PVP incorporated MoS as a Mg ion host with enhanced capacity and durability

MoS 2 with enlarged interlayer spacing exhibits high Mg-ion storage capacity due to the accelerated kinetics of Mg 2+ , however, continuous decay of capacity occurs during the charge/discharge process, and the exfoliation of MoS 2 monolayers is observed because of the weakened van der Waal's interaction in MoS 2 interlayers. In the present study, PVP-MoS 2 nanospheres with an interlayer spacing of 0.97 nm are synthesized by a hydrothermal method, and employed as Mg-ion hosts. The characterization of MoS 2 interlayers indicates that PVP is incorporated between MoS 2 monolayers, and the former interacts with the latter to sustain the layered structure of nanospheres. PVP-MoS 2 shows a capacity of 143.4 mA h g −1 at a current density of 20 mA g −1 , and retains 92% of the capacity after 100 cycles due to its strong structural stability. This study provides a feasible approach to prepare MoS 2 hosts with enhanced capacity and durability. A PVP incorporated MoS 2 host with enhanced durability due to the role of PVP in tightly bridging MoS 2 monolayers.