期刊
NANO ENERGY
卷 11, 期 -, 页码 490-499出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2014.11.031
关键词
Lithium ion batteries; Micro-sized; Si/C; Anode; Hierarchical structure
类别
资金
- Strategic Priority Research Program of the Chinese Project Academy of Science [XDA01020304]
- National Natural Science Foundation of China [51371186]
- Zhejiang Province Preferential Postdoctoral Funded Project [BSH1302055]
- Ningbo 3315 International Team of Advanced Energy Storage Materials
- Ningbo Natural Science Foundation [2014A610046]
- Zhejiang Province Key Science and Technology Innovation Team [2013PT16]
The unique micro-sized (2-10 mu m) Si/C composites consisting of 20 nm carbon coated secondary Si were synthesized from the abundant and low cost Al-Si alloy ingot by acid etching, ball-milling and carbonization procedure. The nano-porous Si/C composites provide a capacity of 1182 mAh g(-1) at a current density of 50 mAg(-1), 952 mAh g(-1) at 200 mAg(-1), 815 mAh g(-1) at 500 mAg(-1), and maintain 86.8% of initial capacity after 300 cycles. Even at a much higher current density of 10 A/g, the porous Si/C anode can still provide capacities of >200 mAh g(-1). Its superior rate capability and cycling stability of micro-sized nano-porous Si/C anodes is because it takes advantage of both long cycle life of nano-Si and high volumetric/gravimetric capacity of micro-Si. The hierarchical porous micro-scale Si/C with the carbon coating can stabilize the SEI layer and the inside pore provides adequate space for Si expansion, relaxing the stress/strain. The hierarchical Si/C with exceptional electrochemical performance is prepared by a simple, low-cost and saleable synthesis method, making it very promising for a large-scale production of high-performance Si-based anode materials in high-energy lithium-ion batteries. (C) 2014 Elsevier Ltd. All rights reserved.
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