In Situ Ionic/Electric Conductivity Measurement of La[sub 0.55]Li[sub 0.35]TiO[sub 3] Ceramic at Different Li Insertion Levels

Abstract

The electrical conductivities of solid electrolytes at different Li intercalation levels were measured, in situ, using a special cell and electrode design. The relative changes in electrical conductivities of at different Li insertion levels in liquid electrolytes were monitored by the voltage across the powder disk electrode sandwiched between two nickel screens and charged only on one nickel screen. The real electrical conductivities of the ceramic at different Li insertion levels x without influence of high-ion-conductivity liquid electrolytes was measured by electrochemical impedance spectroscopy using sintered disk electrodes with Au coating on both sides. Lithium was electrochemically inserted into when the Au coated disk electrodes were immersed into liquid electrolytes with the cell inverted. The impedances of electrodes were then measured with the disk electrode suspended above the liquid electrolyte with the cell upright. © 2004 The Electrochemical Society. All rights reserved.