Nitrogen-doped multiwall carbon nanotubes for lithium storage with extremely high capacity

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• High-performance energy storage systems are in increasing demand.
• Lithium-ion capacitors (LICs) are an emerging class of devices combining features of lithium-ion batteries and supercapacitors.
• Existing carbon nanomaterials have limitations in lithium storage capability.

Purpose of the Study:

• To improve lithium storage capability in energy storage devices.
• To develop novel carbon nanomaterials for enhanced LIC performance.
• To investigate the effects of nitrogen-doping and nickel oxide nanoparticles on LIC performance.

Main Methods:

• Extrinsically defective multiwall carbon nanotubes were synthesized via nitrogen-doping.
• 3 nm nickel oxide nanoparticles were integrated with nitrogen-doped carbon nanotubes.
• Electrochemical performance, including capacity, cycle life, and rate capability, was evaluated.

Main Results:

• Nitrogen-doped carbon nanotubes exhibited wall defects facilitating lithium ion diffusion and storage.
• Integration with nickel oxide nanoparticles led to anomalous phenomena like nanoparticle division and agglomeration-free diffusion.
• The final cells achieved a high capacity of 3500 mAh/g, over 10,000 cycles, and a discharge rate capability of 1.5 minutes.

Conclusions:

• Nitrogen-doped carbon nanotubes with nickel oxide nanoparticles offer unprecedented cell performance for LICs.
• The developed material demonstrates significant improvements in energy storage capacity, cycle life, and rate capability.
• This work presents a promising pathway for advanced energy storage solutions.