Fabrication of graphene/MoS2 alternately stacked structure for enhanced lithium storage

Graphene materials have attracted significant research interest as anodes in lithium-ion batteries (LIBs). However, their low volumetric capacity and high working voltage limit the energy density and thus hinder their practical applications. In this research, monolayer graphene and MoS2 were prepared by controlled CVD growth processes. Graphene/MoS2 alternately stacked structure (GMASS) was subsequently fabricated by alternately stacking graphene and MoS2 monolayers layer by layer. When evaluated as an anode for LIB, GMASS demonstrates an obviously reduced working voltage compared to monolayer graphene electrodes (1.31 V vs. 1.46 V). And its volumetric capacity is much higher than that of an average graphite anode (1260 mAh cm−3 vs. 461 mAh cm−3). This fundamental research could promote the development of graphene/MoS2 heterostructures for high-energy LIBs.