Here we demonstrate a method by which the same particles can be imaged before and after electrochemical testing within a commercially available electrode sheet, and thus a distinction of mechanically induced cracks and those resulting from the electrochemical stimulus can be made. Nano X-ray computed tomography (CT), which preserves the particle structure within an electrode matrix (i.e. is non-destructive), was utilised here with the addition of a specific electrode geometry. This method can allow for sequential imaging of an initially pristine particles within conditions typical of a bulk electrode and thus presents as a commercially relevant system in which to study cracking. Using a lasered micro-metre appendage as the electrode geometry, designed for limited field of view tomography techniques, the same particles were able to be located and assessed at two separate electrochemical cell potentials. This electrode geometry has been previously adopted as a rapid technique for sample preparation in nano-CT and thus utilised here to gather, for the first time, cracking information from a composite NMC811 electrode as a function of cell potential. Modelling of the fracture of Li-ion batteries is typically considered at various length scales: the homogenised single particle level, the agglomerated single particle in 2D and 3D, and the full electrode level. While Allen et al. provided insight into the damage behaviour of agglomerate particles at a variety of cycling rates (1C-9C), they did not capture the excessive damage that occurs at low charging rates at high voltages. Here, for the first time to the author's knowledge, we combine X-ray CT imaging and chemomechanical fracture modelling that describes the anisotropic lattice collapse-related mechanism, which leads to cracking at high voltages up to 4.5 V. Furthermore, we employ a phase field method that is mesh objective, overcoming the mesh dependency issues intrinsic to continuum damage models. The phase field method permits complex crack patterns in arbitrary geometries to be predicted and has been used in the description of fracture due to hydrogen embrittlement in oil and gas pipelines, as well as fracture in materials for nuclear reactors and in shape memory alloys, for example. It is possible to capture intergranular fracture using the phase field method and we present its use in capturing the intergranular, high voltage cracking of a 3D X-ray CT image-based agglomerate particle, while comparing the damage induced in the same particle before and after charging.