Electrochemical characterization of sulfur with low depth of charge/discharge in lithium sulfur batteries
Abstract In this research, a narrow charge/discharge electrochemical window is enforced for lithium sulfur batteries. In this way, the active material of the electrode (which is sulfur in the initial state) is limited to Li 2 S 8 and Li 2 S 3 leading the electrochemical reactions to take place in the liquid phase and thereby improving the capacity performance and cycling performance. After 50 cycles at a current density of 0.1 mA cm 2 the specific capacity obtained using a narrow electrochemical window (1.95 2.45 V) (490 mAh g 1 was greater than that obtained using a wide electrochemical window (1.7 2.8 V) (435 mAh g 1 This finding demonstrates the feasibility of improving the electrochemical performance by employing a suitable electrochemical window to restrain the phase transformation to the middle liquid phase.