Open AccessStructure and lithium-ion conductivity investigation of the Li7-xLa3Zr2-xTaxO12 solid electrolytes
Author(s) -
E. A. Il’ina,
E. D. Lylin,
Artem A. Kabanov
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1967/1/012011
Subject(s) - fast ion conductor , lithium (medication) , electrolyte , conductivity , ionic conductivity , materials science , tantalum , ion , analytical chemistry (journal) , solid solution , chemistry , electrode , chromatography , medicine , organic chemistry , metallurgy , endocrinology
Currently solid electrolytes with high values of lithium-ion conductivity are required for creation high-energy lithium and lithium-ion power sources, including all-solid-state batteries. Compounds with a garnet structure based on Li 7 La 3 Zr 2 O 12 are promising solid electrolytes for such power sources. In presented work solid electrolytes in the Li 7-x La 3 Zr 2-x Ta x O 12 system were synthesised using the sol-gel method in a wide concentration range of tantalum from x=0 to x=2.0. According to X-ray diffraction analysis, compounds with x > 0 has a cubic modification with the space group Ia-3d. The electrical resistance of the obtained solid electrolytes was measured by the complex impedance method in the temperature range of 25-210 °C, and the values of total lithium-ion conductivity were calculated. It was found that Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 has the maximum values of lithium-ion conductivity in studied system – 1.4•10 −4 S/cm at 25 °C. The Density Functional Theory modeling confirms that moderate Ta-doping is most suitable for enhancing of Li diffusion.