Amorphous MoS2/MoO3 Nanosheets as High-Efficient Polysulfide Barrier in Li−S Batteries

Lithium-sulfur batteries (LSBs) are seriously impeded by poor reaction kinetics and the polysulfides shuttling, leading to low utilization of sulfur and poor cycling performance. Herein, amorphous MoS 2 /MoO 3 nanosheets are prepared by a one-step formamide (FA)-assisted strategy. Due to the merits of high adsorption capability and good catalytic activity of MoS 2 , relatively high electronic conductivity and strong polarity of MoO 3 , and abundant active sites of amorphous nanosheet structure, the LSBs based on amorphous MoS 2 /MoO 3 -2 nanosheets coated separator exhibit an outstanding specific capacity (1420.2 mA h g −1 at 0.1 C), excellent rate capacity (505.4 mA h g −1 at 5 C), and long cycle life (a negligible decay rate of 0.063 % per cycle at 0.5 C). This work provides an idea for designing efficient amorphous catalytic materials in LSBs. Graphical Amorphous MoS 2 /MoO 3 nanosheets with high adsorption capability, good catalytic activity, and abundant active sites are employed as high-efficient polysulfide barrier in Li−S batteries.