Resolving the state of lithiation of secondary LiCoO2 particles within a cylindrical Li ion battery with high resolution region-of-interest

The aim of the experiment is to resolve the secondary particles (ca. 10-20 μm in diameter) present in the positive electrode of a cylindrical Li-ion battery with X-ray diffraction imaging. To achieve this, region-of-interest X-ray diffraction computed tomography (XRD-CT) scans will be conducted on a pin-type Panasonic CG-320B battery, which has a small outer diameter of approximately 3.5 mm. Despite its diminutive size, this battery incorporates the same technology (jelly roll) as its larger counterparts. The objective is to achieve a high-resolution visualization of the secondary particles within the LiCoO2 positive electrode at two battery states (charged/discharged) and gain a unique insight the Li-ion heterogeneities we have previously first reported at the electrode level.