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An Ultrastable Integrated Anode with ∼95 wt.% SiO via In Situ Electrode-Scale Conformal Coating.

Yuchen Wang1,2, Shuqi Wang2, Lingxiao Xue2

  • 1Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, College of Materials Science and Engineering, Hunan University, Changsha 410082, China.

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|January 2, 2025
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Summary

Researchers developed a new silicon oxide (SiO) anode for high-energy batteries. This integrated electrode design enhances mechanical stability and achieves high capacity retention, paving the way for advanced battery technology.

Keywords:
SEI formation mechanismintegrated electrodelithium-ion batterymicrosized SiOxthree-dimensional conductive networkultrahigh active material content

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Silicon oxide (SiO)-based anodes are promising for high-energy density batteries.
  • Mechanical integrity issues and low active material content hinder SiO anode performance.
  • Existing research often overlooks interparticle connection enhancement.

Purpose of the Study:

  • To design an integrated electrode with strong covalent bonding for enhanced mechanical stability.
  • To achieve a high active material content (∼95 wt.% SiO) in the anode.
  • To investigate the synergistic effects of electron dispersion and stress mitigation.

Main Methods:

  • Fabrication of an integrated SiO electrode with in situ binder copolymerization via thermal treatment.
  • Characterization of electrode mechanical stability and electrochemical performance.
  • Investigation of the solid electrolyte interphase (SEI) formation mechanism.

Main Results:

  • Achieved excellent mechanical stability with ∼95 wt.% SiO content.
  • Delivered a capacity of 1277 mAh g-1 and 81.82% retention after 250 cycles.
  • Assembled full-cell demonstrated 91.33% initial Coulombic efficiency and 400.05 Wh kg-1 energy density.

Conclusions:

  • The integrated electrode design provides a facile, scalable method for developing high-performance SiO anodes.
  • Strong covalent bonding and a 3D conductive matrix significantly improve structural integrity and restrain volume expansion.
  • This approach enables ultrahigh active material proportion in microsized SiO anodes, advancing battery technology.