▎ 摘　　要

FeS has received widespread attention due to advantages such as high capacity, low-budget, and friendly to the environment. But side reactions during the charging and discharging process result in volume expansion of FeS, which limits its application and further development. In this work, FeS@graphene composites were prepared by a single step pyrolytic sulfidation method using PEG as the carbon source, FeCl3 center dot 6H(2)O as the iron source, metal chloride and organic alcohol as a deep eutectic solvent. The prepared composites which were characterized by SEM and TEM exhibited a strong bond between FeS and graphene, graphene had a lamellar structure, and FeS nanoparticles formed a homogeneous dispersion. Among the prepared composite material electrodes, the FeS/G550 electrode displayed the best electrochemical properties with a high specific capacitance (initial discharge capacity: 1200 mAhg(-1); current density: 0.1 A g(-1)), excellent rate capability (discharge specific capacitance of 443 mAh.g(-1) at the current density of 5 A g(-1)), and good cyclic stability (capacity retention rate: 91%).