Ionic conductivity, lithium insertion and extraction of lanthanum lithium titanate

Authors
Citation
Ch. Chen et K. Amine, Ionic conductivity, lithium insertion and extraction of lanthanum lithium titanate, SOL ST ION, 144(1-2), 2001, pp. 51-57
Citations number
19
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
SOLID STATE IONICS
ISSN journal
0167-2738 → ACNP
Volume
144
Issue
1-2
Year of publication
2001
Pages
51 - 57
Database
ISI
SICI code
0167-2738(200109)144:1-2<51:ICLIAE>2.0.ZU;2-4
Abstract
The lithium ionic conductivity and electrochemical stability of perovskite La2/3-xLi3xTiO3 (LLTO) have been determined with AC impedance spectroscopy, cyclic voltammetry and galvanostatic cycling. Ionic conductivity of La0.55 Li0.35TiO3 and La0.57Li0.29TiO3 pellets sintered from four different powder s was measured in the temperature range from 30 to 110 degreesC. Bulk condu ctivity was found to be closely related to the calcination temperature of t he powders. Pellets from 1100 degreesC-calcined powders had higher bulk con ductivity than from 1200 degreesC-calcined powders. The grain-boundary cond uctivity was mainly determined by the sample composition. The activation en ergies were 0.14-0.18 eV for bulk conduction and 0.41-0.43 eV for grain-bou ndary conduction. Lithium was intercalated into LLTO below about 1.8 V vs. Li. With addition of acetylene black, about 0.48 Li was reversibly inserted into and extracted out of La0.55Li0.35TiO3. A phase transition is proposed to take place during the lithium insertion. Published by Elsevier Science B.V.