High-Pressure High-Temperature Synthesis of MoS₂/Holey Graphene Hybrids and Their Performance in Li-Ion Batteries

Hybrids of holey graphene (HG) and MoS₂ have been prepared by a treatment of few-layered HG and amorphous MoS₃, taken in a weight ratio of ≈5 and ≈10%, at 100 bar and 600 °C under vacuum. A study of the products by electron microscopy, X-ray diffraction, Raman scattering, and X-ray photoelectron spectroscopy has detected coating of graphene stacks by thin MoS₂ layers. The near-edge X-ray absorption fine structure spectroscopy has revealed a covalent bonding between MoS₂ and HG components. A hybrid with 5 wt.% of MoS₂ showed a better rate capability for Li-ion intercalation/deintercalation as compared to the isolated HG and a hybrid with a higher MoS₂ loading. Owing to the electrochemical impedance spectroscopy measurements, this was attributed to a faster charge transport in the hybrid with the thin MoS₂ coating.