Facile Microwave-Impulse Synthesis of Multifunctional rGO/MoS<sub>2</sub>/MoO<sub>2</sub> Composites as a Permselective Separator-Coating Layer for Li–S Batteries
Bin Zhao, Cong Zhi, Zhi Cheng, Zhouting Sun, Boheng Yuan, Fei Shen, Xiaogang Han
Abstract
The commercial applications of Li–S batteries (LSBs) can be expanded by the development of shuttle effect-prohibiting multifunctional materials using high-efficiency and energy-saving methods. Here, we report a facile microwave-impulse-based method to synthesize multifunctional rGO/MoS2/MoO2 heterostructure characterized with lamellar MoS2/MoO2 heterojunctions attached to reduced graphene oxide (rGO) sheets. Microwaves can directly work on the precursor materials, and the preparation process can be completed in only 100 s. The rGO/MoS2/MoO2 composite could give strong chemisorption ability and excellent catalytic activity of lithium polysulfides (LPSs) while maintaining a relatively high conductivity from the rGO matrix. Moreover, permselective rGO/MoS2/MoO2 layers with numerous micron-size pores can trap polysulfide anions while promoting the diffusion of Li+, which is of great significance in efforts to improve the cycling stability and reaction kinetics of LSBs. A cell with an rGO/MoS2/MoO2-coated separator retains 62.1% of its capacity with a 0.12% capacity decay per cycle over 300 cycles at 0.5C. This work offers an innovative route for the rapid preparation of multifunctional separators for LSBs.