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HomeSolid State PhenomenaSolid State Phenomena Vol. 184Relaxation Model of Lithium Ions in the...

Relaxation Model of Lithium Ions in the Garnet-Like Li₅La₃Bi₂O₁₂Lithium-Ion Conductor

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Abstract:

The relaxation mechanism of lithium ions in Li₅La₃Bi₂O₁₂ electrolyte was investigated by internal friction (IF) method. A prominent relaxation-type IF peak was observed. From the shift of peak position with frequency, the activation energy of E=1.0-1.1 eV and the pre-exponential factor of relaxation time in the order of τ₀ =10^-25 ~10^-18 s were obtained if one assumes a distributed Debye relaxation process. These values of relaxation parameters strongly suggest the existence of interaction between the relaxation species (here lithium ions or vacancies). Basing on the coupling model, the values of E and τ₀ were determined as 0.5-0.6 eV and 10^-17 ~ 10^-15 s, which still deviated from the typical values for point defect relaxation. A new phenomenological model was used to describe the relaxation process, and the values of E and τ₀ were determined as 0.46 eV and 3.6×10^-14 s, which is in agreement with the typical values for point defect relaxation.

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Periodical:

Solid State Phenomena (Volume 184)

Pages:

116-121

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.184.116

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Online since:

January 2012

Authors:

Y.X. Gao, Zhong Zhuang, H. Lu, X.P. Wang, Qian Feng Fang

Keywords:

Internal Friction, Li₅La₃Bi₂O₁₂, Lithium Ion Conductor, Lithium Ion Diffusion

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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