Abstract
Li7La3Zr2O12-based compounds are today the most promising solid electrolytes for high-energy lithium and lithium–ion power sources. The solid electrolytes Li7–x–3yAlyLa3Zr2−xTaxO12 (x = 0.3–0.6, y = 0.05–0.20) were prepared by the sol–gel method. The effect of doping of Li7La3Zr2O12 in Zr and Li sublattices with tantalum (Ta5+) and aluminum (Al3+) on the crystal structure, morphology, and electrical conductivity of this compound was examined. The compounds obtained had the cubic structure (space group Ia-3d). The resistance of the solid electrolytes obtained was determined by the electrochemical impedance method. The compounds Li6.25Al0.15La3Zr1.7Ta0.3O12, Li6.3Al0.10La3Zr1.6Ta0.4O12, Li6.2Al0.10La3Zr1.5Ta0.5O12, and Li6.25Al0.05La3Zr1.4Ta0.6O12 have the maximal lithium-ion conductivity (~2.0 × 10–4 S cm–1 at 20°C). The heat treatment at 1150°C for 1 h is optimum for forming highly conducting and dense ceramic membranes. Symmetrical cells with Li electrodes show stable behavior in cycling. The solid electrolytes obtained can be used in lithium power sources.
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ACKNOWLEDGMENTS
The research has been carried out with the equipment of the Shared Access Center “Composition of Compounds” of the Institute of High Temperature Electrochemistry, Ural Branch, Russian Academy of Sciences.
Funding
The synthesis of the solid electrolytes and study of their composition, morphology, and electrical conductivity were financially supported by the Russian Foundation for Basic Research and Sverdlovsk oblast, project no. 20-43-660015. The behavior of the symmetric cell with Li was studied within the framework of state budget themes of the Institute of High-Temperature Electrochemistry, Ural Branch, Russian Academy of Sciences (research program no. 122020100210-9).
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Translated from Zhurnal Prikladnoi Khimii, No. 5, pp. 627–635, May, 2022 https://doi.org/10.31857/S0044461822050097
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Il’ina, E.A., Lyalin, E.D., Antonov, B.D. et al. Li7La3Zr2O12-Based Solid Electrolytes Codoped with Ta5+ and Al3+ Ions for Lithium Power Sources. Russ J Appl Chem 95, 689–697 (2022). https://doi.org/10.1134/S1070427222050093
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DOI: https://doi.org/10.1134/S1070427222050093