Interlayer Expanded MoS2/Nitrogen-Doped Carbon Hydrangea Nanoflowers Assembled on Nitrogen-Doped Three-Dimensional Graphene for High-Performance Lithium and Sodium Storage

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A combination of optimization methods has been developed to help compensate for the weak points of molybdenum disulfide (MoS 2 ), including poor electronic conductivity and large volume expansion, for better exhibiting its advantages such as high capacity and stability in the fields of lithium/sodium-ion batteries (LIBs/SIBs). In the study, nitrogen-doped three-dimensional graphene supporting MoS 2 hydrangea nanoflowers with a nitrogen-doped carbon intercalation (MoS 2 /NC@N3DG) hierarchical composite has been designed and prepared in a simple one-step hydrothermal and annealing way. The distinctly expanded spacing between MoS 2 interlayers can facilitate the ion diffusion and the doped nitrogen atoms can markedly improve the electronic conductivity. Therefore, the MoS 2 /NC@N3DG composite electrode shows outstanding rate capability and excellent cycling performance for both LIBs (1497/1300 mA h g –1 at 0.2/1 A g –1 after 200/500 cycles) and SIBs (513/364 mA h g –1 at 0.2/1 A g –1 after 200/500 cycles). This work provides a promising scheme for designing advanced two-dimensional layered metal dichalcogenide materials for high-performance LIBs and SIBs.