DataVXBatteries & SupercapsPaper
journal article·2021-02Open access

Heterogeneity of Graphite Lithiation in State‐of‐the‐Art Cylinder‐Type Li‐Ion Cells

Dominik Petz, Martin J. Mühlbauer, Alexander Schökel, Klaus Achterhold, Franz Pfeiffer, Thilo Pirling, Michael Hofmann, Anatoliy Senyshyn

Batteries & Supercaps· Volume 4· Issue 2
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Source abstract

Abstract

Abstract The two‐dimensional lithium distribution in the graphite anode was non‐destructively probed by spatially resolved neutron diffraction for a batch consisting of 34 different cylinder‐type (18650) Li‐ion batteries in fully charged state. The uniformity of the lithium distribution was quantified and correlated to the cell specifications/electrochemistry and to intrinsic cell parameters like electrode thickness, position of current collectors, etc. which were obtained by X‐ray micro‐computed tomography. Non‐uniformities in the lithiation state of the anode from a constant plateau have been observed for the majority of the studied cells. Their location corresponds to the positions of current tabs connecting the electrode stripes and areas of incomplete electrode coating at the beginning and the end of the electrode stripes. Four commonly used schemes of current lid connection were identified. Each of them displays its own effect on the uniformity of the lithiation at the anode and, therefore, variation of the intrinsic state‐of‐charge distribution and, most probably, the ageing behavior of the electrodes.
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Research context

Energy storage

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Technologies Research · Advanced Battery Materials and Technologies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Heinz Maier-Leibnitz Zentrum (MLZ) Technische Universität München Lichtenbergstr. 1 85748 Garching Germany

Lehrstuhl für funktionelle Materialien, E13 Technische Universität München James-Franck-Str. 1/I 85748 Garching b. München Germany

Helmholtz-Institute Ulm for Electrochemical Energy Storage (HIU) Karlsruhe Institute of Technology (KIT) P.O. Box 3640 D-76021 Karlsruhe Germany

Institute for Applied Materials (IAM) Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany

Deutsches Elektronen Synchrotron (DESY) Notkestr. 85 22607 Hamburg Germany

Department of Physics & Munich School of Bioengineering Technische Universität München James-Franck-Straße 1 85748 Garching Germany

Department of Diagnostic and Interventional Radiology Munich School of Medicine and Klinikum rechts der Isar Ismaninger Str. 22 81675 Munich Germany

Institut Max von Laue – Paul Langevin (ILL) 71, Avenue des Martyrs 38043 Grenoble Cedex 9 France

Funding

Deutsche Forschungsgemeinschaft

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