MoS0.5Se1.5 Embedded in 2D Porous Carbon Sheets Boost Lithium Storage Performance as an Anode Material

A promising anode material is developed for Li‐ion batteries consisting of MoS 0.5 Se 1.5 particles uniformly embedded in 2D porous carbon sheets (denoted as MoS 0.5 Se 1.5 /C sheets). The formation of MoS 0.5 Se 1.5 /C sheets depends on a facile and cost‐effective potassium chloride (KCl)‐assisted strategy. The micrometer‐level KCl crystals are selected as the solid template because they are more easily precipitated than metal precursors and carbon source during recrystallization, which drives the simultaneous formation of carbon sheets and MoS 0.5 Se 1.5 particles on KCl surface after pyrolysis; while makes a tighter integration between MoS 0.5 Se 1.5 and carbon sheets. As an anode for Li‐ion batteries, the MoS 0.5 Se 1.5 /C sheets show more excellent Li storage properties compared to that of S‐free MoSe 2 /C sheets, including excellent cyclic stability and high rate capacity. Specifically, 494.8 mA h g −1 at a current density of 100 mA g −1 still is maintained for MoS 0.5 Se 1.5 /C sheets after 200 cycles, which is much higher than that of MoSe 2 /C sheets (173.5 mA h g −1 ). The significantly enhanced performance of MoS 0.5 Se 1.5 /C sheets can be attributed to the synergistic combination of MoS 0.5 Se 1.5 phase and porous carbon sheets, which provides an effective conductive matrix and buffer spaces for Li‐ion/electronic transfer and MoS 0.5 Se 1.5 expansion, during the charge–discharge.