Preparation of a Sulfur-Doped Graphene-Wrapped FeS2 Microsphere Composite Material for Lithium-Ion Batteries

Pyrite (FeS2) is considered a promising anode material for lithium-ion batteries (LIBs) relying on its high theoretical specific capacity and low cost. However, the application of FeS2 as anodes has been greatly limited due to its low electrical conductivity and huge volume expansion during cycling. In this work, a facile approach was developed to prepare an FeS2 and sulfur-doped graphene (SG) composite (FeS2/SG). The product exhibits good electrochemical performance in terms of a high capacity of 1033.4 mAh·g–1 at 0.1 A·g–1 after 60 cycles and good rate performance because of its conductive network and porous structure. Therefore, the FeS2/SG composite can be considered a candidate material for LIB anodes considering such desirable electrochemical performances and the economic synthesis route.