A 3D Multilevel Heterostructure Containing 2D Vertically Aligned MoS Nanosheets and 1D Sandwich C-MoS-C Nanotubes to Enhance the Storage of Li Ions.

To overcome the disadvantages of the MoS anode for LIBs in terms of low intrinsic conductivity, poor mechanical stability, and adverse reaction with electrolytes, a 3D multilevel heterostructure (VANS-MoS-CNTs) has been successfully prepared by a simple hydrothermal method followed by thermal treatment. VANS-MoS-CNTs are made up of 2D vertically aligned MoS nanosheets (VANS) and 1D sandwich C-MoS-C nanotubes (CNTs). The sandwich-like nanotube is the core part, which is made up of the MoS nanotube covered by carbon layers on both side surfaces. Due to the special heterostructure, VANS-MoS-CNTs have good conductivity, high structured stability, and excellent Li/electron transport, resulting in high discharge capacity (1587 mAh/g at a current density of 0.1 A/g), excellent rate capacity (1330 and 730 mAh/g at current densities of 0.1 and 2 A/g, respectively), and good cyclic stability (1270 mAh/g at 0.1 A/g after 100 cycles).