Metallothermic-synchronous construction of compact dual-two-dimensional MoS₂-graphene composites for high-capacity lithium storage

Addressing structural degradation of two-dimensional materials is of vast significance for improving their energy storage efficiency and cyclability in alkali metal-ion batteries. Here we propose a one-step metallothermic-synchronous construction strategy of Mo+CS₂ =MoS₂ +C that can simultaneously generate crystalline MoS₂ wrapped by few-layer graphene, forming a compact dual-two-dimensional MoS₂-graphene core-shell structure. XPS analysis reveals that dual-two-dimensional components are connected by chemical bonding of C−S, which promotes electronic and ionic transport and accommodates volumetric change. Notably, electrochemical studies disclose the relationship between storage efficiency and electrode dynamics, as well as cycle stability and volumetric effect of MoS₂-graphene, where the improved electrode dynamics and volumetric efficiency enable high capacity (800 mAh g⁻¹) and excellent cyclability (550 mAh g⁻¹ after 500 cycles at 5.0 A g⁻¹) for reversible lithium storage. This facile and scalable fabrication strategy makes dual-two-dimensional composite materials potentially viable for the commercialization in high-capacity energy storage.