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Title: Facile Fabrication of Porous Si Microspheres from Low-Cost Precursors for High-Capacity Electrode

Journal Article · · Advanced Materials Interfaces

Comparing with nanometer-sized Si (nano-Si), the micrometer-sized Si (micro-Si) is more promising for the practical applications due to its low cost and scalable production method. Fabrication of micro-Si with porous architecture can efficiently alleviate the high mechanical stress and severe mechanical fracture. Till now, it is still a challenge to achieve porous micro-Si with controlled morphology, such as microsphere, from a cost-efficient and environmentally friendly approach. Herein, a facile approach on fabricating Si microsphere with porous architecture via a low-temperature aluminothermic reduction (LTAR) method using the low-cost fumed silica (FS) as raw material is introduced. After compositing with graphite and then coating with amorphous carbon, the SiFS/graphite@carbon (SiFS/G@C) electrode displays superior reversible capacity (730 mAh g–1 after 100 cycles) and excellent rate capability (729.1 mAh g–1 at 1 A g–1). The electrochemical performance is much better than that of Si-microparticles/G@C (Mic-Si/G@C, 368 mAh g–1 at 100 mA g–1 after 100 cycles). These results show the great potential of SiFS/G@C electrode as an alternative high-performance electrode material for lithium ion batteries. Moreover, the LTAR adopted in the current study significantly reduces the energy consumption for preparation of Si microspheres from low-cost raw materials.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
China Ministry of Education (MOE); National Natural Science Foundation of China (NNSFC); Natural Science Foundation of Tianjin; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1761722
Journal Information:
Advanced Materials Interfaces, Journal Name: Advanced Materials Interfaces Journal Issue: 3 Vol. 7; ISSN 2196-7350
Publisher:
Wiley-VCHCopyright Statement
Country of Publication:
United States
Language:
English

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