Electrochemical properties of glasses in the TeO2−V2O5 system
Telluro-vanadate glasses are investigated to be used as positive electrode in vitreous solid state lithium batteries. Compositions between 20 and 70 mol% in V2O5 have been synthesized. Electrical conductivity measurements have been carried out confirming the increase in the electronic conductivity with the V2O5 content. The electrochemical intercalation of lithium has been studied by either coulometric titration or cyclic voltammetry. The open circuit voltage of the following solid state cell: Li(metal)/(PEO)8LiClO4 (electrolyte)/TeO2−V2O5 (glass composite electrode) is higher than 3.5 V at 80°C and remains higher than 2.5 V for lithium intercalation ratio lower than 0.5 lithium atom per vanadium atom.