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Types of Semiconductors01:20

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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...

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Solid-state amorphization to alleviate severe volume expansion in silicon-based anodes.

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  • 1State Key Laboratory of Chemical Resources Engineering, Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing 100029, PR China.

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Amorphous silicon (aSi) anodes mitigate volume expansion issues in batteries. This isotropic porous aSi/graphite composite (aSG60) demonstrates enhanced stability and capacity for high-performance silicon anodes.

Keywords:
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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Crystalline silicon anodes suffer from anisotropic lithiation-induced expansion, causing stress and capacity fading.
  • This volume change limits the practical application of silicon in high-performance lithium-ion batteries.
  • Developing isotropic structures is crucial for stable silicon anode performance.

Purpose of the Study:

  • To synthesize isotropic porous amorphous silicon (aSi) for improved lithium-ion battery anodes.
  • To evaluate the electrochemical performance and volume stability of an aSi/graphite composite (aSG60).
  • To demonstrate the mitigation of volume expansion in silicon anodes through amorphous structuring.

Main Methods:

  • Preparation of isotropic porous amorphous silicon (aSi) via a simple and safe method.
  • Fabrication of an aSi/graphite composite (aSG60) through mechanical mixing.
  • Electrochemical testing of the aSG60 composite for capacity, cycling stability, and volume expansion.

Main Results:

  • The aSG60 composite exhibits a capacity of 1219.0 mAh g⁻¹ at 1 A g⁻¹.
  • It shows 70% capacity retention after 200 cycles.
  • The composite displays a significantly reduced volume expansion of 38% after 50 cycles compared to micro-silicon composites.

Conclusions:

  • Isotropic porous amorphous silicon effectively suppresses volume changes during lithium-ion battery cycling.
  • The aSi/graphite composite demonstrates excellent electrochemical performance and structural stability.
  • Amorphous silicon is a promising material for next-generation high-performance silicon-based anodes.