The sorption thermal energy storage has drawn burgeoning attention due to the high energy storage density

long-term heat storage capability and flexible operating modes. A novel thermochemical temperature-lifting system is established for the integrated energy storage and energy upgrade of low-grade thermal energy based on thermochemical temperature-lifting resorption technology. The resorption working pair MnCl2-CaCl2-NH3 is selected to investigate the performance of the energy storage cycle theoretically and experimentally. Results indicate that the highest thermal storage density and latent/sensible heat ratio are 614 kJ·kg-1 and 0.418 when the heat charging and discharging temperature are 135℃ and 140℃

respectively. The highest heat storage efficiency is 28.57% when the heat charging and discharging temperature are 125℃ and 130℃. The experiments verify the feasibility of the system for utilizing the low-grade thermal energy.