Abstract
The phase diagram of Li 2SO 4LiCl has been determined by means of differential thermal analysis, DTA. The electrical conductivity has been measure for 2.5 to 33.3 mol% Li 2Cl 2, and a pronounced change is obtained at 575°C, i.e. the temperature of the monoclinic-cubic transition of Li 2SO 4. The self-diffusion coefiicient is approximaately one order of magnitude larger for lithium ions than for chloride ions. The system is a simple eutectic with the eutectic point at 484°C and 44 mo1% Li 2Cl 2. The solubility of LiCl in Li 2SO 4 is very small, but a plastic paste is formed in the two-phase regions. This makes mixtures with a low content of LiCl of interest both as electrolytes in power sources and for the storage of thermal energy in the vicinity of the solid-solid phase transition at 575°C. The system Li 2SO 4LiBr has been studied regarding electrical conductivity as well as the diffusion of lithium and bromide ions, and it is evident that the two sulphate-halide systems are very similar.
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