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Proceedings Paper

Laser annealing of textured thin film cathode material for lithium ion batteries
Author(s): R. Kohler; M. Bruns; P. Smyrek; S. Ulrich; M. Przybylski; W. Pfleging
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Paper Abstract

The material development for advanced lithium ion batteries plays an important role in future mobile applications and energy storage systems. It is assumed that electrode materials made of nano-composited materials will improve battery lifetime and will lead to an enhancement of lithium diffusion and thus improve battery capacity and cyclability. Lithium cobalt oxide (LiCoO2) is commonly used as a cathode material. Thin films of this electrode material were synthesized by non-reactive r.f. magnetron sputtering of LiCoO2 targets on silicon or stainless steel substrates. For the formation of the high temperature phase of LiCoO2 (HT-LiCoO2), which exhibits good electrochemical performance with a specific capacity of 140 mAh/g and high capacity retention, a subsequent annealing treatment is necessary. For this purpose laser annealing of thin film LiCoO2 was investigated in detail and compared to conventional furnace annealing. A high power diode laser system operating at a wavelength of 940 nm with an integrated pyrometer for temperature control was used. Different temperatures (between 200°C and 700°C) for the laser structured and unstructured thin films were applied. The effects of laser treatment on the LiCoO2 thin films studied with Raman spectroscopy, X-ray photoelectron spectroscopy and X-ray diffraction to determine their stoichiometry and crystallinity. The development of HT-LiCoO2 and also the formation of a Co3O4 phase were discussed. The electrochemical properties of the manufactured films were investigated via electrochemical cycling against a lithium anode.

Paper Details

Date Published: 23 February 2010
PDF: 11 pages
Proc. SPIE 7585, Laser-based Micro- and Nanopackaging and Assembly IV, 75850O (23 February 2010); doi: 10.1117/12.841259
Show Author Affiliations
R. Kohler, Karlsruhe Institute of Technology (Germany)
M. Bruns, Karlsruhe Institute of Technology (Germany)
P. Smyrek, Karlsruhe Institute of Technology (Germany)
S. Ulrich, Karlsruhe Institute of Technology (Germany)
M. Przybylski, ATL Lasertechnik GmbH (Germany)
W. Pfleging, Karlsruhe Institute of Technology (Germany)

Published in SPIE Proceedings Vol. 7585:
Laser-based Micro- and Nanopackaging and Assembly IV
Wilhelm Pfleging; Yongfeng Lu; Kunihiko Washio; Jun Amako; Willem Hoving, Editor(s)

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