Analysis of Three-dimensional Porous Network Structure of Li-ion Battery Electrodes

Abstract

The porous network structure of Li-ion battery electrodes has been first studied by combining the X-ray computed tomography (CT) technology and the three-dimensional image processing using medial axis. High resolution X-ray CT images of the electrodes were obtained at the synchrotron facility. Gallium injection technique was utilized to obtain a high contrast CT image for anode, so that the material and void are clearly separated in the further image processing. The tortuosity of voids in x-, y-, and z-directions was calculated after thinning process. The path of Li ion in electrodes is visualized and analyzed by this method. This analysis may accelerate the research and development of Li-ion battery electrode.

Development of In Situ Cross-Sectional Raman Imaging of LiCoO₂ Cathode for Li-ion Battery

“…Also, the three-dimensional structure of the vacancy in electrodes has been well-studied by both simulation, 22,23 and instrumental analysis. [24][25][26][27][28] In situ Raman spectroscopy techniques are suitable tool to observe the distribution of the state of charge (SOC) in the composite electrodes because Raman spectra are sensitive to the structure of electrode materials. Hence, many efforts have been made to develop in situ techniques.…”