3D core-shell MoS2 superspheres composed of oriented nanosheets with quasi molecular superlattices: mimicked embryo formation and Li-storage properties

Monodispersed 3D core-shell superspheres consisting of oriented MoS2 nanosheets have been successfully synthesized on the large scale with a one-pot approach combining soft-and self-templated methods. Specifically, MoOx (x = 2-3) nanoclusters and MoS2 layers first self-assemble together with (CTAB)(2)S-y (y = 1 or 2) to form solid hybrids, MoOx-MoS2@(CTAB) 2Sy spheres at 160 degrees C, and most of the MoOx nanoclusters then convert to MoO2 and 2H-MoS2 at 180 and 200 degrees C, respectively. 3D core-shell superspheres can be finally constructed with 2H/1T-MoS2 nanosheets with abundant O-dopants and defects at 220 degrees C. The expanded d-spacings of the (002) crystal plane reveal the formation of quasi molecular superlattices for partially intercalating (CTAB) 2S molecules into 2D MoS2 nanosheets. The dynamic composition and nano/microstructural evolution of the materials in a one-pot reaction demonstrates a mimicked embryo formation based on in situ anion-exchange. The 3D core-shell superspheres can be applied to assemble anodes for lithium ion batteries (LIBs) with excellent performance, after being coated with reduced graphene oxide (RGO).