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Laser cutting is a promising technology for the singulation of conventional and advanced electrodes for lithium-ion batteries. Even though the continuous development of laser sources, beam guiding, and handling systems enable industrial relevant high cycle times, there are still uncertainties regarding the influence of, for this process, typical cutting edge characteristics on the electrochemical performance. To investigate this issue, conventional anodes and cathodes were cut by a pulsed fiber laser with a central emission wavelength of 1059–1065 nm and a pulse duration of 240 ns. Based on investigations considering the pulse repetition frequency, cutting speed, and line energy, a cell setup of anodes and cathodes with different cutting edge characteristics were selected. The experiments on 9 Ah pouch cells demonstrated that the cutting edge of the cathode had a greater impact on the electrochemical performance than the cutting edge of the anode. Furthermore, the results pointed out that on the cathode side, the contamination through metal spatters, generated by the laser current collector interaction, had the largest impact on the electrochemical performance.
Tobias Jansen; Maja W. Kandula; Sven Hartwig; Louisa Hoffmann; Wolfgang Haselrieder; Klaus Dilger. Influence of Laser-Generated Cutting Edges on the Electrical Performance of Large Lithium-Ion Pouch Cells. Batteries 2019, 5, 73 .
AMA StyleTobias Jansen, Maja W. Kandula, Sven Hartwig, Louisa Hoffmann, Wolfgang Haselrieder, Klaus Dilger. Influence of Laser-Generated Cutting Edges on the Electrical Performance of Large Lithium-Ion Pouch Cells. Batteries. 2019; 5 (4):73.
Chicago/Turabian StyleTobias Jansen; Maja W. Kandula; Sven Hartwig; Louisa Hoffmann; Wolfgang Haselrieder; Klaus Dilger. 2019. "Influence of Laser-Generated Cutting Edges on the Electrical Performance of Large Lithium-Ion Pouch Cells." Batteries 5, no. 4: 73.
Due to the increasing demand for high-performance cells for mobile applications, the standards of the performance of active materials and the efficiency of cell production strategies are rising. One promising cell technology to fulfill the increasing requirements for actual and future applications are all solid-state batteries with pure lithium metal on the anode side. The outstanding electrochemical material advantages of lithium, with its high theoretical capacity of 3860 mAh/g and low density of 0.534 g/cm3, can only be taken advantage of in all solid-state batteries, since, in conventional liquid electrochemical systems, the lithium dissolves with each discharging cycle. Apart from the current low stability of all solid-state separators, challenges lie in the general processing, as well as the handling and separation, of lithium metal foils. Unfortunately, lithium metal anodes cannot be separated by conventional die cutting processes in large quantities. Due to its adhesive properties and toughness, mechanical cutting tools require intensive cleaning after each cut. The presented experiments show that remote laser cutting, as a contactless and wear-free method, has the potential to separate anodes in large numbers with high-quality cutting edges.
Tobias Jansen; David Blass; Sven Hartwig; Klaus Dilger. Processing of Advanced Battery Materials—Laser Cutting of Pure Lithium Metal Foils. Batteries 2018, 4, 37 .
AMA StyleTobias Jansen, David Blass, Sven Hartwig, Klaus Dilger. Processing of Advanced Battery Materials—Laser Cutting of Pure Lithium Metal Foils. Batteries. 2018; 4 (3):37.
Chicago/Turabian StyleTobias Jansen; David Blass; Sven Hartwig; Klaus Dilger. 2018. "Processing of Advanced Battery Materials—Laser Cutting of Pure Lithium Metal Foils." Batteries 4, no. 3: 37.