Abstract
The effect of SO 2 on the transport properties of LiBr in acetonitrile is studied by conductometric measurements. The specific conductivity of a 0.08 M LiBr solution rises ca. 2.5 fold upon the addition of 0.4 M SO 2. The physical properties of the solvent, the equivalent conductivity, the Walden number change but insignificantly in this SO 2 concentration range, whereas the association constant decreases considerably. It is concluded that the ion-dipole interaction Br − + SO 2 = SO 2.Br −, which raises the concentration of the conducting species and consequently lowers the apparent association constant, is basically responsible for the enhancement of the specific conductivity of LiBr in the mixed solvent acetonitrile with SO 2, used currently in practical Li/SO 2 batteries.
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