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 Li2S/Li2S2 is considered an effective approach to accelerate redox kinetics lithium‐sulfur (Li−S) battery. In this paper, shortened s‐MoO3/MoO2@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 Li2S/Li2S2 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.