Synthesis and Electrochemical Performance of FeS2 Microspheres as an Anode for Li-ion Batteries

FeS2 nanosheets assembled FeS2 microspheres were synthesized using ferric chloride (II) and sodium thiosulfate as raw materials via one-pot hydrothermal method. We speculate the FeS2 growth mechanism by regulating the molar ratio of iron source to sulfur source and hydrothermal time. Meanwhile, we combine with XRD and SEM characterization results and filter optimal conditions to improve the electrochemical performance. At the current density of 500 mA/g, first discharge/charge capacity can reach 905 mA . h . g(-1) and 800 mA . h . g(-1), respectively, and the coulombic efficiency is 88. 4%. Even at high current density of 2000 mA/g, the FeS2 exhibit excellent cycling behavior with a stable capacity of 350 mA . h . g(-1) after 500 cycles.