Enthalpies of mixing of liquid ternary Co-Li-Sn alloys.

Andriy Yakymovych,Herbert Ipser,Hans Flandorfer,Siegfried Fürtauer

doi:10.1007/s00706-014-1284-8

Abstract

The partial and integral molar enthalpies of mixing of liquid Co–Li–Sn alloys were determined using drop calorimetry. The investigations were performed along six sections by the addition of lithium to mixtures with the compositions x_{text{Co}}/x_{text{Sn}} ≈ 2:98, x_{text{Co}}/x_{text{Sn}} ≈ 1:9, and x_{text{Co}}/x_{text{Sn}} ≈ 3:17 as well as by the addition of cobalt to mixtures with the compositions x_{text{Li}}/x_{text{Sn}} ≈ 3:17, x_{text{Li}}/x_{text{Sn}} ≈ 1:2, and x_{text{Li}}/x_{text{Sn}} ≈ 1:1 at a temperature of 1,173 K. The Co–Li–Sn system shows exothermic behavior of the integral molar enthalpy of mixing in the investigated concentration range. The integral molar enthalpy of mixing of liquid Co–Li system was calculated by Miedema’s model to fit our measured ternary data using an extended Redlich–Kister–Muggianu model for substitutional solutions.Graphical abstract

Highlights

The wide range of industrial applications of lithium-ion batteries (LIBs) initiated extensive research on existing battery elements and the development of new and alternative materials [1,2,3]
A reliable and consistent description of the ternary Co–Li–Sn system would be desirable for an understanding of the interaction of Li with anodes based on Co–Sn alloys
The Li–Sn alloys are in the liquid state over the whole concentration range at 1,173 K [42]; the starting compositions on the Li–Sn side were chosen over a large concentration interval: Li0.15Sn0.85, Li0.33Sn0.67, Li0.50 Sn0.50, and Li0.75Sn0.25

Summary

Introduction

The wide range of industrial applications of lithium-ion batteries (LIBs) initiated extensive research on existing battery elements and the development of new and alternative materials [1,2,3]. Abstract The partial and integral molar enthalpies of mixing of liquid Co–Li–Sn alloys were determined using drop calorimetry. The Co–Li–Sn system shows exothermic behavior of the integral molar enthalpy of mixing in the investigated concentration range.

Results

Conclusion