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Proceedings Paper

Laser-adjusted three-dimensional Li-Mn-O cathode architectures for secondary lithium-ion cells
Author(s): J. Pröll; R. Kohler; M. Torge; M. Bruns; M. Przybylski; S. Ulrich; H. J. Seifert; W. Pfleging
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Paper Abstract

Three-dimensional cathode architectures for rechargeable lithium-ion cells can provide better Li-ion diffusion due to larger electrochemical active surface area and therefore, may stabilize the cycling behaviour of an electrochemical cell. This features show great importance when aiming for long-life batteries, e.g. in stationary or portable power devices. In this study, lithium manganese oxide thin films were used as cathode material with the goal to stabilize their cycling behavior and to counter degradation effects which come up within the lithium manganese oxide system. Firstly, appropriate laser ablation parameters were selected in order to achieve defined three-dimensional structures with features sizes down to micro- and sub-micrometer scale by using mask imaging technique. Laser annealing was also applied onto the laser structured material in a second step in order to form an electrochemically active phase. Process development led to a laser annealing strategy for a flexible adjustment of crystallinity and grain size. Laser annealing was realized using a high power diode laser system operating at a wavelength of 940 nm. Information on the surface composition, chemistry and topography as well as studies on the crystalline phase of the material were obtained by using Raman spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy and X-ray diffraction analysis. The electrochemical activity of the laser modified lithium manganese oxide cathodes was explored by cyclic voltammetry measurements and galvanostatic testing by using a lithium anode and standard liquid electrolyte.

Paper Details

Date Published: 17 February 2012
PDF: 10 pages
Proc. SPIE 8244, Laser-based Micro- and Nanopackaging and Assembly VI, 82440S (17 February 2012); doi: 10.1117/12.906714
Show Author Affiliations
J. Pröll, Karlsruhe Institute of Technology (Germany)
R. Kohler, Karlsruhe Institute of Technology (Germany)
M. Torge, Karlsruhe Institute of Technology (Germany)
M. Bruns, Karlsruhe Institute of Technology (Germany)
M. Przybylski, ATL Lasertechnik GmbH (Germany)
S. Ulrich, Karlsruhe Institute of Technology (Germany)
H. J. Seifert, Karlsruhe Institute of Technology (Germany)
W. Pfleging, Karlsruhe Institute of Technology (Germany)
Karlsruhe Nano Micro Facility (Germany)

Published in SPIE Proceedings Vol. 8244:
Laser-based Micro- and Nanopackaging and Assembly VI
Friedrich G. Bachmann; Wilhelm Pfleging; Kunihiko Washio; Jun Amako; Willem Hoving; Yongfeng Lu, Editor(s)

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