In response to increasing energy demands, absorption heat transformers (AHTs) have been widely employed as efficient energy conversion devices across various fields. However, existing working pairs (e.g., LiBr/H2O and NH3/H2O) exhibit high corrosiveness and limited thermal stability, significantly restricting their applicability in high-temperature environments. Therefore, the development of high-performance working pairs is crucial for improving the efficiency and stability of AHT systems. In this study, four groups of ionic liquid-based ternary matrix pairs: LiBr-[EMIM]Cl/H2O (1:2), LiBr-[EMIM]Cl/H2O (1:3), LiBr-[EMIM][DEP]/H2O (1:3), and LiBr-[EMIM][DMP]/H2O (1:3), were systematically evaluated through short-term corrosion experiments. The effects of corrosiveness, thermal stability, density, viscosity, and specific heat capacity were analyzed. Experimental results and data analysis clarified the high-temperature properties of ionic liquids, while thermogravimetric analysis and viscosity measurements were conducted to evaluate the relative merits of different working pairs. Results indicate that the LiBr-[EMIM]Cl/H2O (1:2) system exhibits the lowest corrosiveness and good thermal stability, making it suitable for corrosion-sensitive AHT systems, while the LiBr-[EMIM][DMP]/H2O (1:3) system demonstrates optimal thermal stability at high temperatures, rendering it a complementary solution for high-temperature applications. This study establishes an experimental basis for optimizing AHT working pairs and provides essential data to inform their selection in AHT systems.
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