Electromotive force measurements (emf) were carried out over broad temperature range for liquid ternary Al-Li-Zn alloys. Partial excess thermodynamic functions of lithium: Gibbs energy, enthalpy and entropy in liquid Al-Li-Zn alloys were determined. These data were compared to modelled values obtained using Redlich-Kister-Muggianu (RMK) equation and the set of literature binary and ternary interaction parameters. Mixing Gibbs energy and enthalpy was also computed with the new set of ternary parameters optimized in this work and confronted to available experimentally determined data. (C) 2014 Elsevier B.V. All rights reserved.