Graphene‐Assisted Exfoliation of Molybdenum Disulfide to Fabricate 2D Heterostructure for Enhancing Lithium Storage

摘要

> Graphene–molybdenum sulfide composite materials are attracting considerable interest as a promising candidate of anode for lithium‐ion batteries because of their excellent electrical properties. However, few studies have been conducted on the lithium‐storage mechanism and process of dynamics of these materials. In this work, the lithium‐storage mechanism of these materials is examined by structural characterization and kinetic analysis. Structural characterization results show that the prepared G/MoS ₂ is a heterostructure and contains C?S bonds after treatment with a novel layered graphene oxide‐assisted ultrasonic method. The existence of C?S bond benefits the transport of lithium ion and electrons and enhances the electrochemical properties of G/MoS ₂ electrode. Kinetic analysis further reveals that the lithium‐ion diffusion effect plays a major role in charge and discharge processes. This synthesis method and analysis strategy may also apply to other composite materials for high‐performance lithium‐ion storage.