Solvent Induced Activation Reaction of MoS Nanosheets within Nitrogen/Sulfur-Codoped Carbon Network Boosting Sodium Ion Storage.

MoS , as a classical 2D material, becomes a capable anode candidate for sodium-ion batteries. However, MoS presents a disparate electrochemical performance in the ether-based and ester-based electrolyte with unclear mechanism. Herein, tiny MoS nanosheets embedded in nitrogen/sulfur-codoped carbon (MoS @NSC) networks are designed and fabricated through an uncomplicated solvothermal method. Thanks to the ether-based electrolyte, the MoS @NSC shows a unique capacity growth in the original stage of cycling. But in the ester-based electrolyte, MoS @NSC shows a usual capacity decay. The increasing capacity puts down to the gradual transformation from MoS to MoS with the structure reconstruction. Based on the above mechanism, MoS @NSC demonstrates an excellent recyclability and the specific capacity keeps around 286 mAh g at 5 A g after 5000 cycles with an ultralow capacity fading rate of only 0.0034% per cycle. In addition, a MoS @NSC‖Na V (PO ) full cell with ether-based electrolyte is assembled and demonstrates a capacity of 71 mAh g , suggesting the potential application of MoS @NSC. Here the electrochemical conversion mechanism of MoS is revealed in the ether-based electrolyte and significance of the electrolyte design on the promoting Na ion storage behavior is highlighted.