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Chinese Journal of Materials Research  2017, Vol. 31 Issue (5): 374-380    DOI: 10.11901/1005.3093.2016.498
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Preparation and Lithium Storage Performance of Two Dimensional Fold-like V2O5 Nanomaterial
Yanwei LI1,2, Zhiping XIE1, Canzheng LIU1, Jinhuan YAO1(), Jiqiong JIANG1, Jianwen YANG1
1 Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China
2 Key Laboratory of Rrenewable Energy, Chinese Academy of Sciences, Guangzhou 510640, China
Cite this article: 

Yanwei LI, Zhiping XIE, Canzheng LIU, Jinhuan YAO, Jiqiong JIANG, Jianwen YANG. Preparation and Lithium Storage Performance of Two Dimensional Fold-like V2O5 Nanomaterial. Chinese Journal of Materials Research, 2017, 31(5): 374-380.

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Abstract  

V2O5 gel was prepared by sol-gel method and V2O5 nanomaterial was fabricated by freeze-drying the V2O5 gel with proper pH value and followed by annealing treatment. XRD and FESEM results revealed that the prepared V2O5 nanomaterial consists of a single orthorhombic phase small V2O5 nanoparticles with alarge are a two-dimensional fold-like morphology. The lithium storage performance of the prepared V2O5 nanomaterial was characterized by cyclic voltammetry(CV), electrochemical impedance spectroscopy(EIS), potential relaxation technique(PRT), and charge-discharge tests. Due to the unique two-dimensional fold-like nanostructure, the prepared V2O5 nanomaterial exhibits much higher specific discharge capacity, better high rate performance, excellent cycling stability, and enhanced electrochemical reaction kinetics rather than the commercial V2O5. Therefore, the two-dimensional fold-like V2O5 nanomaterial is a very promising cathode material for lithium-ion batteries.

Key words:  synthesizing and processing technics      V2O5      sol-gel method      cathode material      lithium storage performance     
Received:  23 August 2016     
Fund: Supported by National Natural Science Foundation of China (Nos.51664012, 51464009 & 21263003), Guangxi Natural Science Foundation of China (Nos.2015GXNSFGA139006 & 2014GXNSFBA118238), and Key Laboratory of Renewable Energy, Chinese Academy of Sciences (No.y507k61001)

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.498     OR     https://www.cjmr.org/EN/Y2017/V31/I5/374

Fig.1  XRD patterns of N-V2O5 sample (the vertical lines on the x-axis correspond to the standard XRD reflections of orthorhombic V2O5 and the inset shows the crystalline structure of layer V2O5)
Fig.2  FESEM images of N-V2O5 sample (a, b, c) and C-V2O5 sample (d)
Fig.3  CV curves (a) and EIS plots (b) of N-V2O5 and C-V2O5
Fig.4  Cycling performance (a) and rate performance (c) of N-V2O5 and C-V2O5 electrodes;charge/discharge curves at various cycles (b) and under various current densities (d) of N-V2O5 electrode
Fig.5  Charge/discharge curve (a), typical OCP-t curve (b) and typical curve of ln[exp(φ-φ)F/RT-1] vs. t (c) of N-V2O5 electrode; (d) Chemical diffusion coefficient of Li ions in the N-V2O5 and C-V2O5 electrode
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