The exfoliation of bulk MoS2 by a three-roller mill for high-performance potassium ion batteries

Due to the large radius and the high diffusion barrier, it is difficult to perform a large-scale application without finding suitable anodic materials. In this work, the MoS2@C nanosheets are obtained by a three-roller grinder. With this technology, the bulk MoS2 can be thinned to form a nanosheet structure, and the phenolic resin attached to the MoS2 surface can form a carbon layer after carbonization to ultimately obtain MoS2@C. As the anode for potassium ion batteries (KIBs), the MoS2@C electrode shows a highly reversible discharge capacity of 382 mAh/g at 0.1 A/g after 50 cycles. This efficient preparation method opens a new path for 2D nanocomposites with the high-performance K+ storage applications.