Iron sulfides are promising anode materials for lithium ion batteries (LIBs) owe to their high theoretical capacity and low cost.However,unsatisfactory electronic conductivity,dissolution of polysulfides,and severe agglom-eration during the cycling process limit their applications.To solve these issues,a ternary FeS2/Fe7S8@nitrogen-sulfur co-doping reduced graphene oxide hybrid (FeS2/Fe7S8@NSG) was designed and synthesized through a facile hydrolysis-sulfurization strategy,in which the FeS2/Fe7S8 could be well distributed upon the NSG.The NSG was believed to buffer the volume change and augment the electronic conductivity of the electrode,and the nano-dimensional FeS2/Fe7S8 particles with a diameter of 50-100 nm could shorten the ion-diffusion paths during the lithiation/delithiation process.Benefiting from synergistic contributions from nano-dimensional FeS2/Fe7S8 and flexible NSG,the FeS2/Fe7S8@NSG hybrid displayed a high initial capacity of ～1068 mAh g-1 at 200 mA g-1,good cycling stability (～898 mAh g-1 at 500 mA g-1 after 200 cycles) and high-rate performance.Further kinetic analysis corroborated that the introduction of NSG boosted the capacitive behavior.Above results indicate the potential applications of FeS2/Fe7S8@NSG hybrid in LIBs with low-cost and high energy density.