Few layers 2D MoS2/tubular sisal fiber-derived carbon composite: Enhanced cycling performance as anode material for sodium-ion batteries

Biomass carbon for sodium ion anode material has advantages of wide source, low cost, and renewable resources, but poor electrochemical performance limits its commercial application. In this work, we propose a hybrid composite based on few-layer MoS2 2D nano-structures and tubular sisal fiber carbon (TSFC) micro-structures as anode materials for SIBs, where the in situ vertical growth of MoS2 nanosheets uniformly on TSFC was suc-cessfully obtained by a simple hydrothermal method. It is found that the synthesis conditions play an important role in the formation of MoS2 nanosheets and provide tunable structure, morphology, and electrochemical property for the proposed composites. The unique cross-linked network micro-nano-structures of the MoS2/TSFC can effectively improve the electrochemical performance of the anode materials, which shows a reversible specific capacity up to 243 mAh g-1 after 500 long-term cycles at a current density of 0.1 A g-1, with a capacity retention of 97 % from 200 to 500 cycles, and a high initial coulombic efficiency of 64 %. This work can provide new way of resource utilization for natural sisal cellulose, and obtain a new low-cost high-performance sodium ion battery anode material.

Automated summary

In this study, a hybrid composite based on few-layer MoS2 2D nano-structures and tubular sisal fiber carbon (TSFC) micro-structures was synthesized as anode material for sodium ion batteries (SIBs). The MoS2 nanosheets were uniformly grown on TSFC through a simple hydrothermal method. The unique cross-linked network micro-nano-structures of the MoS2/TSFC composite greatly improved the electrochemical performance of the anode materials, showing excellent cycling stability, capacity retention, and high initial coulombic efficiency.