Enhanced lithium storage of mesoporous vanadium dioxide（B） nanorods by reduced graphene oxide support

摘要

A facile synthesis of vanadium oxide with reduced graphene oxide(rGO) is developed and used as cathode material for lithium ion batteries. VO_2(B) nanorods and VO_2(B)-rGO composite were prepared by a hydrothermal method using NaVO_3 precursor and sodium oxalate as a reducing agent. The monoclinic phase and nanorod like morphology of synthesized materials were confirmed by XRD, SEM, and TEM respectively. The electrochemical properties of samples were investigated at 1.5–4.0 V, and 0.1 C rate,and the VO_2(B) nanorods exhibit reversible capacity of about 159 mAh g^(-1), whereas VO_2(B)-rGO exhibits 274 mAh g^(-1). The reasonable discharge capacities were obtained at high rates. The enhanced performance in electrical energy storage system reveals the effectiveness of rGO in the composite, as it enhances the conductive electron pathway to overcome the intrinsic limits of single phase VO_2(B).