期刊
JOURNAL OF POWER SOURCES
卷 248, 期 -, 页码 721-728出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.10.012
关键词
Lithium-ion battery; Anode material; Silicon/graphite/amorphous carbon; composite; Spray drying
资金
- National Science Foundation of China (NSFC) [51201066, 51171065]
- Natural Science Foundation of Guangdong Province [S2012020010937, 10351063101000001]
- Foundation for Distinguished Young Talents in Higher Education of Guangdong [2012LYM_0048]
A silicon/graphite/amorphous carbon (Si/C) composite with a low silicon content in a core shell structure has been easily synthesized using a simple method based on spray drying in combination with a subsequent pyrolysis process; natural graphite serves as the core, and silicon nanoparticles, which filled in the porous carbon matrix formed from the pyrolysis of citric acid and pitch precursors, serve as the shell. The combination of the core shell structure for the composite and porous carbon-coating layer accommodates the large volume change of the silicon during the lithium intercalation/extraction process, thus stabilizing the electrode structure during discharge/charge cycles. As an anode material, the asobtained Si/C composite demonstrates high capacity and excellent cycle stability. An initial specific discharge capacity of approximately 723.8 mAh g(-1), and a reversible specific capacity of approximately 600 mAh g(-1) after 100 cycles at a constant density of 100 mA g(-1) are reached, about two times the values for graphite. Due to the simple synthesis process and the excellent performance of the resulted electrode, great commercial potential is envisioned. (c) 2013 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据