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Materials 2014, 7(6), 4455-4472; doi:10.3390/ma7064455

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

1
Deutsche ACCUmotive GmbH & Co. KG, Neue Straße 95, Kirchheim unter Teck 73230, Germany
2
Institute of Stochastics, Ulm University, Helmholtzstr. 18, Ulm 89069, Germany
3
Helmholtz-Zentrum Berlin, Hahn-Meitner-Platz 1, Berlin 14109, Germany
4
Daimler AG, HPC H152, Mercedesstr. 137, Stuttgart 70367, Germany
*
Author to whom correspondence should be addressed.
Received: 31 March 2014 / Revised: 26 May 2014 / Accepted: 28 May 2014 / Published: 12 June 2014
(This article belongs to the Special Issue New Energy Materials)
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Abstract

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. View Full-Text
Keywords: graphite; synchrotron tomography; Li-ion; preparation; degradation; porosity; tortuosity; multi-layer graphite; synchrotron tomography; Li-ion; preparation; degradation; porosity; tortuosity; multi-layer
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Mitsch, T.; Krämer, Y.; Feinauer, J.; Gaiselmann, G.; Markötter, H.; Manke, I.; Hintennach, A.; Schmidt, V. Preparation and Characterization of Li-Ion Graphite Anodes Using Synchrotron Tomography. Materials 2014, 7, 4455-4472.

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