A graphene-wrapped silver-porous silicon composite with enhanced electrochemical performance for lithium-ion batteries

被引:68
作者
Du, Fei-Hu [1 ]
Wang, Kai-Xue [1 ]
Fu, Wei [1 ]
Gao, Peng-Fei [1 ]
Wang, Jing-Feng [1 ]
Yang, Jun [1 ]
Chen, Jie-Sheng [1 ]
机构
[1] Shanghai Jiao Tong Univ, Sch Chem & Chem Engn, Shanghai 200240, Peoples R China
关键词
ANODE MATERIALS; NANOPARTICLES; STORAGE; PARTICLES; NANOWIRES; NANOCOMPOSITE; ELECTRODES; LITHIATION; TEMPLATE; SHEETS;
D O I
10.1039/c3ta13092d
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A graphene-wrapped silver-porous silicon composite has been prepared and used as the anode material in lithium-ion batteries (LIBs). Porous silicon (pSi) prepared through a magnesiothermic reduction of mesoporous silica MCM-41 was surface-modified by Ag nanoparticles formed via the thermal decomposition of AgNO3 and then graphene nanosheets (GNS) generated through the thermal reduction of graphene oxide. The obtained Ag-pSi/GNS composite exhibits a distinctly high reversible specific capacity, long cycling performance and super rate capability. An initial capacity as high as 3531 mA h g(-1) is delivered at 0.1 A g(-1), whereas at a current density of 32 A g(-1), a specific capacity of 1241 mA h g(-1), more than three times higher than the theoretical capacity of the graphite anode, is still retained for 50 cycles. The superior electrochemical performance demonstrates that this Ag-pSi/GNS composite is a promising electrode material for high-performance LIBs.
引用
收藏
页码:13648 / 13654
页数:7
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