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Analysis of microstructural effects in multi-layer lithium-ion battery cathodes

Westhoff, Daniel and Danner, Timo and Hein, Simon and Scurtu, Rares and Kremer, Lea and Hoffmann, Alice and Hilger, Andre and Manke, Ingo and Wohlfahrt-Mehrens, Margret and Latz, Arnulf and Schmidt, Volker (2019) Analysis of microstructural effects in multi-layer lithium-ion battery cathodes. Materials Characterization (151), pp. 166-174. Elsevier. DOI: 10.1016/j.matchar.2019.02.031 ISSN 1044-5803

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Official URL: https://www.sciencedirect.com/science/article/pii/S1044580318319089?via%3Dihub

Abstract

A possible way to increase the energy density in lithium-ion batteries, and, at the same time, reduce the production costs, is to use thicker electrodes. However, transport limitations can occur in thick electrodes, leading to a drawback in performance. A way to mitigate this problem is a more sophisticated microstructure of the electrode, using, e.g., structural gradients. This can, for instance, be achieved by multi-layer casting, i.e., casting and drying of a first layer, and then adding a second layer. An important question is how the interface between the two layers is shaped and how the corresponding microstructure influences the electrochemical performance. In the present paper, two different two-layer cathodes are analyzed and compared to single-layer cathodes of the same thickness. The analysis involved tomographic imaging, a statistical analysis of the 3D microstructure of the active material particle systems with a focus on the interface between the layers, and electrochemical characterization of the active material systems using experimental measurements as well as electrochemical simulations. The analysis showed that at the interface the connectivity of active material particles decreases, which results in higher electric resistivity. This effect is stronger if an intermediate calendering step is performed, i.e., the first layer is calendered before casting the second layer.

Item URL in elib:https://elib.dlr.de/132129/
Document Type:Article
Title:Analysis of microstructural effects in multi-layer lithium-ion battery cathodes
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Westhoff, DanielUniversity of UlmUNSPECIFIED
Danner, TimoTimo.Danner (at) dlr.dehttps://orcid.org/0000-0003-2336-6059
Hein, SimonSimon.Hein (at) dlr.dehttps://orcid.org/0000-0002-6728-9983
Scurtu, RaresZSW UlmUNSPECIFIED
Kremer, LeaZSW UlmUNSPECIFIED
Hoffmann, AliceZSW UlmUNSPECIFIED
Hilger, AndreHZ BerlinUNSPECIFIED
Manke, IngoHZ BerlinUNSPECIFIED
Wohlfahrt-Mehrens, MargretZSWUNSPECIFIED
Latz, Arnulfarnulf.latz (at) dlr.dehttps://orcid.org/0000-0003-1449-8172
Schmidt, VolkerUniversity of UlmUNSPECIFIED
Date:5 March 2019
Journal or Publication Title:Materials Characterization
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.matchar.2019.02.031
Page Range:pp. 166-174
Publisher:Elsevier
ISSN:1044-5803
Status:Published
Keywords:Lithium-ion batteries; Multi-layer electrodes; Microstructure; Tomography; Image analysis
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Electrochemical Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Electrochemical Prcesses (Batteries)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Computational Electrochemistry
Deposited By: Danner, Timo
Deposited On:19 Dec 2019 15:41
Last Modified:19 Dec 2019 15:41

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