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Two-dimensional V2O5 sheet network as electrode for lithium-ion batteries.

Yun Xu1, Marco Dunwell, Ling Fei

  • 1Department of Chemical and Materials Engineering, New Mexico State University , New Mexico 88003, United States.

ACS Applied Materials & Interfaces
|November 5, 2014
PubMed
Summary

Synthesized two-dimensional vanadium pentoxide (V2O5) nanosheets with carbon layers exhibit high capacity for lithium-ion batteries. Manganese doping further enhances cathode performance by improving conductivity.

Keywords:
V2O5 networkconductivitylithium-ion batterymanganese-dopedpolymer-assisted solution method

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Vanadium pentoxide (V2O5) is a promising cathode material for lithium-ion batteries.
  • Developing advanced nanostructures is crucial for improving battery performance.
  • Carbon-coating enhances the electrochemical properties of electrode materials.

Purpose of the Study:

  • To synthesize two-dimensional (2D) V2O5 nanosheets with carbon layers.
  • To investigate the effect of manganese doping on V2O5 performance.
  • To explore the potential of these materials as high-capacity electrodes for lithium-ion batteries.

Main Methods:

  • One-step polymer-assisted chemical solution synthesis.
  • Characterization using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and thermal-gravimetric analysis (TGA).
  • Electrochemical evaluation using galvanostatic discharge-charge analysis.

Main Results:

  • A network-like sheet structure of V2O5 covered with thin carbon layers was successfully synthesized.
  • The V2O5 network demonstrated high capacities of ~300 mA·h/g (cathode) and ~600 mA·h/g (anode) at 100 mA/g.
  • Manganese doping (5% molar ratio) increased the cathode capacity from 99 to 165 mA·h/g at 1 A/g.
  • The unique network structure facilitates lithium-ion transport.

Conclusions:

  • The synthesized 2D V2O5 nanosheet network with carbon coating offers excellent electrochemical performance.
  • Manganese doping significantly enhances the electronic conductivity and cathode capacity.
  • This material presents a promising pathway for advanced lithium-ion battery electrodes.