L-Cysteine-Assisted Synthesis of Cubic Pyrite/Nitrogen-Doped Graphene Composite as Anode Material for Lithium-ion Batteries

Abstract Transition-metal sulfides have received increasing attention as electrode materials for high-performance Lithium-ion Batteries (LIBs). However, most of them are suffering from poor cycling stability and rate capability. Herein we report a new and facile strategy for synthesizing FeS 2 /nitrogen-doped graphene (FeS 2 /N-G) composite which shows improved electrochemical performance as an anode material for LIBs. The as-prepared FeS 2 /N-G (1:2, molar ratio) composite exhibits reversible discharge and charge capacities of 979 and 920 mAh g −1 , respectively, with good cycling performance and rate capability. SEM and TEM results show that the cubic FeS 2 are uniformly distributed on the surface of the nitrogen-doped graphene nanosheets (N-GNS) in the composite. The superior electrochemical performance of FeS 2 /N-G composite as LIBs anode is attributed to their robust composite structure and the synergistic effects between cubic FeS 2 and N-GNS. This synthesis approach could open up new opportunities in the design and fabrication of energy storage devices.