Abstract
Transition metal sulfides exhibit great potential in the application of sodium ion battery anode materials because of their unique properties and high theoretical capacity. Nevertheless, their inferior rate and cycling performances impede the commercialization process. Pseudocapacitance is a significant sodium ion storage behavior to enhance reaction kinetics, which is beneficial to the improvement of electrochemical performances. Herein, an anode material possessing heterojunction structure has been constructed through decorating SnS_2 nanoparticles on the surface of MoS_2@rGO (SnS_2@MoS_2@rGO), displaying a high reversible capacity of 237 mAh g~(-1) at 3.2 A g~(-1) and 167 mAh g~(-1) at 6.4 A g~(-1) after 140 cycles. The good electrochemical performances of SnS_2@MoS_2@rGO electrode can be ascribed to the enlarged surface areas and fast sodium ion transport channel resulting from the heterojunction structure. In addition, the sodium ion full cell consists of SnS_2@MoS_2@rGO anode and Na_3V_2(PO_4)_3@C cathode can even exhibit ideal specific capacity (33 mAh g~(-1) at 20 C (1 C = 117 mA g~(-1))), showing potential application prospects.
NSTL
Elsevier