Application of WS2-G composite as cathode for rechargeable magnesium batteries

The graphene-supported WS(2)composite (WS2-G) was synthesized by the ultra-sonication method. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and field emission scanning electron microscopy (FESEM) showed WS(2)had been successfully combined with the graphene. The charge-discharge tests, cyclic voltammetry, and electrochemical impedance spectroscopy were used to study electrochemical properties of as-synthesized composite material. The results showed that the electrochemical properties of graphene-supported WS(2)were superior to that of WS(2)material. The initial discharge capacity of the graphene-supported WS(2)material reached 82 mAh g(-1). After 100 cycles, it still had a capacity retention rate of 95%. Enhanced electrochemical performance of graphene-supported WS(2)could be attributed due to the synergistic effect between WS(2)and highly conductive graphene. The intercalation behavior of Mg(2+)is further confirmed by XRD, EDX, and XPS analysis.