Journal
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY
Volume 143, Issue 1-3, Pages 14-20Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.mseb.2007.07.009
Keywords
garnet-like structure; solid-electrolyte; Li ion conductivity; ac conductivity; lithium ion batteries
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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.
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