Fabrication of Ce₂S₃/MoS₂ composites via recrystallization-sulfurization method and their improved electrochemical performance for lithium-ion batteries

A simple and novel method based on recrystallization-sulfurization method has been developed to fabricate Ce₂S₃/MoS₂ composite and their structure, morphology and electrochemical performance is researched systematically. The Ce₂S₃/MoS₂ composite exhibit enhanced electrochemical performance compared with Ce₂S₃ and MoS₂. Among them, Ce₂S₃/MoS₂ composite has an initial reversible discharge capacity of 187.5 mAh g⁻¹, coulombic efficiency of 78.6% and a reversible capacity as high as 636.5 mAh g⁻¹, coulombic efficiency of 99.7% after 500 cycles at a current density of 100 mA g⁻¹ and the highest discharge capacity of 97.3 mAh g⁻¹ at a high current density of 1000 mA g⁻¹, showing the best reversible capacity and cycling performance. The results show that the compositing between MoS₂ and Ce₂S₃ can maintain the stability of the structure during the charge/discharge process and existence of Ce₂S₃ can enhance the electrical conductivity of Ce₂S₃/MoS₂ composite and further improves the reversible capacities, cycling performance and rate performance of Ce₂S₃/MoS₂ composite.