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Related Experiment Video

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Fluorine-Doping Carbon-Modified Si/SiOx to Effectively Achieve High-Performance Anode.

Zhixian You1,2,3, Cheng Lin1,2,3, Pingping Zheng1,2,3

  • 1College of Physics and Energy, Fujian Provincial Solar Energy Conversion and Energy Storage Engineering Technology Research Center, Fujian Normal University, Fuzhou, 350117, China.

Small (Weinheim an Der Bergstrasse, Germany)
|November 6, 2024
PubMed
Summary

This study introduces fluorine-doped carbon-coated silicon/silicon oxide (Si/SiOx@F-C) composites for enhanced lithium-ion batteries (LIBs). These advanced anodes demonstrate improved cycling stability and initial coulombic efficiency (ICE) for better energy storage.

Keywords:
Si/SiOx anodesfluorine‐doped carbon coatingsimproved interfacial compatibilitylithium‐ion batterieslong‐cycle battery life

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Silicon-based anodes are crucial for high-performance lithium-ion batteries (LIBs) but suffer from poor cycling stability, low initial coulombic efficiency (ICE), and interface issues.
  • Existing silicon/silicon oxide (Si/SiOx) anodes require improved strategies to overcome inherent limitations for practical applications.

Purpose of the Study:

  • To develop high-performance Si/SiOx@F-C composites by in situ coating a fluorine-doped carbon layer on Si/SiOx.
  • To enhance the electrochemical performance, cycling stability, and interfacial compatibility of silicon-based anodes for LIBs.

Main Methods:

  • Preparation of Si/SiOx@F-C composites via high-temperature pyrolysis with in situ fluorine-doped carbon coating.
  • Electrochemical testing of Si/SiOx@F-C electrodes in LIBs, including cycling, rate capability, and long-term stability assessments.
  • Material characterization to analyze the structure, conductivity, and interface properties of the fluorine-doped carbon layer.

Main Results:

  • Si/SiOx@F-C electrodes achieved a high ICE of 79%, significantly outperforming Si/SiOx@C (71%) and Si/SiOx (43%).
  • Excellent rate performance was observed, retaining 603 mAhg⁻¹ at 5000 mAg⁻¹.
  • Exceptional long-term cycling stability was demonstrated, with 829 mAhg⁻¹ at 1000 mAg⁻¹ over 1400 cycles and 588 mAhg⁻¹ at 3000 mAg⁻¹ over 2400 cycles (82.12% retention).

Conclusions:

  • The fluorine-doped carbon layer effectively enhances electrical conductivity and prevents structural degradation of Si/SiOx anodes.
  • Increased LiF concentration in the solid electrolyte interface (SEI) film due to fluorine doping improves interfacial compatibility.
  • The straightforward and effective Si/SiOx@F-C composite preparation offers a promising route for advanced silicon anodes in LIBs.