▎ 摘　　要

In this study, CoNi2S4 were successfully grown on reduced graphene oxide (rGO) by a simple one-pot solvothermal process, and applied to anode materials for sodium-ion batteries (SIBs) for the first time. The structural features and components of the obtained CoNi2S4/rGO were characterized by a series of testing methods. The electrochemical performances testing results suggested that the sodium storage performances of the CoNi2S4/rGO nanocomposites were enhanced dramatically compared with pure CoNi2S4. The CoNi2S4/rGO anode expresses an excellent reversible capacity of 430 mAh g(-1) after 50 cycles at 100 mA g(-1). The CoNi2S4/rGO electrode still shows a reversible capacity of 521 mAh g(-1) when the current density grows to 1000 mA g(-1). The enhancement of electrochemical performances is due to the addition of rGO, which can effectively buffer volume variations and improve electrical conductivity during charge-discharge process. The CoNi2S4/rGO nanocomposites can be a promising anode material for SIBs.