Exchange current densities at Li | Li7La3Zr2O12 interface

  • Evgenya Ilina Institute of High-Temperature Electrochemistry of Ural branch of Russian Academy of Science, Ekaterinburg
  • Petr Shevelin Institute of High-Temperature Electrochemistry of Ural branch of Russian Academy of Science, Ekaterinburg
  • Anton Raskovalov Institute of High-Temperature Electrochemistry of Ural branch of Russian Academy of Science, Ekaterinburg
Keywords: solid electrolyte, Li7La3Zr2O12, exchange currents, power source

Abstract

Solid electrolyte Li7La3Zr2O12 was synthesized by a citrate-nitrate technique. Single-phase of the synthesized compound was established by X-ray diffraction method. The pellets of Li7La3Zr2O12 were hydrostatic pressed at 500 MPa and annealed at 1180°C for 1 h. Absence of through porosity in the obtained samples was confirmed by a kerosene technique at room temperature. Symmetrical electrochemical cell with reversible lithium electrodes was assembled to determine the current exchange densities at Li | Li7La3Zr2O12 interface. Polarization curves were obtained by the linear potential sweep for the studied cell. The form of the obtained curves is close to the Tafel form. So, it was concluded that a rate-determining step in the system Li | Li7La3Zr2O12 | Li refers to the process of lithium transfer at the interface. From the obtained polarization curves exchange current densities was calculated. The exchange current densities reach values of 30 mA/cm2 at temperatures above 400°C. The obtained values of the current densities are sufficient for practical application of Li7La3Zr2O12 as solid electrolyte in primary and secondary lithium current sources.

Author Biographies

Evgenya Ilina, Institute of High-Temperature Electrochemistry of Ural branch of Russian Academy of Science, Ekaterinburg
Laboratory of Chemical Power Sources, Junior Researcher
Petr Shevelin, Institute of High-Temperature Electrochemistry of Ural branch of Russian Academy of Science, Ekaterinburg
Laboratory of Chemical Power Sources, Researcher
Anton Raskovalov, Institute of High-Temperature Electrochemistry of Ural branch of Russian Academy of Science, Ekaterinburg
Laboratory of Chemical Power Sources, Researcher

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Published
2014-10-31
How to Cite
Ilina, E., Shevelin, P., & Raskovalov, A. (2014). Exchange current densities at Li | Li7La3Zr2O12 interface. Chemical Bulletin of Kazakh National University, 75(3), 12-17. https://doi.org/https://doi.org/10.15328/chemb_2014_312-17
Section
Physical Chemistry and Electrochemistry