Electrode Characteristics and Lithiation Mechanism of FePc/GN Composites

摘要

Iron-phthalocyanine (FePc), a metal-organic compound containing a large π-conjugated and planar multi-ring aromatic structure, can be employed as an organic anode material for lithium-ion batteries. To overcome the poor electronic conductivity of FePc, a good electrically conductive graphene nanosheet carbon skeleton is integrated by a one-step simple mechanical mixing strategy. In addition, the weight ratio of FePc and graphene nanosheets (GNs) is systematically optimized. Electrochemical tests show that the as-prepared 1/2.25-FePc/GN composite exhibits a high reversible capacity of 872 mAh g-1, the specific capacity based on iron-phthalocyanine is up to 1614 mAh g-1. The excellent electrochemical performance of FePc/GN is mainly attributed to the synergistic effect of FePc (large π- conjugated structure, rich in N atoms and aromatic rings) and graphene (flexibility and good electrical conductivity).