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Proceedings Paper

Laser generated microstructures in tape cast electrodes for rapid electrolyte wetting: new technical approach for cost efficient battery manufacturing
Author(s): W. Pfleging; R. Kohler; J. Pröll
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Paper Abstract

Three-dimensional (3D) battery architectures are under current scientific investigation since they can achieve large areal energy capacities while maintaining high power densities. A main objective of surface patterning is the enhancement of lithium-ion diffusion which is often a limiting factor in lithium-ion cells. By using a rather new approach, laser material processing of thick-film electrodes has been investigated for the precise adjustment of 3D surface topography. Besides lithium-ion diffusion in electrode materials as an electrochemically limited process, a critical step in lithium-ion pouch cell manufacturing is the homogeneous electrolyte wetting of stacked electrodes and separators. This process requires cost expensive and time-consuming vacuum and storage processes at elevated temperatures. A new and cost efficient laser process has been successfully applied in order to significantly improve the electrode wetting and the battery operation. Preliminary investigations for testing the process on pouch cell geometry revealed higher capacities and increased cell life-time compared to standard cells without storage processes at elevated temperatures. The laser structuring process can be applied to commercial electrode materials and integrated into existing production lines.

Paper Details

Date Published: 6 March 2014
PDF: 8 pages
Proc. SPIE 8968, Laser-based Micro- and Nanoprocessing VIII, 89680B (6 March 2014); doi: 10.1117/12.2039635
Show Author Affiliations
W. Pfleging, Karlsruhe Institute of Technology (Germany)
Karlsruhe Nano Micro Facility (Germany)
R. Kohler, Karlsruhe Institute of Technology (Germany)
J. Pröll, Karlsruhe Institute of Technology (Germany)

Published in SPIE Proceedings Vol. 8968:
Laser-based Micro- and Nanoprocessing VIII
Udo Klotzbach; Kunihiko Washio; Craig B. Arnold, Editor(s)

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