Trapping polysulfide on two-dimensional molybdenum disulfide for Li-S batteries through phase selection with optimized binding

Introducing anchoring materials into cathodes for Li-S batteries has been demonstrated as an effective way to overcome the shuttle effect and enhance the cycling stability. In this work, the anchoring effects of 2H-MoS and 1T'-MoS monolayers for Li-S batteries were investigated by using density functional theory calculations. It was found that the binding energies of Li S absorbed on 1T'-MoS monolayer are in the range of 0.31-2.94 eV, which is much higher than on the 2H-phase. The 1T'-MoS monolayer shows stronger trapping ability for Li S than the 2H-MoS monolayer. The 1T'-MoS monolayer can be used as effective anchoring material in cathodes for Li-S batteries.