The use of chemical models is shown for the calculation of thermodynamic an
d transport properties of concentrated electrolyte solutions. Comparison is
made with empirical approaches.
Molecular ions with delocalized charges abolishing the concept of ionic poi
nt charges for the calculation of short range interactions are considered i
n the framework of chemical models.
Novel lithium salts for technical applications are presented and the influe
nce of electron withdrawing substituents at the anions on ion-pair formatio
n, conductivity and anodic stability limit is studied to illustrate the rol
e of molecular ions with delocalized charges.