The relationship of the thermal stability of BSB and BOB salts of alkali metals and ammonium with the electrochemical properties of their solutions in aprotic dipolar solvents

Abstract

The energy of the salt crystal lattice is one of the factors that affects the degree of salt dissociation and the enthalpy and entropy characteristics of electrolyte solutions. They form the thermodynamic parameters of these solutions and their ability to participate in ion transport. Therefore, in order to further study these properties, it was necessary to establish the thermal properties of BOB and BSB salts of alkali metals and ammonium. The stability of the electrolyte system is greatly influenced by the presence of phase transformations and chemical reactions in the salt component of the electrolyte. The most informative physico-chemical method that makes it possible to determine the presence of these transformations are the methods of differential thermal (GTA) and thermogravimetric analysis (TGA). Electrical conductivity and viscosity are strongly related, since it is the viscosity that determines the nature of the movement of charge carriers. Viscosity and electrical conductivity vary symbiotally. The minima and maxima on the viscosity–temperature curve correlate with those on the temperature–conductivity curve. When considering the temperature-concentration dependence of BSB salts, the viscosity value correlates with the electrical conductivity value. This is particularly evident in the example of the concentration and temperature electrical conductivities of KBSB and NaBSB in DMFA. It has been established that potassium salts have a greater dependence of electrical conductivity on concentration than sodium salts. When considering the triple diagrams of the dependence of viscosity and electrical conductivity on temperature, it was found that electrical conductivity is a function of temperature.