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Facile Pyrolyzed N-Doped Binder Network for Stable Si Anodes.

Zhenggang Zhang1, Yang Jiang1,2, Zhe Peng1

  • 1Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences , Ningbo 315201, China.

ACS Applied Materials & Interfaces
|September 9, 2017
PubMed
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A novel pyrolyzed nitrogen-doped binder network enhances the cycling stability of raw silicon particles. This method significantly improves silicon anode performance for high-energy-density lithium-ion batteries.

Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Silicon (Si) anodes offer high theoretical capacity for lithium-ion batteries but suffer from poor cycling stability due to large volume expansion.
  • Existing nanoengineering strategies improve Si stability but lack facile methods for raw Si utilization.
  • Developing robust binders is crucial for practical Si-based anodes.

Purpose of the Study:

  • To develop a facile and effective method to enhance the cycling stability of raw silicon particles.
  • To investigate the role of a pyrolyzed nitrogen-doped binder network in stabilizing Si anodes.
  • To enable the use of raw silicon for high-energy-density lithium-ion batteries.

Main Methods:

  • Formation of a conformal pyrolyzed nitrogen-doped binder network using polyacrylonitrile.
Keywords:
binder networklithium-ion batteriespolyacrylonitrilepyrolysissilicon

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  • Encapsulation of raw silicon particles within the N-doped binder network.
  • Electrochemical cycling tests to evaluate the stability and capacity retention of Si anodes.

    • Main Results:

    • The pyrolyzed N-doped binder network effectively encapsulates raw Si particles, preventing pulverization.
    • Si particles embedded in the N-doped binder retained approximately 1700 mAh g⁻¹ discharge capacity at the 100th cycle.
    • Significant improvement in cycling stability compared to bare Si particles, which lost capacity by the 20th cycle.

    Conclusions:

    • A facile pyrolyzed N-doped binder network is a promising strategy to improve the cycling stability of raw Si anodes.
    • This approach overcomes the limitations of Si volume expansion, enabling practical high-energy-density lithium-ion batteries.
    • The N-doped binder network offers a cost-effective solution for advanced battery materials.