Mitsch Tim, Krämer Yvonne, Feinauer Julian, Gaiselmann Gerd, Markötter Henning, Manke Ingo, Hintennach Andreas, Schmidt Volker
Deutsche ACCUmotive GmbH & Co. KG, Neue Straße 95, Kirchheim unter Teck 73230, Germany.
Institute of Stochastics, Ulm University, Helmholtzstr. 18, Ulm 89069, Germany.
Materials (Basel). 2014 Jun 12;7(6):4455-4472. doi: 10.3390/ma7064455.
We present an approach for multi-layer preparation to perform microstructure analysis of a Li-ion cell anode active material using synchrotron tomography. All necessary steps, from the disassembly of differently-housed cells (pouch and cylindrical), via selection of interesting layer regions, to the separation of the graphite-compound and current collector, are described in detail. The proposed stacking method improves the efficiency of synchrotron tomography by measuring up to ten layers in parallel, without the loss of image resolution nor quality, resulting in a maximization of acquired data. Additionally, we perform an analysis of the obtained 3D volumes by calculating microstructural characteristics, like porosity, tortuosity and specific surface area. Due to a large amount of measurable layers within one stacked sample, differences between aged and pristine material (e.g., significant differences in tortuosity and specific surface area, while porosity remains constant), as well as the homogeneity of the material within one cell could be recognized.
我们提出了一种用于多层制备的方法，以使用同步加速器断层扫描对锂离子电池负极活性材料进行微观结构分析。详细描述了从拆解不同封装形式的电池（软包和圆柱形），到选择感兴趣的层区域，再到分离石墨化合物和集流体的所有必要步骤。所提出的堆叠方法通过并行测量多达十层，提高了同步加速器断层扫描的效率，而不会损失图像分辨率和质量，从而使采集的数据最大化。此外，我们通过计算微观结构特征，如孔隙率、曲折度和比表面积，对获得的三维体积进行分析。由于在一个堆叠样品中有大量可测量的层，可以识别老化材料和原始材料之间的差异（例如，曲折度和比表面积有显著差异，而孔隙率保持不变），以及单个电池内材料的均匀性。
