Effective combination of FeS2 microspheres and Fe3S4 microcubes with rGO as anode material for high-capacity and long-cycle lithium-ion batteries

Iron sulfides receive special interests as anode materials for lithium or sodium ion batteries in view of their low-cost, environmental benign, and high conductivities. Here, a combination of FeS2 microspheres and Fe3S4 microcubes with reduced graphene oxides (iron sulfides@rGO) is prepared by a facile in-situ hydrothermal method. As an anode material for lithium ion batteries, iron sulfides@rGO exhibits excellent lithium storage ability. It delivers a high initial discharge capacity of 1476.2 mA h/g at 100 mA/g, and 1189.6 mA h/g capacity can be maintained after 100 cycles. Most impressively, 800 mA h/g capacity can be remained after 1000 cycles even at 1 A/g.