Molybdenum Disulfide/Reduced Graphene Oxide Nanocomposite with Expanded Interlayer Spacing for Sodium Ion Batteries

Abstract

MoS2 with a layered structure has attracted extensive interest as anode for sodium ion batteries due to its weak interlayer vander Waals forces. MoS2/reduced graphene oxide (MSRGO) with expanded interlayer spacing and rich defects has been synthesized through a simple hydrothermal process. The expanded interlayer spacing and rich defects of MoS2 can effectively reduce the diffusion resistance of Na ions and provide the accessible active sites for Na ions storage. The reduced graphene oxide (RGO) matrix can greatly improve the electronic conductivity and enhance the structural stability of electrode. The integrated electrode of MoS2 and RGO as anode for sodium ion batteries exhibits high specific capacity, excellent cycling stability and rate capability. The MSRGO140 electrode as anode for sodium ion batteries displays high reversible capacities of 428 mAh g−1 at a rate of 0.1 A g−1 after 300 cycles and 204 mAh g−1 at 1.0 A g−1 after 200 cycles together with excellent rate capability. This strategy provides an effective method for the preparation of expanded MoS2 with high-performance anode for sodium ion batteries.