MoS 2 embedded in 3D interconnected carbon nanofiber film as a free-standing anode for sodium-ion batteries

As a typical two-dimensional transition metal dichalcogenide, molybdenum disulfide (MoS 2 ) is considered a potential anode material for sodium-ion batteries (NIBs), due to its relatively high theoretical capacity (∼ 670 mAh·g –1 ). However, the low electrical conductivity of MoS 2 and its dramatic volume change during charge/discharge lead to severe capacity degradation and poor cycling stability. In this work, we developed a facile, scalable, and effective synthesis method to embed nanosized MoS 2 into a thin film of three-dimensional (3D)-interconnected carbon nanofibers (CNFs), producing a MoS 2 /CNFs film. The free-standing MoS 2 /CNFs thin film can be used as anode for NIBs without additional binders or carbon black. The MoS 2 /CNFs electrode exhibits a high reversible capacity of 260 mAh·g –1 , with an extremely low capacity loss of 0.05 mAh·g –1 per cycle after 2,600 cycles at a current density of 1 A·g –1 . This enhanced sodium storage performance is attributed to the synergistic effect and structural advantages achieved by embedding MoS 2 in the 3D-interconnected carbon matrix.