Facile synthesis of hybrid MoS2/graphene nanosheets as high-performance anode for sodium-ion batteries

Abstract

We report the facile synthesis of molybdenum disulfide (MoS2) nanosheets on graphene nanosheets (MoS2@GNSs) via simple thermal decomposition of ammonium tetrathiomolybdate in Ar-H2 atmosphere. When used as anode materials for sodium-ion batteries (SIBs), the as-prepared MoS2@GNSs electrode delivers reversible capacities of 389 and 383 mA h g−1 at current densities of 200 mA g−1 and 500 mA g−1 after 200 cycles, respectively, which is much higher than that of the MoS2 electrode (253 mA h g−1 after 171 cycles at 200 mA g−1). The superior sodium storage performance of MoS2@GNSs including excellent cycle stability and rate performance can be attributed to the introduction of graphene materials, which not only buffer the volume changes of MoS2 upon sodiation/desodiation but also improve the electrical conductivity.