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Publication Detail
The application of phase contrast X-ray techniques for imaging Li-ion battery electrodes
  • Publication Type:
    Journal article
  • Authors:
    Eastwood DS, Bradley RS, Withers PJ, Lee PD, Tariq F, Cooper SJ, Brandon NP, Taiwo OO, Brett DJL, Shearing PR, Gelb J, Merkle A
  • Publication date:
  • Journal:
    Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
  • Print ISSN:
In order to accelerate the commercialization of fuel cells and batteries across a range of applications, an understanding of the mechanisms by which they age and degrade at the microstructural level is required. Here, the most widely commercialized Li-ion batteries based on porous graphite based electrodes which de/intercalate Li ions during charge/discharge are studied by two phase contrast enhanced X-ray imaging modes, namely in-line phase contrast and Zernike phase contrast at the micro (synchrotron) and nano (laboratory X-ray microscope) level, respectively. The rate of charge cycling is directly dependent on the nature of the electrode microstructure, which are typically complex multi-scale 3D geometries with significant microstructural heterogeneities. We have been able to characterise the porosity and the tortuosity by micro-CT as well as the morphology of 5 individual graphite particles by nano-tomography finding that while their volume varied significantly their sphericity was surprisingly similar. The volume specific surface areas of the individual grains measured by nano-CT are significantly larger than the total volume specific surface area of the electrode from the micro-CT imaging, which can be attributed to the greater particle surface area visible at higher resolution. © 2014.
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