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Persistent Electrochemical Performance in Epitaxial VO2(B).

Shinbuhm Lee1, Xiao-Guang Sun2, Andrew A Lubimtsev3,4

  • 1Materials Science and Technology Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States.

Nano Letters
|March 8, 2017
PubMed
Summary
This summary is machine-generated.

Bronze-phase vanadium dioxide (VO2(B)) films achieve theoretical capacity and stable cycling for lithium-ion batteries. This breakthrough in energy storage materials offers high power and capacity without chemical modification.

Keywords:
Li ion batteryVO2(B)electrodeenergy storageepitaxy

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • High-performance energy storage is crucial for renewable energy, electric vehicles, and mobile devices.
  • Bronze-phase vanadium dioxide (VO2(B)) shows promise as a lithium-ion battery electrode due to its structure and conductivity.
  • Previous studies faced challenges in achieving desired cycling performance and capacity in VO2(B) without modifications.

Purpose of the Study:

  • To demonstrate the potential of epitaxial VO2(B) films for high-performance lithium-ion batteries.
  • To investigate the structural stability and ion conduction pathways in VO2(B).
  • To achieve theoretical capacity limits with excellent cyclability.

Main Methods:

  • Epitaxial growth of VO2(B) films.
  • Atomic-scale characterization using scanning transmission electron microscopy (STEM).
  • Density functional theory (DFT) calculations for Li adsorption and diffusion analysis.

Main Results:

  • Epitaxial VO2(B) films achieved theoretical capacity with persistent charging-discharging cyclability.
  • High structural stability and unique open pathways facilitate Li ion conduction.
  • DFT calculations confirmed stable Li adsorption and diffusion sites within the VO2(B) structure.

Conclusions:

  • VO2(B) is a highly promising material for advanced energy storage applications.
  • The material exhibits superior cyclability, high power, and capacity in lithium-ion conductors.
  • No intrinsic limitations were found for VO2(B) in achieving excellent electrochemical performance.