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Related Concept Videos

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Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Li segregation induces structure and strength changes at the amorphous Si/Cu interface.

Maria E Stournara1, Xingcheng Xiao, Yue Qi

  • 1School of Engineering, Brown University , Providence, Rhode Island 02912, United States.

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|September 5, 2013
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Lithiation causes lithium to segregate at silicon-copper interfaces, reducing adhesion and sliding resistance. This finding is crucial for designing stable, high-capacity silicon electrodes for lithium-ion batteries.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Computational Chemistry

Background:

  • Designing nanostructured electrodes for lithium-ion batteries requires understanding interfacial properties, especially during lithiation.
  • Silicon electrodes offer high capacity but face challenges like volume expansion, mechanical stress, and delamination.

Purpose of the Study:

  • To investigate the effect of lithiation on the amorphous silicon/copper (a-Si/Cu) interface.
  • To elucidate the role of lithium segregation in altering interfacial properties.

Main Methods:

  • Combined density functional theory (DFT) and ab initio molecular dynamics (AIMD) calculations.
  • Time-of-flight secondary ion mass spectrometry (TOF-SIMS) for lithium depth profiling.

Main Results:

  • Demonstrated significant lithium segregation (over 20%) at the lithiated a-Si/Cu interface.
  • Observed a decrease in adhesion strength (up to 16%) and a dramatic reduction in sliding resistance (by one order of magnitude).
  • Attributed the reduced sliding resistance to a shift from covalent to metallic bonding at the interface.

Conclusions:

  • Lithium segregation at the a-Si/Cu interface significantly modifies its mechanical properties.
  • Findings provide insights for developing models and designing robust silicon electrodes for advanced lithium-ion batteries.