Constructing MoS2/CoMo2S4/Co3S4 nanostructures supported by graphene layers as the anode for lithium-ion batteries

Abstract

With the increasing energy demand, it is very urgent to develop new anode materials for lithium ion batteries (LIBs). Designing nanostructures and constructing multicomponent metal sulfides are vital for enhancing the electrochemical performance. This study reports a new synthetic method to construct MoS₂/CoMo₂S₄/Co₃S₄ nanostructures supported by graphene. A key step in the process, high temperature annealing, promotes the interdiffusion of metal sulfides to form multicomponent metal sulfides and establishes a strong C–S bond between the MoS₂/CoMo₂S₄/Co₃S₄ nanostructure and graphene. The unique nanostructure and synergistic effects between the conductive graphene and the MoS₂/CoMo₂S₄/Co₃S₄ nanostructure endows the material with good lithium storage. As a result, it exhibits a good rate performance (360 mA h g⁻¹ at 10 A g⁻¹) and a high specific capacity (770 mA h g⁻¹ at 0.2 A g⁻¹). This study provides a unique method to construct promising anode materials for the application of LIBs.