Sol-gel synthesis and lithium ion conduction properties of garnet-type Lib>6b>BaLab>2b>Tab>2b>Ob>12b>

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• 作者：I. Kokal^a ; ^{i.kokal@tue.nl} ; K.V. Ramanujachary^b ; P.H.L. Notten^a ; H.T. Hintzen^a
• 关键词：A. Inorganic compounds ; B. Sol&ndash ; gel chemistry ; C. Impedance spectroscopy ; C. X-ray diffraction ; D. Ionic conductivity
• 刊名：Materials Research Bulletin
• 出版年：2012
• 期刊代码：60_00255408
• 类别：ms
• 出版时间：August, 2012
• 卷：47
• 期：8
• 页码：1932-1935
• 文件大小：1148 K

摘要

High lithium ion conductive garnet-type barium lanthanum lithium tantalate, Lib>6b>BaLab>2b>Tab>2b>Ob>12b> (LLBTO), was prepared by a modified sol-gel Pechini method from the appropriate mixtures of lithium carbonate, lanthanum oxide, barium carbonate and tantalum ethoxide. The thermal decomposition of the precursor powder was investigated by TG/DTA analysis. The LLBTO precursor powders were annealed at various temperatures between 923 and 1123 K for 6 h in air. The transformation process from precursor powder to crystalline garnet-like phase was analyzed by X-ray powder diffraction (XRPD). The morphology of the powders annealed at various temperatures was investigated by scanning electron microscopy (SEM). The resultant pelletized Lib>6b>BaLab>2b>Tab>2b>Ob>12b>, prepared by sol-gel synthesis method, shows a total Li-ion conductivity of 1.69 脳 10^鈭? S/cm at 298 K and an activation energy is 0.40 eV. The ionic conductivities reported in this study are slightly higher than those reported for LLBTO sample synthesized by conventional solid state synthesis route.