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Electron backscatter diffraction applied to lithium sheets prepared by broad ion beam milling.

Nicolas Brodusch1, Karim Zaghib, Raynald Gauvin

  • 1Mining and Materials Engineering Department, McGill University, Montréal, Québec, Canada.

Microscopy Research and Technique
|October 4, 2014
PubMed
Summary

Pure lithium sheets for lithium-ion batteries were characterized using electron backscatter diffraction (EBSD) and energy dispersive spectroscopy (EDS). Argon ion milling enabled accurate microstructural and impurity analysis without conventional polishing.

Keywords:
EBSDMonte CarloSRIMion etchinglithium ion battery

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Analytical Chemistry

Background:

  • Pure lithium's low hardness and atomic number complicate conventional preparation for microscopy.
  • Lithium metal is crucial as a base electrode material in advanced lithium-ion battery technologies.
  • Surface analysis requires damage-free preparation methods to accurately characterize materials.

Purpose of the Study:

  • To characterize the microstructure and microtexture of pure lithium metallic sheets.
  • To identify impurities present in lithium sheets used for battery electrodes.
  • To evaluate the effectiveness of argon ion milling for preparing lithium surfaces for analysis.

Main Methods:

  • Surface preparation using broad argon ion milling (IM) without conventional grinding or polishing.
  • Microstructural and microtextural analysis via electron backscatter diffraction (EBSD).
  • Impurity characterization using X-ray microanalysis with energy dispersive spectroscopy (EDS).

Main Results:

  • Argon ion milling provided a sufficiently damage-free surface for accurate EBSD and EDS analysis.
  • EDS successfully identified and characterized impurities within the lithium sheets.
  • EBSD accurately revealed the microstructure and microtexture of the pure lithium material.
  • Beam damage and oxidation/hydration were estimated to be less than 50 nm.
  • The study suggests minimizing heating effects during milling, potentially using a cryo-stage.

Conclusions:

  • Broad argon ion milling is an effective method for preparing pure lithium surfaces for advanced microscopy techniques.
  • This approach allows for accurate characterization of microstructure, microtexture, and impurities in lithium battery electrode materials.
  • Minimizing thermal artifacts during milling is important for reliable surface analysis of sensitive materials like pure lithium.