Structure and lithium ion conductivity of bismuth containing lithium garnets Li5La3Bi2O12 and Li6SrLa2Bi2O12

被引：92

作者：

Murugan, Ramaswamy

Weppner, Werner

Schmid-Beurmann, Peter

Thangadurai, Venkataraman

机构：

[1] Univ Kiel, Fac Engn, D-24143 Kiel, Germany

[2] Univ Munster, Inst Mineral, D-48149 Munster, Germany

[3] Univ Calgary, Dept Chem, Calgary, AB T2N 1N4, Canada

来源：

MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY | 2007年 / 143卷 / 1-3期

关键词：

garnet-like structure; solid-electrolyte; Li ion conductivity; ac conductivity; lithium ion batteries;

D O I：

10.1016/j.mseb.2007.07.009

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report the synthesis, structure and transport properties of the new chemical compositions Li5La3Bi2O12 and Li6SrLa2Bi2O12. Qualitative phase analysis by X-ray powder diffraction patterns in combination with the Rietveld method revealed garnet type compounds as major phases. Whereas Li5La3Bi2O12 was found to be a single-phase material, BiLa2O4.5 could be identified as an impurity phase in the case of Li6SrLa2Bi2O12. Lithium ion conductivities of Li5La3Bi2O12 and Li6SrLa2Bi2O12 were studied by ac impedance method. The grain-boundary contribution to the total (bulk + grain-boundary) resistance is appreciable and amounts to about 54% and 61% for Li5La3Bi2O12 and Li6SrLa2Bi2O12, respectively, at 22 degrees C. Li6SrLa2Bi2O12 exhibits the highest total (bulk + grain-boundary) and bulk ionic conductivity of 2.0 x 10(-5) and 5.2 x 10(-5) S/cm, respectively, at 22 degrees C. The bismuth containing lithium garnet exhibits a maximum cubic lattice constant and the best lithium ion conductivity with low activation energy in the Li5La3M2O12 (M = Ta, Nb, Sb and Bi) series. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：14 / 20

页数：7

共 30 条

[1] Fast Li-circle plus conducting ceramic electrolytes [J].