TEMPERATURE-DEPENDENCE OF THE PROPERTIES OF ELECTROLYTE-SOLUTIONS .3. CONDUCTANCE OF VARIOUS SALTS AT HIGH-CONCENTRATIONS IN PROPYLENE CARBONATE AT TEMPERATURES FROM -45-DEGREES-C TO +25-DEGREES-C

Specific conductances of Et//4NPF//6, Pr//4NPF//6, Bu//4NPF//6, LiPF//6, KPF//6, LiClO//4, and KSCN in propylene carbonate were studied at high concentrations in the temperature range from plus or minus 25 degree C to minus 45 degree C. Data are fitted by a least-squares method to a four-parametric empirical equation, yielding the maximum specific conductance K(max) and the corresponding concentration mu . Within the framework of a hydrodynamic model, the Stokes-radii of the ions and the solvent viscosity are found to be the most important conductance-determining parameters, affecting both K(max) and mu . Ionic association in solutions with propylene carbonate as the solvent is not of significant importance. Kinetic treatment of conductance yields temperature-dependent activation energies, but at any one temperature equal for all salts at concentration mu . This work is pertinent to high enrgy and low temperature batteries and electrolysis.