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Patterning and annealing of nanocrystalline LiCoO2 thin films

R. KOHLER1,* , P. SMYREK1, S. ULRICH1, M. BRUNS2, V. TROUILLET2, W. PFLEGING1

Affiliation

  1. Institute for Materials Research (IMF-I), Karlsruhe Institute of Technology (KIT), P.O. Box 3640 Karlsruhe, Germany
  2. Institute for Materials Research (IMF-III), Karlsruhe Institute of Technology (KIT), P.O. Box 3640 Karlsruhe, Germany

Abstract

For the development of new high power density cathode materials for lithium ion batteries (LIB) the combination of thin film technology and laser technology is investigated. For this purpose thin films of lithium cobalt oxide (LiCoO2) synthesized by r.f. magnetron sputtering were structured with laser radiation to significantly increase the active surface area. Subsequent heat treatment using laser annealing was performed in order to synthesize the required high temperature phase of LiCoO2. The cathode material was studied by Raman spectroscopy to determine the structure before and after laser treatment. Xray photoelectron spectroscopy was applied to determine the chemical composition of the films. The battery performance of laser treated cathode material was investigated by means of electrochemical cycling. A significant improvement of capacity retention by laser structuring was detected..

Keywords

Lithium ion batteries, Laser structuring, Laser annealing, Thin film technology, LiCoO2.

Submitted at: June 21, 2009
Accepted at: Feb. 27, 2010

Citation

R. KOHLER, P. SMYREK, S. ULRICH, M. BRUNS, V. TROUILLET, W. PFLEGING, Patterning and annealing of nanocrystalline LiCoO2 thin films, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 3, pp. 547-552 (2010)