLSTO的电导率呈现增加的趋势，当x = 0。3时又降低，当x=0。2时LLSTO的总电导率达到最大峰值，此时的Sr掺杂为陶瓷电化学性能最高点。对LLSTO的B位置换时，Al的置换量0。01~0。08范围内，其致密度随掺杂量增大而增大，电导率在Al=0。02时其电导率达到最大为1。83×10-3 Scm-1；另外一个B位置换元素W的置换也随置换量增大其致密度增加，晶格间距增大，电导率在W=0。025时最大。86716

毕业论文关键词：ABO钙钛矿；相结构；电导率；溶胶-凝胶法；Li0。33La0。557TiO3钙钛矿。

Abstract Used sol - gel method of preparing a solid lithium ion conductor ceramics Li0。33La0。557-2/3xSrxTiO3、(Li0。33La424Sr0。2)1-yTi1-yWyO3、(Li0。33La0。424Sr0。2)1+z/2Ti1-zAlzO3 Using XRD, TG-DTA and complex impedance spectroscopy technique phase structure and conductivity properties of the products were characterized by elemental doping and the structure of the product, density and electrical properties and physical mechanisms of influence of doping。 The results show, for Li0。33La0。557-2 / 3 xSrxTiO3 (x = 0。0, 0。05, 0。1, 0。15, 0。2, 0。3) conductive ceramics, when the value of x in the 0。00 to 0。30 range for single-phase perovskite structure, monoclinic, tetragonal lattice spacing decreases。 With x changes, this dense perovskite increased, along with additional conductivity affect the underlying trend has also increased。 When a vacancy occurs La3+, La3+ LLSTO total conductivity with the substitution amount by the amount of x = 0。0 to 0。2, LLSTO tended to increase the conductivity, reducing time and when x = 0。3, when x = 0。2 when the LLSTO the total conductivity reaches a maximum peak at this time of Sr doped ceramic electrochemical properties of the highest point。 When the B LLSTO position transducer, the displacement amount of Al, 0。01 to 0。08 range, the density increases with the doping amount, the conductivity at Al = 0。02 when the conductivity reaches its maximum is 1。83×10-3 Scm-1; another element B position transducer W substitution also increases with the amount of displacement increase their density, lattice spacing increases, the conductivity in W = 0。025 maximum。

Keywords:ABO perovskite, Phase structure, Conductivity, Sol - gel method, Li0。33La0。557TiO3 perovskite

目录

第一章  绪论 1

1。1 引言 1

1。2 ABO型结构介绍 2

1。3钙钛矿类固体电解质的制备与现状 2

1。3。1ABO型钙钛矿氧化物的研究现状及展望 2

1。3。2 溶胶-凝胶合成法 3

1。4 研究目的与意义 4

第二章  实验材料的制备及性能测试 6

2。1 实验原料 6

2。2 实验主要用到的仪器及设备