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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 19, Number 1
BKCSDE 19(1)
January 20, 1998 

Cathodic Properties of LiCoO2 Synthesized by a Sol-Gel Method for Lithium Ion Battery
Pong-Jun Cho, Euh-Duck Jeong, Yoon-Bo Shim*
LiCoO2 powder was synthesized in an aqueous solution by a sol-gel method and used as a cathode active material for a lithium ion rechargeable battery. The layered LiCoO2 powders were prepared by igniting in air for 12 hrs at 600 ℃ (600-LiCoO2) and 850 ℃ (850-LiCoO2). The structure of the LiCoO2 powder was assigned to the space group R bar 3 m (lattice parameters a=2.814 Å and c=14.04Å). The SEM pictures of 600-LiCoO2 revealed homogeneous and fine particles of about 1 μm in diameter. Cyclic voltammograms (CVs) of 600-LiCoO2 electrode displayed a set of redox peaks at 3.80/4.05 V due to the intercalation/deintercalation of the lithium ions into/out of the LiCoO2 structure. CVs for the 850-LiCoO2 electrode had a major set of redox peaks at 3.88/4.13 V, and two small set of redox peaks at 4.18/4.42 V and 4.05/4.25 V due to phase transitions. The initial charge-discharge capacity was 156-132 mAh/g for the 600-LiCoO2 electrode and 158-131 mAh/g for the 850-LiCoO2 electrode at the current density of 0.2 mA/cm2. The cycleability of the cell consisting of the 600-LiCoO2 electrode was better than that of the 850-LiCoO2. The diffusion coefficient of the Li+ ion in the 600-LiCoO2 electrode was calculated as 4.6×10-8 cm2/sec.
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