期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 116, 期 2-3, 页码 383-387出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2009.05.041
关键词
Lithium ion battery; Anode; Composites; Core-shell structure
资金
- Guangdong Natural Science Foundation [8452840301001692]
- Scientific Research Starting Foundation of University of Electronic Science and Technology of China Zhongshan Institute [2007YKQ16]
- Youth Foundation of University of Electronic Science and Technology of China Zhongshan Institute [407YJ01]
The Co3O4 coated Al composites with different Co3O4 content were synthesized by a theological phase reaction in combination with a following heat-treatment process. The composites were characterized by X-ray powder diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, galvanostatic cycling and ac impedance spectroscopy. Results revealed that Al matrix is coated by Co3O4 nanoparticles to form a core-shell structure. The composites exhibit improved cycle performance than pure Al particles. After ten cycles, the capacity retentions of Al-1 wt.% Co3O4, Al-3 wt.% Co3O4 and Al-5 wt.% Co3O4 are 66.8, 69.9 and 70.1% respectively, which are much higher than that of pure aluminum (42%). The improvement of cycle performance is related to the formation of core-shell structure, which plays important roles in the enhancement of mechanical stability and the reinforcement of electronic contact. (C) 2009 Elsevier B.V. All rights reserved.
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