Laser annealing of textured thin film cathode material for lithium ion batteries

R. Kohler; M. Bruns; P. Smyrek; S. Ulrich; M. Przybylski; W. Pfleging

doi:10.1117/12.841259

23 February 2010 Laser annealing of textured thin film cathode material for lithium ion batteries

R. Kohler, M. Bruns, P. Smyrek, S. Ulrich, M. Przybylski, W. Pfleging

Proceedings Volume 7585, Laser-based Micro- and Nanopackaging and Assembly IV; 75850O (2010) https://doi.org/10.1117/12.841259
Event: SPIE LASE, 2010, San Francisco, California, United States

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.

Citation Download Citation

R. Kohler, M. Bruns, P. Smyrek, S. Ulrich, M. Przybylski, and W. Pfleging "Laser annealing of textured thin film cathode material for lithium ion batteries", Proc. SPIE 7585, Laser-based Micro- and Nanopackaging and Assembly IV, 75850O (23 February 2010); https://doi.org/10.1117/12.841259

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