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http://dx.doi.org/10.4191/KCERS.2004.41.1.086

Structural and Electrochemical characterization of LiCoO2 Nano Cathode Powder Fabricated by Mechanochemical Process  

Choi, Sun-Hee (Nano-Materials Research Center, Korea Institute of Science and Technology)
Kim, Joo-Sun (Nano-Materials Research Center, Korea Institute of Science and Technology)
Yoon, Young-Soo (Department of Advanced Fusion Technology, Kunkuk University)
Publication Information
Journal of the Korean Ceramic Society / v.41, no.1, 2004 , pp. 86-91 More about this Journal
Abstract
$LiCoO_2$ cathode powders with round particle shaped and nano grain sized of 70-300nm were synthesized by a mechanochemical method. The surface of Li-Co precursor prepared by freeze drying method was modified by $K_2SO_4$ coating and ball milling was used for the coating process. The precursor was crystallized to high temperature form of $LiCoO_2$ at $800^{\circ}C$ and the grain growth was inhibited by the $K_2SO_4$ coating effect. The $K_2SO_4$ coating was not decomposed at $800^{\circ}C$ and prevented the contact in the Li-Co precursor particles. The nano-sized $LiCoO_2$ powder had tetragonal phase and it affected the Li diffusion through the surface of particles. It means that the anode materials for hight performance battery should be satisfied not only small particle size but phase contol on the surface of particles. In this study, the powder characteristics and rate capabilities were compared with a commercial powder and the nano-sized $LiCoO_2$ powder fabricated by the mechanochemical method. And the crucial factor which affects on battery performance was also examined.
Keywords
Mechanochemical method; Surface modification; Nano $LiCoO_2$ powder; Grain size; High power density; High discharge rate;
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