Porous FeS2 nanoparticles wrapped by reduced graphene oxide as high-performance Lithium-ion battery cathodes

Porous FeS2 nanoparticles wrapped by reduced graphene oxide were synthesized by a facile one-step solvothermal approach and applied as cathode materials of Lithium-ion batteries. Porous structure and graphene help FeS2 exhibits a superior cycling stability and rate performance, with a discharge capacity of 435 mA h g−1 at a current density of 1000 mA g−1 after 200 cycles. Moreover, the FeS2 composite shows impressive performance at high current density. It retains a discharge capacity of over 170 mA h g−1 even at a current density of 10 A g−1 after 2000 cycles, demonstrating its potential applications as cathode materials for Lithium-ion batteries with high energy density.