Synthetic optimization of spherical LiCoO2 and precursor via uniform-phase precipitation

Ping He, Haoran Wang, Lu Qi, Tetsuya Osaka

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

LiCoO2 had been successfully prepared from spherical basic cobalt carbonate via a simple uniform-phase precipitation method at normal pressure, using cobalt sulfate and urea as the reactants. The preparation of spherical basic cobalt carbonate was significantly dependant on synthetic condition, such as the reactant concentration, reaction temperature and impeller speed, etc. The optimized condition resulted in spherical basic cobalt carbonate with uniform particle size distribution, as observed by scanning electron microscopy. Calcination of the uniform basic cobalt carbonate with lithium carbonate at high temperature led to a well-ordered layer-structured LiCoO2 without shape change, as confirmed by X-ray diffraction. Due to the homogeneity of the basic cobalt carbonate, the final product, LiCoO2, was also significantly uniform, i.e., the average particle size was of about 10 μm in diameter and the distribution was relatively narrow. As a result, the corresponding tap-density was also high approximately 2.60 g cm-3, of which the value is higher than that of commercialized LiCoO2 of Hunan Ruixing, co. In the voltage range 2.8-4.2, 2.8-4.3, and 2.8-4.4 V, the discharge capacities of LiCoO2 electrode were 153, 159, and 168 mAh g-1, respectively, with better cyclability.

Original languageEnglish
Pages (from-to)529-534
Number of pages6
JournalJournal of Power Sources
Volume158
Issue number1
DOIs
Publication statusPublished - 2006 Jul 14

Fingerprint

Carbonates
Cobalt
carbonates
cobalt
optimization
Lithium Carbonate
Particle size analysis
Calcination
taps
Urea
particle size distribution
ureas
roasting
homogeneity
Particle size
sulfates
Lithium
lithium
X ray diffraction
Temperature

Keywords

  • Cathode material
  • High tap-density
  • Spherical

ASJC Scopus subject areas

  • Electrochemistry
  • Fuel Technology
  • Materials Chemistry
  • Energy (miscellaneous)

Cite this

Synthetic optimization of spherical LiCoO2 and precursor via uniform-phase precipitation. / He, Ping; Wang, Haoran; Qi, Lu; Osaka, Tetsuya.

In: Journal of Power Sources, Vol. 158, No. 1, 14.07.2006, p. 529-534.

Research output: Contribution to journalArticle

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