Enhancing the cycling stability of Na-ion batteries by bonding MoS₂ on assembled carbon-based materials

Room temperature Na-ion batteries (SIBs) show great potential for use as renewable energy storage systems. However, the large-scale application of SIBs has been hindered by the lack of an ideal SIBs anode material. We synthesized MoS₂ on carbonized graphene-chitosan (G-C) using the hydrothermal method. The strong interaction between the MoS₂ and the G-C greatly improved the electron transport rate and maintained the structural stability of the electrode, which lead to both an excellent rate capability and long cycle stability. The G-C monolith was proven to enhance the electrical conductivity of the composites and served as a matrix for uniformly dispersing active MoS₂ nanosheets (NSs), as well as being a buffer material to adapt to changes in volume during the cycle. Serving as an anode material for SIBs, the MoS₂-G-C electrode showed good cycling stability (527.3 mAh g⁻¹ at 100 mA g⁻¹ after 200 cycles), excellent rate capability, and a long cycle life (439.1 mAh g⁻¹ at 1A g⁻¹ after 200 cycles).