title: Synergetic effects of Al3+ doping and graphene modification on the electrochemical performance of V2O5 cathode materials.
abstract: A series of V2O5-based cathode materials that include V2O5 and Al0.14 V2O5 nanoparticles, V2O5/reduced graphene oxide (RGO), and Al0.16 V2O5/RGO nanocomposites are prepared by a simple soft chemical method. XRD and Raman scattering show that the Al ions reside in the interlayer space of the materials. These doping ions strengthen the V−O bonds of the [VO5] unit and enhance the linkage of the [VO5] layers, which thus increases the structural stability of V2O5. SEM and TEM images show that the V2O5 nanoparticles construct a hybrid structure with RGO that enables fast electron transport in the electrode matrix. The electrochemical properties of the materials are studied by charge-discharge cycling, cyclic voltammetry, and electrochemical impedance spectroscopy. Of all the materials tested, the one that contained both Al ions and RGO (Al0.16 V2O5/RGO) exhibited the highest discharge capacity, the best rate capability, and excellent capacity retention. The superior electrochemical performance is attributed to the synergetic effects of Al(3+) doping and RGO modification, which not only increase the structural stability of the V2O5 lattice but also improve the electrochemical kinetics of the material.
authors.affiliation: Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University, Changchun 130012 (PR China), (Y. J. Wei).
authors.forename: Kai
authors.initials: K
authors.lastname: Zhu
authors.forename: Hailong
authors.initials: H
authors.lastname: Qiu
authors.forename: Yongquan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Dong
authors.initials: D
authors.lastname: Zhang
authors.forename: Gang
authors.initials: G
authors.lastname: Chen
authors.forename: Yingjin
authors.initials: Y
authors.lastname: Wei
mesh_terms: D000535:Aluminum / Q000737:chemistry*; D004563:Electrochemistry; D004566:Electrodes; D006108:Graphite / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry; D010087:Oxides / Q000737:chemistry; D017968:Vanadium Compounds / Q000737:chemistry*
chemical_list: D010087:Oxides; D017968:Vanadium Compounds; D006108:Graphite; C066075:vanadium pentoxide; D000535:Aluminum
keywords: doping; graphene; lithium; materials science; vanadium