| 기계 화학법에 의해 제작된 나노 LiCoO2 양극 분말의 구조 및 전기화학적 특성 |
| 최선희, 김주선, 윤영수1 |
한국과학기술연구원 나노재료연구센터
1건국대학교 신기술융합과 |
| Structural and Electrochemical characterization of LiCoO2 Nano Cathode Powder Fabricated by Mechanochemical Process |
| Sun-Hee Choi, Joo-Sun Kim, Young-Soo Yoon1 |
Nano-Materials Research Center, Korea Institute of Science and Technology
1Department of Advanced Fusion Technology, Kunkuk University |
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| ABSTRACT |
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$LiCoO_2$ 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. |
| Key words:
Mechanochemical method, Surface modification, Nano $LiCoO_2$ powder, Grain size, High power density, High discharge rate |
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