s‐MoO3/MoO2@C Hollow Tubes as Polysulfide‐Filter for Lithium‐Sulfur Batteries

Abstract Increasing the active sites to adsorb polysulfides and catalyze its conversion to Li 2 S/Li 2 S 2 is considered an effective approach to accelerate redox kinetics lithium‐sulfur (Li−S) battery. In this paper, shortened s‐MoO 3 /MoO 2 @C hollow tube with abundant adsorption/catalytic active sites is prepared by self‐etching/thermal reduction. Due to the abundant active sites and good Li + transport of the composite, the redox kinetics of polysulfides is enhanced. Under the condition of 1.56 mg cm −2 of sulfur loading and E/S=12 μL mg −1 , the activation energy for Li 2 S/Li 2 S 2 formation in Li−S cell is reduced to 14.08 kJ mol −1 , and the discharging specific capacity remains 488.4 mAh g −1 at 5 C.