MoS2 Being Used as Negative Electrode for Asymmetric Electrochemical Capacitors

MoS2 was adopted as a negative electrode material for the asymmetric electrochemical capacitors of MoS2/activated carbon (AC) using Li+-based organic electrolytes. This type of capacitors possesses the working voltage as high as 3.4 V. The physical properties of the negative electrode were characterized by XRD and SEM, etc. The charge storage mechanism at the negative electrode was studied and the effect of weight ratio of AC/MoS2 was investigated. The electrochemical performance tests reveal that the capacitors have relatively high energy density and power density, i.e., 28.7 Wh/kg and 1203.4 W/kg, respectively. The capacitors also show good cycle stability, displaying a 76.6% capacity retention after 1000 cycles at current density of 0.4 A/g.