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TiO2 seeded on nitrogen-doped porous carbon nanofibers for superior electrochemical performance as freestanding

Wei Wang1, Yaohui Liang1, Fengyan Li1

  • 1State Key Laboratory of Separation Membranes and Membrane Processes, School of Textiles, Tianjin Polytechnic University, Tianjin 300387, People's Republic of China.

Nanotechnology
|September 14, 2018
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Summary
This summary is machine-generated.

Nitrogen-doped porous carbon nanofibers with titanium dioxide (TiO2) nanoparticles create advanced lithium-ion battery anodes. These freestanding anodes exhibit enhanced capacity and stability for improved energy storage solutions.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Developing high-performance anodes is crucial for advancing lithium-ion battery technology.
  • Carbon nanofibers (CNFs) offer potential as anode materials due to their unique structure and conductivity.
  • Enhancing the electrochemical properties of CNFs requires innovative material design and doping strategies.

Purpose of the Study:

  • To fabricate and characterize novel freestanding anodes for lithium-ion batteries.
  • To investigate the effect of nitrogen doping and TiO2 nanoparticle seeding on the electrochemical performance of porous carbon nanofibers.
  • To evaluate the cycling stability and rate capability of the developed anode material.

Main Methods:

  • Fabrication of fibrous mats of nitrogen-doped porous carbon nanofibers with seeded TiO2 nanoparticles.
  • Punching mats into circular freestanding anodes for lithium-ion battery testing.
  • Electrochemical characterization including discharge capacity, coulombic efficiency, cycling stability, and rate performance testing.

Main Results:

  • The freestanding anode achieved an initial discharge capacity of 615 mAh g-1 and 322 mAh g-1 after 100 cycles at 100 mA g-1.
  • Superior rate performance was observed, with 179 mAh g-1 at a high current density of 2000 mA g-1.
  • The material demonstrated excellent cycling stability, withstanding an additional 800 cycles at 2000 mA g-1.

Conclusions:

  • Nitrogen doping and TiO2 nanoparticle seeding significantly enhance the electrochemical performance of porous carbon nanofibers.
  • The unique porous structure and improved conductivity contribute to increased active sites and lithium-ion transport.
  • The developed freestanding anodes exhibit promising potential for high-performance and stable lithium-ion batteries.