Journal of Synchrotron Radiation (Mar 2024)

Image registration for in situ X-ray nano-imaging of a composite battery cathode with deformation

  • Bo Su,
  • Guannan Qian,
  • Ruoyang Gao,
  • Fen Tao,
  • Ling Zhang,
  • Guohao Du,
  • Biao Deng,
  • Piero Pianetta,
  • Yijin Liu

DOI
https://doi.org/10.1107/S1600577524000146
Journal volume & issue
Vol. 31, no. 2
pp. 328 – 335

Abstract

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The structural and chemical evolution of battery electrodes at the nanoscale plays an important role in affecting the cell performance. Nano-resolution X-ray microscopy has been demonstrated as a powerful technique for characterizing the evolution of battery electrodes under operating conditions with sensitivity to their morphology, compositional distribution and redox heterogeneity. In real-world batteries, the electrode could deform upon battery operation, causing challenges for the image registration which is necessary for several experimental modalities, e.g. XANES imaging. To address this challenge, this work develops a deep-learning-based method for automatic particle identification and tracking. This approach was not only able to facilitate image registration with good robustness but also allowed quantification of the degree of sample deformation. The effectiveness of the method was first demonstrated using synthetic datasets with known ground truth. The method was then applied to an experimental dataset collected on an operating lithium battery cell, revealing a high degree of intra- and interparticle chemical complexity in operating batteries.

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