期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 3, 期 5, 页码 2399-2406出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta06113f
关键词
-
资金
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-SC0005397]
Micro-sized carbon-coated Si-based composites have been developed by a simple mechanochemical reaction between SiO, Ni, and Al, followed by an additional milling process with graphite. The resultant carbon-coated Si-based composite exhibits a reversible capacity of over 580 mA h g(-1) after 200 cycles with a considerably higher tap density of similar to 1.34 g cm(-3) compared to nanosized Si (similar to 0.16 g cm(-3)). The improvement in the electrochemical performance is achieved due to both highly conductive NiSi2 nanoinclusions and amorphous Al2O3 buffer matrix in the composite. Upon cycling, the multifunctional NiSi2 phase not only provides enhanced electronic conductivity but also suppresses the formation of crystalline Li15Si4 that causes an inhomogeneous volume change. Simultaneously, amorphous Al2O3 plays a crucial role in maintaining particle connectivity by impeding the agglomeration of active Si nanocrystallites. The combination of these advantages with a low-cost, scalable, and environmentally benign synthetic process make the Si-based composite a promising alternative anode for high performance Li-ion batteries.
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