▎ 摘　　要

FeS2/reduced graphene oxide (RGO) composites were prepared through a facile hydrothermal method using FeCl2, Na(2)S(2)O3 and graphene oxide(GO) as the starting materials. X-ray diffractometer (XRD), scanning electron microscope (SEM), laser particle size distribution analyzer, and differential thermal analyzer (DTA) were used to characterize the prepared nanocomposites. The results show that graphene oxide prevents the aggregation of FeS2 particles during the hydrothermal synthesis, and make FeS2 form loose spherical particles. FeS2/RGO exhibits a high specific capacity of 314.9 mAh/g with a cut-off voltage of 1.5 V at constant current density of 100 mA/cm(2) and temperature of 450 degrees C in LiCl-KCl melt, which is 65.6 mAh/g higher than that of FeS2. FeS2/RGO exhibits a high specific capacity of 302.3 mAh/g with a cut-off voltage of 1.5 V at constant current density of 100 mA/cm(2) and temperature of 500 degrees C in LiF-LiCl-LiBr melt, which is 29.8 mAh/g higher than that of FeS2. In contrast with FeS2, the conductivity of the FeS2/RGO cathode material is improved, the resistance of the single cell is relatively lower during discharge process, thus FeS2/RGO cathode has a better battery discharge capacity.