3D data on an 18650 Li-ion Battery Electrode Assembly with Nickel-Rich NMC811 Cathode and Graphite-Silicon Anode X-ray micro-computed tomography of the lower middle of an 18650 cell.Collected using a Zeiss Xradia 520 Versa, Carl Zeiss., CA, USA.Accelerating tube voltage of 120 kVp.Stationary tungsten anode on a copper substratePolychromatic beam with a characteristic emission peak at 58 keV (W-Kα).4500 X-ray radiograph projections collected.10 second exposure per projection.The per-reconstruction data can be available upon request from t.heenan@ucl.ac.uk - request data 'EIL-002'This is one of four datasets obtained from the same cell, see also:EIL-005.tif, EIL-007.tif & EIL-008.tif.Reconstructed using commercial software (‘Reconstructor Scout-and-Scan’, Carl Zeiss., CA, U.S.A.).Isotropic voxel length of 10.4 µm in all four datasets.