| Summary: | Potassium-ion batteries (PIBs) have aroused a large amount of interest recently due to the plentiful potassium resource, which may show cost benefits over lithium-ion batteries (LIBs). However, the huge volume expansion induced by the intercalation of large-sized potassium ions and the intrinsic sluggish kinetics of the anode hamper the application of PIBs. Herein, by rational design, nano-roses assembled from petals with a MoS<sub>2</sub>/monolayer carbon (C-MoS<sub>2</sub>) sandwiched structure were successfully synthesized. The interlayer distance of ultrathin C-MoS<sub>2</sub> was expanded from original MoS<sub>2</sub> of 6.2 to 9.6 Å due to the formation of the MoS<sub>2</sub>-carbon inter overlapped superstructure. This unique structure efficiently alleviates the mechanical strain, prevents the aggregation of MoS<sub>2</sub>, creates more active sites, facilitates electron transport, and enhances the specific capacity and K<sup>+</sup> diffusion kinetics. As a result, the prepared C-MoS<sub>2</sub>-1 anode delivers a high reversible specific capacity (437 mAh g<sup>−1</sup> at 0.1 A g<sup>−1</sup>) and satisfying rate performance (123 mAh g<sup>−1</sup> at 6.4 A g<sup>−1</sup>). Therefore, this work provides new insights into the design of high-performance anode materials of PIBs.
|
|---|