15 March 2013 Laser-induced self-organizing surface structures on cathode materials for lithium-ion batteries
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Abstract
Rechargeable lithium-ion batteries have emerged as an attractive power source for a wide variety of applications, in particular for portable electronics. The development and modification of electrode materials is a major issue for the improvement of energy density and power density of lithium-ion batteries. For this purpose, laser-induced self-organizing surface structures were generated using UV-excimer laser radiation with a wavelength of 248 nm and a pulse width of 4-6 ns. The self-organization process was applied for thin films made of lithium cobalt oxide with a thickness of about 3 μm. In order to identify the chemical changes due to laser processing time-of-flight secondary ion mass spectroscopy measurements were performed. It was found that this process can be linked to a decomposition of the electrode material forming a lithium oxide surface layer. Similar self-organized surface structures could also be obtained for thick film electrode materials consisting of LiCoO2 powder mixed with binder and carbon black which were tape-casted onto aluminium foils. The thickness of these films was in the range of 50 - 100 μm.
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R. Kohler, R. Kohler, J. Pröll, J. Pröll, M. Bruns, M. Bruns, T. Scherer, T. Scherer, H. J. Seifert, H. J. Seifert, W. Pfleging, W. Pfleging, } "Laser-induced self-organizing surface structures on cathode materials for lithium-ion batteries", Proc. SPIE 8608, Laser-based Micro- and Nanopackaging and Assembly VII, 860806 (15 March 2013); doi: 10.1117/12.2006372; https://doi.org/10.1117/12.2006372
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