Greifswald 2024 – wissenschaftliches Programm
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SYEC: Symposium Lasers and Photonic Technologies for Environmental Challenges
SYEC 1: Laser-Based Micro-/Nanostructuring for Environmental Challenges
SYEC 1.2: Hauptvortrag
Dienstag, 27. Februar 2024, 11:40–12:10, ELP 6: HS 1
Laser surface modification of graphite anodes for lithium-ion batteries with improved fast-charging capability — •Max-Jonathan Kleefoot1,3, Jens Sandherr1, Jiri Martan2, Volker Knoblauch1, and Harald Riegel1 — 1LaserApplicationCenter (LAZ), Aalen University, Beethovenstraße 1, 73430 Aalen, Germany — 2New Technologies Research Centre (NTC), University of West Bohemia, Plzen, Czech Republic — 3Department of Machining Technology, Faculty of Mechanical Engineering (FST), University of West Bohemia, Pilsen, Czech Republic
In order to fulfil the high energy density requirements of lithium-ion batteries used in battery electric vehicles, electrodes with high active mass loading and low porosity or high compaction are required. However, such high-energy electrodes have a significantly lower rate capability, which is mainly a consequence of the limited lithium-ion diffusion. Laser-based microstructure adaptations can help to partially overcome the conflict of objectives between energy and power density. Various approaches such as the selective removal of binder components on the surface or the perforation of the electrode layer as deep structuring were investigated for this purpose. The aim of the work was to gain a better understanding of the machining processes but also to investigate the resulting performance of the electrode. It could be shown that the investigated processes lead to an significantly improved electrode performance in the fields of fast charging capability, wetting and lifetime compared to unprocessed electrodes.
Keywords: li-ion batteries; selective laser ablation; perforation; fast-charging; graphite anode