6 March 2014 Fs-laser microstructuring of laser-printed LiMn2O4 electrodes for manufacturing of 3D microbatteries
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Abstract
Lithium manganese oxide composite cathodes are realized by laser-printing. The printed cathode is a composite and consists of active powder, binder and conductive agents. Laser-printed cathodes are first calendered and then laser structured using femtosecond-laser radiation in order to form three-dimensional (3D) micro-grids in the cathode material. Three-dimensional micro-grids in calendered/laser structured cathodes exhibit improved discharge capacity retention at a 1 C discharging rate. Calendered but unstructured cathodes indicate the poorest cycling behavior at 1 C discharge. The improved capacity retention and the reduced degradation of calendered/structured cathodes can be attributed to both the increased electrical contact through calendering as well as shortened Li-ion pathways due to laser-induced 3D microgrids.
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J. Pröll, H. Kim, M. Mangang, H. J. Seifert, A. Piqué, W. Pfleging, "Fs-laser microstructuring of laser-printed LiMn2O4 electrodes for manufacturing of 3D microbatteries", Proc. SPIE 8968, Laser-based Micro- and Nanoprocessing VIII, 896805 (6 March 2014); doi: 10.1117/12.2039902; https://doi.org/10.1117/12.2039902
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