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Engineering of Silicon Core-Shell Structures for Li-ion Anodes.

Bastien Rage1, Diane Delbegue2, Nicolas Louvain1,3

  • 1ICGM, Univ Montpellier, CNRS, ENSCM, Montpellier, France.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|September 10, 2021
PubMed
Summary

Silicon anode materials for lithium-ion batteries face challenges due to volume changes. Core-shell structures offer solutions by improving stability and cycle life for better battery performance.

Keywords:
Si anodescoatingscore-shell structureslithium-ion batteriessurface protection

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Silicon's high capacity makes it ideal for Li-ion battery anodes, but large volume changes during cycling cause degradation.
  • These volume changes lead to electrical contact loss, mechanical failure, and unstable solid electrolyte interphase (SEI) formation, limiting cycle life.

Purpose of the Study:

  • To provide a comprehensive review of silicon-based core-shell structures as anode materials for Li-ion batteries.
  • To analyze various design, synthesis, and electrochemical performance strategies for these core-shell materials.
  • To summarize the pros and cons of different silicon core-shell coatings.

Main Methods:

  • Literature review of silicon-based core-shell structures.
  • Analysis of different coating types: carbon, inorganic, organic, and double-layer.
  • Evaluation of electrochemical performance and stability.

Main Results:

  • Core-shell structures effectively mitigate volume expansion issues in silicon anodes.
  • Various shell materials (carbon, inorganic, organic) demonstrate potential in enhancing electronic conductivity, ionic diffusion, and buffering volume changes.
  • Different coating strategies offer distinct advantages and disadvantages impacting cycle life and performance.

Conclusions:

  • Silicon-based core-shell architectures are a promising strategy to overcome the limitations of silicon anodes in Li-ion batteries.
  • The choice of shell material and coating strategy is crucial for optimizing electrochemical performance and long-term stability.
  • Further research into advanced core-shell designs can lead to next-generation high-performance batteries.