Electrolytic stability limit and rapid lithium insertion in the fast-ion-conducting Li0.29La0.57TiO3 Perovskite-type compound

The lithium-rich limits of the electrolyte stability window of the fast-ion-conducting defect perovskite Li0.29La0.57TiO3 was found to be about 1.7 V vs Li at 24 C. The coulometric titration curve was determined, indicating that reversible insertion/extraction of 0.14 additional Li, corresponding to...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 1997-06, Vol.144 (6), p.L167-L169
Main Authors: BIRKE, P, SCHARNER, S, HUGGINS, R. A, WEPPNER, W
Format: Article
Language:English
Subjects:
Chemistry
Electrochemistry
Exact sciences and technology
General and physical chemistry
Properties of electrolytes: conductivity
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Summary:The lithium-rich limits of the electrolyte stability window of the fast-ion-conducting defect perovskite Li0.29La0.57TiO3 was found to be about 1.7 V vs Li at 24 C. The coulometric titration curve was determined, indicating that reversible insertion/extraction of 0.14 additional Li, corresponding to the complete occupation of the vacant A-sites, is possible. The galvanostatic intermittent titration technique was used to evaluate the chemical diffusion coefficient as a function of composition. It was very high, and varies less than a half-order of magnitude over this stoichiometry range. Values of D greater than 10 exp(-7) cm2/s were found both for lithium insertion and for lithium extraction. This is one of the highest diffusion coefficients observed in a lithium-conducting insertion-reaction oxide. 9 refs.
ISSN:0013-4651
1945-7111
DOI:10.1149/1.1837713