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Physical and Electrochemical Properties of Acid 1-Methyl-3-Ethylimidazolium Chloride/AlCl_3/LiAlCl_4 molten salt

International Journal of Minerals,Metallurgy and Materials 2000年第4期14卷 286-291页

作者： Ying Sing Fung, Ruqi Zhou ( Department of Chemistry, The University of Hong Kong, Hong Kong, China Department of Inorganic and Non-metal Materials, University of Science and Technology Beijing, Beijing 100083, China) Department of Chemistry University of Hong Kong Hong Kong Hong Kong Department of Inorganic and Non-metal Materials University of Science and Technology Beijing Beijing 100083 China

An acid molten salt was formed by means of mixing 1 -methyl- 3 -ethylimidazolium chloride with AlCl3 and LiAlCl4 at ambient temperature. The solubility of LiAlCl4 in the acid molten salt was measured. Variations of specific conductivity, density and kinetic viscosity of molten salt with mole ratio o f MeEtlmCl/A1lCl3/LiAlCl4 were observed. A solubility maximum of LiAlCl4 with 5 4% in molar fraction was shown at a mole ratio of AlCl43/MeEtlmCl = 1 .2. An increase in density and viscosity, and a decrease in specific conductivity were found with increasing the concentrations of LiAlCl4 and AlCl3. The dependence of specific conductivity of this acid molten salt upon temperature was found to display Vogel-Tammanm-Fucher behavior. However, Arrhenius behavior was observed at two special mole ratios of MeEtImCl/AlCl3/LiAlCl4 = 1:1.5:0.05 and 1. 1.5:0. 10. The conductivity equations of this molten salt at various compositions were constructed. The ion interaction in the acid molten salt was studied using 7Li and 27Al nuclear magnetic resonance spectroscopic methods. The effect of concentrations of LiAlCl4 and AlCl3 on the ion interaction was also discussed.

关键词： Li-7 NMR Al-27 NMR room temperature molten salt aluminum chloride lithium tetrachloroaluminate physical property electrochemical property Materials

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