LiCoO2 and LiCo1-xAlxO2 Thin Film Cathodes Grown by Pulsed Laser Ablation

J. D. Perkins, C. S. Bahn, P. A. Parilla, J. M. McGraw, M. L. Fu, M. Duncan, H. Yu, D. S. Ginley

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LiCoO2 and LiCo0.5Al0.5O2 thin films have been grown by pulsed laser ablation on SnO2-coated glass substrates. For both stoichiometries, the resultant films are dense and uniaxially textured films with the Li and Co layers parallel to the substrate. In general, to grow LiCo0.5Al0.5O2 films, a laser flux roughly 80 mJ pulse-1 higher than that used for LiCoO2 films is required to achieve a similar deposition rate. LiCoO2 films grown at Ts = 600°C and p[O2] = 2000 mTorr have a typical grain size of ∼ 100 nm. For constant current cycling between 3.8 and 4.2 V at 5 μ A, the LiCoO2 films have an initial discharge capacity of ∼ 0.33 Li per LiCoO2 (89 (mA h) g-1) decreasing to ∼ 0.18 Li/LiCoO2 (49 (mA h) g-1) after 100 cycles and have a continued capacity loss of ∼ 0.25% per cycle. The LiCo0.5Al0.5O2 films grown to date have roughly 3 times less capacity than the LiCoO2 films and apparently a large asymmetry between Li extraction and reintercalation.

Original languageAmerican English
Pages (from-to)675-679
Number of pages5
JournalJournal of Power Sources
StatePublished - 1999
EventProceedings of the 1998 Ninth International Meeting on Lithium Batteries - Edingburgh, United Kingdom
Duration: 12 Jul 199817 Jul 1998

NREL Publication Number

  • NREL/JA-520-27881


  • Li-ion batteries
  • LiCoA1O
  • LiCoO
  • Thin film cathodes


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