期刊
ADVANCED ENERGY MATERIALS
卷 4, 期 16, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201400622
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资金
- Energy Efficiency & Resources project [20132020000270, 20112010100140]
- Human Resources Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korea government Ministry of Trade, Industry Energy (MOTIE) [20132020000270, 20124010203320]
- Korea Institute of Science and Technology (KIST) K-benefit program [2e24770]
- Center for Inorganic Photovoltaic Materials - Korea government (MEST) [2012-0001173]
- National Research Foundation of Korea - Korean Government (MEST) [NRF-2009-0094219]
- Ministry of Science, ICT & Future Planning, Republic of Korea [N01140050] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Council of Science & Technology (NST), Republic of Korea [2E24770] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2012-0001173] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Although magnesiothermic reduction has attracted immense attention as a facile route for the fabrication of mass-scale Si nanostructures for high-capacity lithium-ion battery applications, its low conversion yield (<50%) and the discovery of a sustainable and low-cost precursor remain challenging. Here, an unprecedentedly high final conversion yield (>98%) of magnesiothermic reduction based on control of reaction pressure is reported. The successful use of sand as a nearly infinite and extremely low-cost source for the high-yield fabrication of nanostructured Si electrodes for Li-ion batteries is demonstrated. On the basis of a step-by-step analysis of the material's structural, morphological, and compositional changes, a two-step conversion reaction mechanism is proposed that can clearly explain the phase behavior and the high conversion yield. The excellent charge-discharge performance (specific capacities over 1500 mAh g(-1) for 100 cycles) of the hierarchical Si nanostructure suggests that this facile, fast, and high-efficiency synthesis strategy from ultralow-cost sand particles provides outstanding cost-effectiveness and possible scalability for the commercialization of Si electrodes for energy-storage applications.
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