6 March 2014 Ultrafast laser microstructuring of LiFePO4 cathode material
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LiFePO4 is a very promising material to be used as positive electrode for future lithium-ion batteries. Nevertheless, a reduced rate capability at high discharging and charging currents is the main drawback. In this work, a 3D structure was made in LiFePO4 composite electrodes by applying ultrafast laser ablation. The change of the electrochemical properties in a lithium-ion half-cell due to laser structuring was studied in detail and will be discussed. The main challenging goal is to correlate cell properties such as capacity retention with laser parameters and laser generated microstructure. For microstructuring electrode materials an ultrafast as well as a ns fiber laser were used. The pulse duration was varied in the range from 350 fs to 200 ns. With ultrashort laser radiation, the ablation efficiency was increased. Electrochemical characterisations were performed. For this purpose, Swagelok® test cells with lithium metal as counter electrode were assembled. Main electrochemical parameters such as specific capacity and cycle stability were determined for the cells with structured and unstructured cathodes. It was shown that the rate capability for the cells with structured cathodes in comparison to cells with unstructured cathodes was significantly enhanced, especially for high charging and discharging rates.
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M. Mangang, M. Mangang, J. Pröll, J. Pröll, C. Tarde, C. Tarde, H. J. Seifert, H. J. Seifert, W. Pfleging, W. Pfleging, "Ultrafast laser microstructuring of LiFePO4 cathode material", Proc. SPIE 8968, Laser-based Micro- and Nanoprocessing VIII, 89680M (6 March 2014); doi: 10.1117/12.2039604; https://doi.org/10.1117/12.2039604

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