Characterization of the 3-dimensional microstructure of a graphite negative electrode from a Li-ion battery |
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Authors: | P.R. Shearing L.E. Howard P.S. Jørgensen N.P. Brandon S.J. Harris |
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Affiliation: | 1. Department of Earth Science and Engineering, Imperial College London, London, United Kingdom;2. Department of Mineralogy, The Natural History Museum, South Kensington, London, United Kingdom;3. Risø National Laboratory, Roskilde, Denmark;4. General Motors R&D Centre, Warren, Michigan, USA |
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Abstract: | The 3-dimensional microstructure of a porous electrode from a lithium-ion battery has been characterized for the first time. We use X-ray tomography to reconstruct a 43 × 348 × 478 μm sample volume with voxel dimensions of 480 nm, subsequent division of the reconstructed volumes into sub-volumes of different sizes allow us to determine microstructural parameters as a function of sub-division size. We show that the minimum size for a representative volume element is about 43 × 60 × 60 μm for volume-specific surface area, but as large as the full sample volume for porosity and tortuosity. |
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