Three-dimensional carbon frameworks enabling MoS2 as anode for dual ion batteries with superior sodium storage properties

A (MoS 2 /carbon fiber (CF))@MoS 2 @C hybrid has been prepared by an efficient method combining the electrospinning, hydrothermal and annealing techniques. Coupled with graphite as cathode, the hybrid enables the full cell ( i.e. , dual ion batteries) to deliver a high initial discharge capacity of 112.3 mAh g −1 at 0.2 A g −1 and maintain a high reversible capacity of 90.5 mAh g −1 at 0.5 A g −1 after 500 cycles. These remarkable sodium storage properties of (MoS 2 /CF)@MoS 2 @C are mainly attributed to its three-dimensional framework with its highly conductive, cross-linked structure, which effectively increases the conductivity of the hybrid and the mass loading of MoS 2 . Moreover, the MoS 2 nanoplates embedded inside CF, as well as being sandwiched between the CF/MoS 2 and a thin carbon layer , also can effectively buffer the pulverization and aggregation of the electrode, and thus maintain the structural integrity of (MoS 2 /CF)@MoS 2 @C during the charge-discharge process.