Abstract
LiCoO2 thin film cathodes were prepared by RF magnetron sputtering and post-annealing. The surface morphological change of the LiCoO2 thin film wasin-situ measured by hot stage SEM with increasing temperature. The effects of sputtering gas pressure and post-annealing at low temperature (400 °C) were investigated by XRD, AFM, ICP-AES and RBS. The electrochemical characteristics of LiCoO2 thin films were changed with variation of sputtering gas pressure. A difference of micro-structural evolution after post-annealing was observed, which related to the thin film properties. The electrochemical analysis revealed that the optimal sputtering gas pressure with the low temperature annealing step increases cell capacity and rate capability.
Similar content being viewed by others
References
Antaya, M., Cearns, K., Preston, J. S., Reimers, J. N. and Dahn, J. R., “In situ growth of layered, spinel, and rock-salt LiCoO2 by laser ablation deposition,”J. Appl. Phys.,76, 2799 (1994).
Antaya, M., Dahn, J. R., Preston, J. S., Rossen, E. and Reimers, J. N., “Preparation and characterization of LiCoO2 thin films by laser ablation deposition,”J. Electrochem. Soc.,140, 575 (1993).
Bates, J. B., Dudney, N. J., Neudecker, B. J., Hart, F. X., Jun, H. P. and Hackney, S. A., “Preferred orientation of polycrystalline LiCoO2 films,”J. Electrochem. Soc.,147, 59 (2000).
Bates, J. B., Dudney, N. J., Neudecker, B., Ueda, A. and Evans, C. D., “Thin-film lithium and lithium ion batteries,”Solid State Ionics,135, 33 (2000).
Bates, J. B., Gruzalski, G. R., Dudney, N. J., Luck, C. F., Yu, X.-H. and Jones, S. D., “Rechargeable thin-film lithium microbatteries,”Solid State Technol.,36, 59 (1993).
Benqlilou-Moudden, H., Blondiaux, G., Vinatier, P. and Levasseur, A., “Amorphous lithium cobalt and nickel oxides thin films: preparation and characterization by RBS and PIGE,”Thin Solid Films,333, 16 (1998).
Bhat, M. H., Chakravarthy, B. P., Ramakrishnan, P. A., Levasseur, A. and Rao, K. J., “Microwave synthesis of electrode materials for lithium batteries,”Bull. Mater. Sci.,23, 461 (2000).
Bouwman, P. J., Boukamp, B. A., Bouwmeester, H. J. M., Wondergem, H. J. and Notten, P. H. L., “Structural analysis of submicrometer LiCoO2 films,”J. Electrochem. Soc.,148, A311 (2001).
Fragnaud, P., Brousse, T. and Schleich, D. M., “Characterization of sprayed and sputter deposited LiCoO2 thin films for rechargeable microbatteries,”J. Power Sources,63, 187 (1996).
Lee, L. K., Lee, S. J., Baik, H. K., Lee, H. Y., Jang, S. W. and Lee, S. M., “Substrate effect on the microstructure and electrochemical properties in the deposition of a thin film LiCoO2 electrode,”Electrochem. Solid-state Lett.,2, 512 (1999).
Lee, S. J., Lee, J. K., Kim, D. W. and Baik, H. K., “Fabrication of thin film LiCo0.5Ni0.5O2 cathode for Li rechargeable microbattery,”J. Electrochem. Soc.,143, L268 (1996).
Polo da Fonseca, C. N., Davalos, J., Kleinke, M., Frantini, M. C. A. and Gorenstein, A., “Studies of LiCoO2 thin film cathodes produced by r.f. sputtering,”J. Power Sources,81–82, 575 (1999).
Rossen, E., Reimers, J. N. and Dahn, J. R., “Synthesis and electrochemistry of spinel LT-LiCoO2,”Solid State Ionics,62, 53 (1993).
Song, S. W., Han, K. S. and Yoshimura, M., “Effect of 20–200‡C fabrication temperature on microstructure of hydrothermally prepared LiCoO2 films,”J. Am. Ceram. Soc.,83, 2839 (2000).
Striebel, K. A., Deng, C. Z., Wen, S. J. and Cairns, E. J., “Electrochemical behavior of LiMn2O4 and LiCoO2 thin films produced with pulsed laser deposition,”J. Electrochem. Soc.,143, 1821 (1996).
Wang, B., Bates, J. B., Hart, F. X., Sales, B. C., Zuhr, R. A. and Robertson, J. D., “Characterization of thin-film rechargeable lithium batteries with lithium cobalt oxide cathodes,”J. Electrochem. Soc.,143, 3203 (1996).
Whitacre, J. F., West, W. C. and Ratnakumar, B. V., “The influence of target history and deposition geometry on RF magnetron sputtered LiCoO2 thin films,”J. Power Sources,103, 134 (2001).
Whitacre, J. F., West, W. C., Brandon, E. and Ratnakumar, B. V., “Crystallographically oriented thin-film nanocrystalline cathode layers prepared without exceeding 300 ‡C,”J. Electrochem. Soc.,148, A1078 (2001).
Yan, H., Huang, X., Li, H. and Chen, L., “Electrochemical study on LiCoO2 synthesized by microwave energy,”Solid State Ionics,113–115, 11 (1998).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Park, H.Y., Nam, S.C., Lim, Y.C. et al. Influence of sputtering gas pressure on the LiCoO2 thin film cathode post-annealed at 400 °C. Korean J. Chem. Eng. 23, 832–837 (2006). https://doi.org/10.1007/BF02705936
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF02705936