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Growth of silicon/carbon microrods on graphite microspheres as improved anodes for lithium-ion batteries
| Content Provider | Semantic Scholar |
|---|---|
| Author | Zhu, Xiaoyi Chen Wang, Yanhong Xia, Linhua Tan, Qiangqiang Zhong, Ziyi Su, Fabing Zhao, Xiu Song |
| Copyright Year | 2013 |
| Abstract | We report a facile chemical vapor deposition (CVD) method to grow silicon/carbon (Si/C) microrods on the surface of commercial graphite microspheres (GMs) to prepare Si/C/GM composite materials as Li-ion battery anodes. Dimethyldichlorosilane and toluene were used as Si and C precursors, respectively. The CVD temperature and time, as well as the mechanism of materials growth were investigated. The samples were characterized by using X-ray diffraction, thermogravimetric analysis, X-ray photoelectron spectroscopy, Raman spectroscopy, scanning electron microscopy, and transmission electron microscopy. It was found that the obtained Si/C/GM composites with an urchin-like morphology are composed of Si particles, amorphous carbon, and graphite. The CVD conditions have a significant impact on the morphology and electrochemical performance of the composite materials. The composite prepared under the optimum CVD conditions, namely at 900 degrees C for 5 h, displayed the best anode properties with a specific capacity of 562.0 mA h g(-1) at a current density of 50 mA g(-1), much higher than that of GMs (361.0 mA h g(-1)), and a good cycling performance (i. e., a reversible capacity of 590.5 mA h g(-1) after 50 cycles). The improved electrochemical performance is attributed to the incorporation of Si, together with the formation of a Si/C microrod network, which connects the GMs and buffers the volume change of Si during lithium ion insertion/extraction. The work provides a simple and low-cost route to enhance the performance of commercial graphite anode materials for Li-ion batteries. |
| Starting Page | 4483 |
| Ending Page | 4489 |
| Page Count | 7 |
| File Format | PDF HTM / HTML |
| Volume Number | 1 |
| Alternate Webpage(s) | http://www.rsc.org/suppdata/ta/c3/c3ta01474f/c3ta01474f.pdf |
| Alternate Webpage(s) | https://doi.org/10.1039/c3ta01474f |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
