Graphite as conduction modifier for copper superionic glasses [articol]

Abstract

Cu+ conducting glasses were prepared in the Cu2O-MoO3-P2O5 system. These glasses, known for their high ionic conductivity, are promising in applications to solid state batteries and other energy storage devices.The amorphous state of the samples has been confirmed through X-ray diffraction. The electronic conductivity was measured by means of the Wagner polarization method. Colloidal graphite has been used in order to maintain a reducing medium, necessary to stabilize the copper at the lower state of valence. The variations of the conductivity, activation energy and transference number vs. the graphite amount has been investigated. The records show a constant rise until 1 % wt. graphite. Once this amount has been exceeded, the conductivity drops bellow that of the sample without graphite.