Journal
NANO LETTERS
Volume 15, Issue 9, Pages 5750-5754Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b01698
Keywords
lithium-ion battery; anode; Si nanoparticles; low grade; ferrosilicon; metallurgical Si
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Funding
- State Key Program for Basic Research of China [2015CB659300]
- National Natural Science Foundation of China (NSFC) [11321063]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Silicon, one of the most promising candidates as lithium-ion battery anode, has attracted much attention due to its high theoretical capacity, abundant existence, and mature infrastructure. Recently, Si nanostructures-based lithium-ion battery anode, with sophisticated structure designs and process development, has made significant progress. However, low cost and scalable processes to produce these Si nanostructures remained as a challenge, which limits the widespread applications. Herein, we demonstrate that Si nanoparticles with controlled size can be massively produced directly from low grade Si sources through a scalable high energy mechanical milling process. In addition, we systematically studied Si nanoparticles produced from two major low grade Si sources, metallurgical silicon (similar to 99 wt % Si, $1/kg) and ferrosilicon (similar to 433 wt % Si, $0.6/kg). It is found that nanoparticles produced from ferrosilicon sources contain FeSi2, which can serve as a buffer layer to alleviate the mechanical fractures of volume expansion, whereas nanoparticles from metallurgical Si sources have higher capacity and better kinetic properties because of higher purity and better electronic transport properties. Ferrosilicon nanoparticles and metallurgical Si nanoparticles demonstrate over 100 stable deep cycling after carbon coating with the reversible capacities of 1360 mAh g(-1) and 1205 mAh g(-1), respectively. Therefore, our approach provides a new strategy for cost-effective, energy-efficient, large scale synthesis of functional Si electrode materials.
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