Ionic Conduction of Lithium Electrolyte Close to the Cathode Active Materials - LiCoO2 Powder/ Non-Aqueous LiClO4 Solution Coexisting Systems -

Abstract

The electrolyte conductivity was measured for the coexisting system containing the non-aqueous lithium electrolyte and lithium cobalt (III) oxide (LiCoO2) powder utilized as the cathode active material. The anomalous behaviors of the ionic conduction near the solid surface were discussed. The conductivity increased with an increase of the liquid content and depended on the solvents. The values of each system depend on the order of the conductivity of bulk systems. Below 15 vol% of the liquid phase, the values were similar as each others. The activation energy was relatively low (20-25 kJ/mol) and decreased with the decrease of the liquid phase for the system containing LiCoO2 powder, whereas the values increased for the system containing a-Al2O3 powder. The decrease phenomena of the activation energy were depends on the solvent species. The IR spectra showed the change of the solvation interaction between C=O bonding and Li+ ion.