17 February 2017 Investigation of micro-structured Li(Ni1/3Mn1/3Co1/3)O2 cathodes by laser-induced breakdown spectroscopy
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Abstract
Lithium nickel manganese cobalt oxide (Li(Ni1/3Mn1/3Co1/3)O2, NMC) thick film electrodes were manufactured by using the doctor-blade technique (tape-casting). Ultrafast laser-structuring was performed in order to improve the electrochemical performance. For this purpose, three-dimensional (3D) micro-structures such as free standing micropillars were generated in NMC cathodes by using femtosecond laser ablation. Laser-induced breakdown spectroscopy (LIBS) was used for post-mortem investigation of the lithium distribution of unstructured and femtosecond laser-structured NMC electrodes. For achieving a variable State-of-Health (SoH), both types of electrodes were electrochemically cycled. LIBS calibration was performed based on NMC electrodes with defined lithium amount. Those samples were produced by titration technique in a voltage window of 3.0 V - 5.0 V. Elemental mapping and elemental depth-profiling of lithium with a lateral resolution of 100 μm were applied in order to characterize the whole electrode surface. The main goal is to develop an optimized 3D cell design with improved electrochemical properties which can be correlated to a characteristic lithium distribution along 3D micro-structures at different SoH.
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P. Smyrek, P. Smyrek, Y. Zheng, Y. Zheng, J.-H. Rakebrandt, J.-H. Rakebrandt, H. J. Seifert, H. J. Seifert, W. Pfleging, W. Pfleging, } "Investigation of micro-structured Li(Ni1/3Mn1/3Co1/3)O2 cathodes by laser-induced breakdown spectroscopy", Proc. SPIE 10092, Laser-based Micro- and Nanoprocessing XI, 100920S (17 February 2017); doi: 10.1117/12.2253894; https://doi.org/10.1117/12.2253894
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