Quantum-Dot-Based Carbon Nanotubes: Design, Doping, and Lithium Storage for High-Capacity Energy Applications

Area of Science:

• Materials Science
• Nanotechnology
• Computational Chemistry

Background:

• Graphene quantum dots offer unique quantum confinement and edge effects.
• Developing advanced materials for energy storage is crucial for next-generation batteries.

Purpose of the Study:

• To design and investigate novel nanotubes with quantum confinement and edge effects.
• To explore their structural, electronic, and energy storage properties for lithium-ion batteries.

Main Methods:

• Density functional theory (DFT) and molecular dynamics (MD) simulations.
• Frequency and MD simulations for structural and thermal stability analysis.
• Energy calculations to determine lithium adsorption capacity.

Main Results:

• Finite graphene nanotubes exhibit structural and thermal stability up to 400 K.
• Boron and nitrogen doping significantly enhance electrical conductivity by reducing the energy gap (2.49 eV to 0.4 eV).
• Nanotubes achieve a theoretical storage capacity of 2295.3 mAh g^-1 with minimal structural deformation, especially nitrogen-modified ones.

Conclusions:

• These quantum nanotubes demonstrate high theoretical lithium storage capacity and excellent stability.
• They present a promising avenue for developing high-capacity lithium-ion batteries without dendrite formation.
• The findings support their potential for next-generation energy storage technologies.