Preparation and Characterization of Li-Ion Graphite Anodes Using Synchrotron Tomography

Materials

Tim Mitsch⁴  Yvonne Krämer⁴  Julian Feinauer⁴  Gerd Gaiselmann¹  Henning Markötter³  Ingo Manke³  Andreas Hintennach² 

[1] Institute of Stochastics, Ulm University, Helmholtzstr. 18, Ulm 89069, Germany; E-Mails:;Daimler AG, HPC H152, Mercedesstr. 137, Stuttgart 70367, Germany; E-Mail:;Helmholtz-Zentrum Berlin, Hahn-Meitner-Platz 1, Berlin 14109, Germany; E-Mails:;Deutsche ACCUmotive GmbH & Co. KG, Neue Straße 95, Kirchheim unter Teck 73230, Germany; E-Mails:

关键词: graphite;    synchrotron tomography;    Li-ion;    preparation;    degradation;    porosity;    tortuosity;    multi-layer;   

DOI  :  10.3390/ma7064455

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland