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Synthesis of H 2 V 3 O 8 /Reduced Graphene Oxide Composite as a Promising Cathode Material for Lithium‐Ion Batteries
Author(s) -
Zhu Kai,
Yan Xiao,
Zhang Yongquan,
Wang Yuhui,
Su Anyu,
Bie Xiaofei,
Zhang Dong,
Du Fei,
Wang Chunzhong,
Chen Gang,
Wei Yingjin
Publication year - 2014
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201300331
Subject(s) - graphene , materials science , dielectric spectroscopy , raman spectroscopy , cyclic voltammetry , x ray photoelectron spectroscopy , scanning electron microscope , oxide , transmission electron microscopy , nanowire , electrochemistry , lithium (medication) , analytical chemistry (journal) , cathode , composite number , chemical engineering , nanotechnology , composite material , electrode , chemistry , optics , medicine , physics , engineering , endocrinology , metallurgy , chromatography
H 2 V 3 O 8 nanowires wrapped by reduced graphene oxide (RGO) are synthesized successfully through a simple hydrothermal process. The structural properties of the samples are characterized by X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, Raman scattering, and X‐ray photoelectron spectroscopy. The RGO nanosheets modify the surfaces of the H 2 V 3 O 8 nanowires through VC linkages. The H 2 V 3 O 8 /RGO composite exhibits a remarkably enhanced electrochemical performance in terms of its reversible capacity, cyclic performance, and rate capability. The material shows high discharge capacities of 256 and 117 mA h g −1 at the current densities of 0.1 and 1 A g −1 , respectively, with almost no capacity fading after fifty charge/discharge cycles. Cyclic voltammetry and electrochemical impedance spectroscopy show that the superior electrochemical performance of H 2 V 3 O 8 /RGO can be attributed to the cooperation of RGO, which provides better mechanical flexibility, higher electronic conductivity, and smaller charge‐transfer resistance.