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High density mechanical energy storage with carbon nanothread bundle.

Haifei Zhan1,2, Gang Zhang3, John M Bell4

  • 1School of Mechanical, Medical and Process Engineering, Queensland University of Technology (QUT), Brisbane, QLD, 4001, Australia.

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Ultra-thin carbon nanothread bundles show high mechanical energy storage density, comparable to carbon nanotubes. Their unique structure allows for efficient energy storage through pure tension, making them promising for energy devices.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Energy Storage

Background:

  • Carbon nanofibers possess excellent mechanical properties, suggesting potential for energy applications.
  • Carbon nanothreads are ultra-thin structures derived from carbon nanofibers.

Purpose of the Study:

  • To investigate the mechanical energy storage density of carbon nanothread bundles.
  • To compare the energy storage capacity of nanothread bundles with carbon nanotube bundles.

Main Methods:

  • In silico studies
  • Continuum elasticity theory

Main Results:

  • Carbon nanothread bundles exhibit high mechanical energy storage density.
  • Gravimetric energy density decreases with the number of filaments, dominated by torsion and tension.
  • Bundles fracture due to coupled stresses before individual deformation limits are reached.
  • Nanothread bundles show comparable energy storage to (10,10) carbon nanotube bundles.
  • Pure tension in nanothread bundles achieves a gravimetric energy density of up to 1.76 MJ kg⁻¹.

Conclusions:

  • Carbon nanothread bundles are a viable alternative for energy storage devices.
  • The unique structure of nanothreads enables efficient energy storage through pure tension.