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Synthesis and electrochemical properties of LiCoO2 powders by ureahydrolysis

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2004, 14(6), pp.267~271
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering
  • Received : September 21, 2004
  • Accepted : November 3, 2004

Yong Hee Jung 1,  Ungyu Paik 1,  Kui Won Kang 1,  Hun Cheong 2,  Kwang Taek Hwang 2

1한양대학교
2요업기술원

Accredited

ABSTRACT

Lithium cobalt oxide (LiCoO2) cathode powders for rechargeable battery have been successfully prepared using urea hydrolysis method. The obtained hydrolysis-derived precursors with different Li/Co molar ratio were calcined at various temperatures. Low temperature phase (LT-LiCoO2) and high temperature phase (HT-LiCoO2) were obtained after calcination at 500oC for 2 hr, and phase transformation from LT-LiCoO2 to HT-LiCoO2 was completely occurred over 700oC. The layered structure of LiCoO2 was well developed with a rise in the calcination temperature. Charge-discharge test show that the lithium cobalt oxide with 1.2 molar ratio prepared at 800oC has an initial discharge capacity as high as 152 mAh/g, and the relatively stable cycling characteristic with 9.2 % of capacity fading was obtained after 40th charge-discharge test.

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