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Stabilizing the Bulk-Phase and Solid Electrolyte Interphase of Silicon Microparticle Anode by Constructing

Liang Ma1,2, Youyou Fang1,2, Ni Yang2

  • 1School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China.

Advanced Materials (Deerfield Beach, Fla.)
|April 24, 2024
PubMed
Summary

A novel gradient-hierarchically ordered conductive (GHOC) network stabilizes silicon microparticle (µSi) anodes, significantly improving cycling performance for high-energy lithium-ion batteries.

Keywords:
LiF‐enriched seibulk‐phase and interphase structuregradient‐hierarchically ordered conductive networkstempo‐cnfti3c2tx

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Silicon microparticles (µSi) offer high theoretical capacity for lithium-ion batteries but suffer from poor stability.
  • Internal stress and unstable solid electrolyte interphase (SEI) formation hinder the practical application of µSi anodes.
  • Developing robust structures is crucial for enhancing the electrochemical performance of silicon anodes.

Purpose of the Study:

  • To engineer a gradient-hierarchically ordered conductive (GHOC) network structure for stabilizing µSi anodes.
  • To improve both the bulk-phase and interphase stability of µSi anodes.
  • To enhance the cycling performance and commercial viability of high-energy-density lithium-ion batteries.

Main Methods:

  • Fabrication of a GHOC network using 2D transition metal carbides (Ti3C2Tx) and 1D Tempo-oxidized cellulose nanofibers (TCNF) with polyacrylic acid (PAA).
  • Characterization of the structural integrity and conductive pathways within the GHOC network.
  • Electrochemical testing of µSi-MTCNF-PAA anodes in lithium-ion battery configurations.

Main Results:

  • The GHOC network effectively stabilized the bulk-phase and SEI of µSi anodes.
  • Ti3C2Tx contributed to a LiF-enriched SEI layer, enhancing stability.
  • The µSi-MTCNF-PAA anode achieved a high discharge capacity of 1413.7 mAh g⁻¹ after 500 cycles at 1.0 C.
  • A full cell demonstrated 92.0% capacity retention after 50 cycles.

Conclusions:

  • The proposed GHOC network structure provides an effective strategy for stabilizing anode materials with high volumetric strain.
  • This approach significantly enhances the cycling stability and energy density of silicon-based lithium-ion batteries.
  • The findings pave the way for advanced anode materials in next-generation energy storage solutions.