Marcus Johansen, Mahander P Singh, Baptiste Gault, Fang Liu
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Suppressing Lithium Migration in a Carbon Fiber Negative Electrode During Atom Probe Tomography Analysis.
Carbon fibers can play dual roles, carrying mechanical load and hosting lithium (Li) simultaneously in multifunctional devices called structural batteries. It is essential to gain a detailed understanding on the interaction between Li and carbon fibers on the nanoscale. Atom probe tomography (APT) can potentially reveal individual Li and C atoms. However, lithiated carbon fibers experience massive Li migration once exposed to the electric field in the APT instrument. We show that a few nanometers of a chromium (Cr) coating on APT specimens can shield the electric field and suppress the massive Li migration. The related effects of the Cr coating, such as introduction of oxygen, enhanced mass resolving power of the mass spectrum, and increased portion of single hits, are also discussed.
期刊介绍:
Microscopy and Microanalysis publishes original research papers in the fields of microscopy, imaging, and compositional analysis. This distinguished international forum is intended for microscopists in both biology and materials science. The journal provides significant articles that describe new and existing techniques and instrumentation, as well as the applications of these to the imaging and analysis of microstructure. Microscopy and Microanalysis also includes review articles, letters to the editor, and book reviews.