Compton scattering imaging of a working battery using synchrotron high-energy X-rays

Results of studies on Compton scattering imaging using synchrotron high‐energy X‐rays are reported. The technique is applied to a discharging coin cell, and the intensity of Compton scattered X‐rays from the inside of the cell has been measured as a function of position and time. The position–time intensity map captures the migration of lithium ions in the positive electrode and reveals the structural change due to the volume expansion of the electrode. This experiment is a critical step in developing synchrotron‐based Compton scattering imaging for electrochemical cells at a product level.