期刊
JOURNAL OF POWER SOURCES
卷 251, 期 -, 页码 85-91出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.11.030
关键词
alpha-Fe2O3 nanorods; Carbon nanofibers; Preparation; Anode materials; Lithium-ion batteries
资金
- National Natural Science Foundation of China
- Natural Science Foundation of Guangdong Province [U1134002]
- Natural Science Fund of Guangdong Province [10351063101000001]
- Guangdong Province [2012B091100332]
- Ministry of Education for the Cooperation among Industries, Universities and Institutes [2012B091100332]
A novel Fe2O3/carbon composite is prepared using a facile one-step hydrothermal method. Its structure, morphology and performance as anode of lithium ion battery are investigated with X-ray diffraction, scanning electron microscopy, thermogravimetry, cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy. It is found that the as-prepared composite is composed of alpha-Fe2O3 nanorods of about 75 nm in diameter and 1 mu m in length, which are enwrapped with soft and curly carbon nanofibers, and exhibits superior charge/discharge performance compared to bare alpha-Fe2O3 nanorods, especially at high current rate. The discharge capacity is 1069 mAh g(-1) at the first cycle and remains 560 mAh g(-1) after 30 cycles at 0.2C for the bare nanorods, but improved to 1278 mAh g(-1) and 960 mAh g(-1) for the composite. At 12C, the discharge capacity is only 798 mAh g(-1) initially and becomes 98 mAh g(-1) after 30 cycles for the bare nanorods, while 844 mAh g(-1) and 292 mAh g(-1) for the composite. The improved performance of the composite is attributed to the bondage from carbon nanofibers, which contributes to the improvement in electronic conductivity and structure stability of alpha-Fe2O3 nanorods. (C) 2013 Elsevier B.V. All rights reserved.
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