Abstract
? 2022 Elsevier B.V.Iron-based sulfides as anode materials for sodium ion batteries (SIBs) has been widely concerned because of low cost and high specific capacity. In this work, a facile and novel method is designed to prepare iron-based sulfides as anode materials for SIBs. A ternary FeS2-Fe7S8-FeCl2 composite is synthesized from FeCl3·6H2O via alcohol reduction and solid-phase sulfide. The structure and morphology of the obtained samples are characterized by XRD, XPS, SEM and TEM. Compared with binary FeS2-Fe7S8, FeS2-Fe7S8-FeCl2 exhibits enhanced electrochemical performance for SIBs. A specific capacity of 620 mAh g?1 at 200 mA g?1 after 90 cycles is obtained. In addition, FeS2-Fe7S8-FeCl2 delivers excellent rate performance (510 and 461 mAh g?1 at 1.0 and 2.0 A g?1). This new method for preparing iron-based sulfides has positive value for the synthesis of other sulfides.
NSTL
Elsevier