Preparation ofa Fe2O3/Reduced Graphene Oxide/Carbon Nanotube Composite with Highly Dispersed Fe2O3Particles:Electrochemical Performance as an Anode of Lithium Ion Batteries

Graphical Iron oxide/composite carbon (K3-Fe 2 O 3 -rGO/CNT) with well-dispersedFe 2 O 3 particles is prepared by in situ reaction. As anode,it exhibits improved electrochemical and battery performances. For K3-Fe 2 O 3 -rGO/CNT (30 %),it presents a high reversible capacity of 1559 mAh g −1 after 100 cycles at 100 mA g −1 . And its specific discharge capacitykeeps 543 mAh g −1 even at 2000 mA g −1 . In this paper, a series of iron oxide/reduced graphene oxide/carbon nanotube composites (K3-Fe 2 O 3 -rGO/CNT) with well-dispersedFe 2 O 3 particles are prepared by in situ reaction and then heat-treatment, and its electrochemical and battery performancesare studied as the anode material of lithium-ion batteries. The results show that the introduction of reduced graphene oxide/carbon nanotube (rGO/CNT) improves the electrochemical and battery performances of the prepared electrode material. In particular, the K3-Fe 2 O 3 -rGO/CNT (30 %) composite material has a reversible capacity of 1559 mAh g −1 after 100 charge/discharge cycles at 100 mA g −1 . And its specific discharge capacityis 641.1, 639.7, 609.5, 578.6 and 543 mAh g −1 at the current density of 100, 200, 500, 1000 and 2000 mA g −1 , respectively,with 84.7 % of capacity retention even with a 10 times increase in current density. The research of charge storage indicates that the electrochemical process is a mixed control process of diffusion and capacitance. The improved electrochemical and battery performancesfor the composite electrode material can be attributed to the enhanced dispersion of the Fe 2 O 3 and the enhanced conductive network provided by rGO/CNT composite carbon. It makes a promising way to prepare high performance of anode material for lithium-ion battery.