This talk reviews the use of focused ion beam – scanning electron microscopy (FIB-SEM) and transmission X-ray microscopy (TXM) to obtain three-dimensional tomographic images of commercial lithium-ion battery electrodes such as LiFePO4, LiCoO2, and LiCoO2/Li(Ni1/3Mn1/3Co1/3)O2 composite. After briefly reviewing the measurement techniques, the structural results are described, including imaging of both oxide and carbon phases.
Attempts to correlate changes in electrode microstructure with changes in cell performance after cycling are described. Three-dimensional simulations of the LiCoO2 electrode charge/discharge process based on measured three-dimensional microstructures is discussed.
Scott A Barnett and Zhao Liu, Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL, 60208, USA