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

• Published in: Journal of the Electrochemical Society Vol. 144; no. 6; pp. L167 - L169
• Main Authors: BIRKE, P, SCHARNER, S, HUGGINS, R. A, WEPPNER, W
• Format: Journal Article
• Language: English
• Published: Pennington, NJ Electrochemical Society 01.06.1997
• Subjects: Chemistry; Electrochemistry; Exact sciences and technology; General and physical chemistry; Properties of electrolytes: conductivity; Quaternary compound; Stability; Perovskite type compound; Electrical properties; Ionic conductivity; Solid electrolyte; Lanthanum Oxides; Lithium Oxides; Insertion; Diffusion coefficient; Experimental study; Titanium Oxides
• ISSN: 0013-4651; 1945-7111
• DOI: 10.1149/1.1837713

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.