期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 506, 期 1, 页码 317-322出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.06.199
关键词
Silicon-based anode; Si-Ti alloys; Glassy matrix; HEMM; Li-ion batteries
资金
- NSFC [20333040, 50672114]
- 863 Project of China [2006AA03Z232]
- 973 Project of China [2007CB209700]
- Science and Technology Commission of Shanghai Municipality [08DZ2210900]
A nanosized silicon based composite consisting of Si, Si-Ti alloy phases dispersed in a glassy matrix is prepared by high energy mechanical milling (HEMM), followed by thermal treatment. X-ray diffraction (XRD), field emission scanning electron microscope (SEM) and transmission electron microscope (TEM) are used to determine the phases obtained and to observe the microstructure and distribution of the components. The galvanostatic discharge/charge test is carried out to characterize the electrochemical properties of the composite. The composite electrode delivered a reversible capacity of 738.6 mAh g(-1) after 50 cycles and the coulombic efficiency remains above 95% from the 3rd cycle. When the discharge capacity is limited to 700 mAh g(-1), the reversible capacity is maintained at 675.8 mAh g(-1) for 60 cycles without overcharge. (C) 2010 Elsevier B.V. All rights reserved.
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