In-Situ Synchrotron Computed Tomography on optimised Na Solid State Satteries with new Anodes based on Carbon Skeletons

Na-based solid-state batteries (SSBs) offer high energy density and safety, which are among the main goals of current battery research. Unlike Li-SSBs, it is not possible to use Na-metal electrodes, so a novel carbon framework structure is used as the anode, which prevents direct contact with the highly Na+ conducting sulfur solid electrolytes (SE). However, Na-SSBs undergo large volume changes and this process is accompanied by cracking, especially at the interfaces. In this study, we will use in-situ synchrotron computed tomography (SCT) to study novel Na-SSBs as a function of pressure to get inside local volume changes and resulting cracks, displacements that are often associated with plating/stripping of Na. Of particular interest is the question of the reversibility of these processes. These questions can only be answered by SCT, as other methods are either destructive and/or don't allow such high pressures.