Journal
ELECTROCHIMICA ACTA
Volume 225, Issue -, Pages 345-349Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.12.140
Keywords
Li7La3Zr2O12; cubic structure; Ti substitution; ionic conductivity
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Funding
- National Basic Research Program of China (973 program) [2015CB656401]
- Natural Science Foundation of China [51372191, 51102189]
- International Science and Technology Cooperation Program of China [2011DFA52680]
- program for New Century Excellent Talents in University [NCET-11-0685]
- Key program of Natural Science Foundation of China [50932004]
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Solid electrolyte Li7La3Zr2-xTixO12 (x = 0, 0.1, 0.2, 0.3, 0.4 and 0.5) ceramics have been prepared via a conventional solid-state reaction. X-ray diffraction (XRD) analysis confirms that all samples formed a single phase with cubic garnet structure within the limit of instrument measurement, and with increasing Ti content from x = 0 to 0.5, the intensity of diffraction peaks exhibits a tendency of weakening. It is found that Ti doping in Li7La3Zr2O12 (LLZ) can lead to the increase of the densification, which is favorable to improve the ionic conductivity. Finally, optimized conductivity has been obtained for the sample with x = 0.3 for lithium ion battery: the total ionic conductivity reaches a maximum of about 4.16 x 10 (4) S cm (1) at 30 degrees C with an activation energy of about 0.48 eV. XRD analysis and cyclic voltammetry experiments on cells indicate the Li(7)La(3)Zr(2-x)TixO(12) pellet is stable with lithium metal. (C) 2016 Elsevier Ltd. All rights reserved.
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