Solid state batteries have attracted extensive attention, but the lithium penetration through the solid electrolyte remains a critical barrier to commercialisation and is not yet fully understood. In this study, the 3D morphological evolution of cracks with deposited lithium were tracked as they penetrated through the solid electrolyte during repetitive plating. This is achieved by utilising in-situ synchrotron X-ray computed tomography with high spatial and temporal resolutions. Thin-sheet cracks were observed to penetrate the solid electrolyte without immediate short-circuiting of the cell. Changes in their width and volume were quantified. By calculating the volume of deposited lithium, it was found that the lithium was only partially filled in cracks, and its filling ratio quickly dropped from 94.95% after the 1st plating to ca. 20% after the 4th plating. The filling process was revealed through tracking the line profile of grayscale along cracks. It was found that lithium grew much more slowly than cracks, so that the cracks near the cathode side were largely hollow and the cell could continue to operate. The deposited lithium after short circuit was segmented and its distribution was visualised. DVC analysis was applied to map local high stress and strain, which aggregated along cracks and significantly increased at areas where new cracks formed.

固态电池已经引起了广泛的关注，但是锂穿过固态电解质的渗透仍然是商业化的关键障碍，并且尚未被完全理解。在这项研究中，在重复电镀过程中，当沉积的锂穿过固体电解质时，其裂纹的3D形态演化过程得以追踪。这是通过利用具有高空间和时间分辨率的原位同步加速器X射线计算机断层扫描来实现的。观察到薄片裂缝穿透了固体电解质，而没有电池的立即短路。量化其宽度和体积的变化。通过计算锂的沉积量，发现锂仅部分地填充在裂纹中，并且其填充率从第一次镀覆后的94.95％迅速下降至约4.5％。第四次电镀后20％。通过跟踪沿着裂纹的灰度线轮廓来揭示填充过程。发现锂的生长比裂纹要慢得多，因此阴极侧的裂纹大部分是中空的，并且电池可以继续运行。短路后沉积的锂被分割并可视化其分布。DVC分析用于绘制局部高应力和应变图，这些应力和应变沿裂纹聚集，并在形成新裂纹的区域显着增加。短路后沉积的锂被分割并可视化其分布。DVC分析用于绘制局部高应力和应变图，这些应力和应变沿裂纹聚集，并在形成新裂纹的区域显着增加。短路后沉积的锂被分割并可视化其分布。DVC分析用于绘制局部高应力和应变图，这些应力和应变沿裂纹聚集，并在形成新裂纹的区域显着增加。