期刊
APPLIED SURFACE SCIENCE
卷 258, 期 16, 页码 5938-5942出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2011.11.018
关键词
Lithium-ion battery; Graphite; MCMB; Li4Ti5O12
类别
资金
- National Science Council of Taiwan [NSC 98-2221-E-034-007-MY2]
In this study, we have synthesized and characterized Li4Ti5O12 (LTO)-coated meso-carbon micro beads (MCMB) as an anode material for Li-batteries. The surface of MCMB powders was uniformly coated by the LTO nanoparticles to form a core-shell structure via a sol-gel process, followed by calcination. The average size of MCMB core was 20 mu m while the thickness of LTO shell was 80-120 nm. We found that LTO-coated MCMB has better rate-capability and cycle life, compared with the pristine MCMB. Electrochemical impedance spectroscopy (EIS) results showed that after 40 cycles, the cell resistance of the LTO-coated MCMB electrode increased slightly, while that of the pristine MCMB electrode increased significantly. The enhanced performance of the LTO-coated MCMB electrode is attributed to the LTO coating, which suppresses the increase in the charge-transfer resistance during prolonged cycle. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.
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