A variety of carbon-coated FeS2 anodes: FeS2@CNT with excellent lithium-ion storage performance

Pyrite FeS2, which has abundant reserves, is widely regarded as an excellent anode material for lithium-ion batteries. However, FeS2 is prone to volume expansion and low conductivity during charging and discharging, resulting in poor electrochemical performance. In this paper, a fast non-hydrogel method was used to synthesize the precursor of FeS2 @C (carbon nanotubes, graphene, crab shell carbon, and sucrose carbon), and the obtained FeS2@CNT has a relatively best electrochemical performance. Benefiting from its structural advantages, FeS2@CNT exhibits a good rate performance (1200, 1125, 1020, 920 and 820 mA h g−1 at five levels of the current density of 100–2000 mA g−1). And it has an excellent cycle performance (1200 mA h g−1 after 100 cycles at 100 mA g−1). It shows that this method has considerable advantages in the process of preparing composites.