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This study introduces an integrated helical fiber electrode (IHFE) for fiber lithium-ion batteries (FLIBs), significantly improving fast-charging capability and cycling stability for wearable electronics.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Fiber lithium-ion batteries (FLIBs) are crucial for wearable electronics but limited by slow ion diffusion.
  • Sluggish Li+ diffusion kinetics hinder rate capability and power output in conventional FLIBs.

Purpose of the Study:

  • To enhance Li+ transport kinetics in high-loading fiber electrodes.
  • To improve the rate capability and cycling stability of FLIBs for practical applications.

Main Methods:

  • Proposed an integrated helical fiber electrode (IHFE) configuration.
  • Designed IHFE with a helical-wound ultrafine metal wire around a solid skeleton.
  • Investigated the impact of IHFE on specific surface area and ion transport path.

Main Results:

  • IHFE increased specific surface area by 71.93% and shortened Li+ transport path by 25%.
  • High-loading FLIBs with IHFE achieved 77.48% capacity retention at 4C (15-minute fast charging), a 32.02% improvement over conventional electrodes.
  • IHFE-based FLIBs showed 75.53% capacity retention after 300 cycles at 4C, demonstrating enhanced cycling stability.

Conclusions:

  • The IHFE configuration effectively optimizes Li+ diffusion kinetics in FLIBs.
  • This design significantly enhances fast-charging performance and long-term cycling stability.
  • Demonstrated practical feasibility through stable operation of an Ah-level energy textile.