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 MoS 2 were prepared by controlled CVD growth processes. Graphene/MoS 2 alternately stacked structure (GMASS) was subsequently fabricated by alternately stacking graphene and MoS 2 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/MoS 2 heterostructures for high-energy LIBs. Image 1 • Graphene/MoS 2 alternately stacked structure (GMASS) was fabricated. • GMASS demonstrates an obviously reduced working voltage. • GMASS shows a higher volumetric capacity comparing with graphite anode. [ABSTRACT FROM AUTHOR]