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High energy ball-milled iron sulfides with thin carbon layer coating (BM-FeS/C composites) were prepared by the simple and economical process. Ball-milled process, followed by carbon coating, reduced the particle size and increased the electrical conductivity. When employed as sodium-ion battery anodes, BM-FeS/C composites showed extremely high electrochemical performance with reversible specific capacity of 589.8 mAh·g-1 after 100 cycles at a current density of 100 mA·g-1. They also exhibited superior rate capabilities of 375.9 mAh·g-1 even at 3.2 A·g-1 and 423.6 mAh·g-1 at 1.5 A·g-1. X-ray absorption near edge structure analysis confirmed the electrochemical pathway for conversion reaction of BM-FeS/C composites.
This work is based upon research conducted at the Institute for Basic Science (IBS) in Republic of Korea and Y. E. S. acknowledges the financial support by IBS-R006-A2.