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Manufacturing Process for Improved Ultra‐Thick Cathodes in High‐Energy Lithium‐Ion Batteries

Kremer, Lea and Hoffmann, Alice and Danner, Timo and Hein, Simon and Prifling, Benedikt and Westhoff, Daniel and Dreer, Christian and Latz, Arnulf and Schmidt, Volker and Wohlfahrt-Mehrens, Margret (2019) Manufacturing Process for Improved Ultra‐Thick Cathodes in High‐Energy Lithium‐Ion Batteries. Energy Technology (190016). Wiley. DOI: 10.1002/ente.201900167 ISSN 2194-4288

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Official URL: https://onlinelibrary.wiley.com/doi/full/10.1002/ente.201900167

Abstract

The effect of the mixing and drying process on the microstructure of ultra‐thick NCM 622 cathodes (50 mg cm−2, 8 mAh cm−2) and its implication for battery performance is investigated. It is observed that the shear force during the mixing process significantly influences the resulting microstructure with regard to binder migration during the drying process. Based on the information extracted from scanning electron microscopy–energy dispersive X‐ray spectroscopy (SEM–EDX) cross sections, the carbon binder domain (CBD) is distributed in the pore space of virtual electrodes generated by a stochastic 3D microstructure model. Simulations predict a CBD configuration that leads to optimal performance of the electrode. Furthermore, it is shown that a low drying rate has a beneficial influence toward the rate capability of the ultra‐thick cathodes. The specific energy of an ultra‐thick cathode is 18% higher compared with a cathode prepared according to the state of the art. With an improved process in a pilot scale, the advantage can be kept up to current densities of at least 3 mA cm−².

Item URL in elib:https://elib.dlr.de/132131/
Document Type:Article
Title:Manufacturing Process for Improved Ultra‐Thick Cathodes in High‐Energy Lithium‐Ion Batteries
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kremer, LeaZSW UlmUNSPECIFIED
Hoffmann, AliceZSW 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
Prifling, BenediktUniversity of UlmUNSPECIFIED
Westhoff, DanielUniversity of UlmUNSPECIFIED
Dreer, ChristianZSW UlmUNSPECIFIED
Latz, ArnulfArnulf.Latz (at) dlr.dehttps://orcid.org/0000-0003-1449-8172
Schmidt, VolkerUniversity of UlmUNSPECIFIED
Wohlfahrt-Mehrens, MargretZSWUNSPECIFIED
Date:17 April 2019
Journal or Publication Title:Energy Technology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1002/ente.201900167
Publisher:Wiley
ISSN:2194-4288
Status:Published
Keywords:battery; production; mixing; thick electrodes;
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 15:42
Last Modified:19 Dec 2019 15:42

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