Batteries with a mixed pyrophosphates of lead and alkalis in vitreous state for use on storage energies

The challenge of this work is to prepare ceramics in the form of powders crystallized type Na_2-2xA_2xPbP₂O₇ (A = Li, K, Ag and 0 < x < 1) by the method glass. These different compositions will be characterized by different techniques such as X-ray diffraction, spectroscopy FTIR and thermal analyses ATD, ATG and DSC to determine their local structures. Indeed, the absorption bands appeared in the range of 714 - 970 cm^-1 are footprint P₂O₇ ^4- groups representing different degrees of freedom from those of PO₄ ^3- and PO₃ ^-. In addition, structures of pyrophosphate joint alkaline and transition element type of symmetry are triclinic. The entity [Pb₂P₄O₁₄]^4- form layers parallel to the plane (001). The sodium atom is located between these two layers. The study of crystal glass composition Na₂PbP₂O₇ at different speeds heating has been undertaken. We evaluated fractions crystallized glass at different temperatures and different speeds. Several models of calculation were applied to determine the activation energy of crystallization of glass diphosphate sodium. The thermal parameters obtained confirm that the crystallisation is predominant two-dimensional. The electrical properties due to the mobility of alkali ions are approached in connection with the structural buildings.