Defect-rich MoS2(1−x)Se2x few-layer nanocomposites: a superior anode material for high-performance lithium-ion batteries

Abstract

Herein, defect-rich MoS_2(1−x)Se_2x few-layer nanocomposites were prepared by the co-etching method using molybdenum trioxide nanowires as a template. The novel defect-rich structure introduces additional active edge sites into the MoS_2(1−x)Se_2x few-layer nanocomposites; these additional active edge sites significantly improve the electrochemical energy storage performance of the few-layer nanocomposites; thus, MoS_2(1−x)Se_2x (x = 0.25) shows excellent electrochemical performance e.g. the specific capacity of up to 500 mA h g⁻¹ at the large current density of 5C after 350 cycles, and the coulombic efficiency is close to 100%. These excellent performances have proved that these few-layer ternary metal sulfide–selenide nanomaterials with rich defects can be widely used in Li-ion batteries.